diff --git a/config.yml b/config.yml
index a760020e8..d6a3cdb6c 100644
--- a/config.yml
+++ b/config.yml
@@ -338,3 +338,11 @@ nodes:
       - name: prefix_location
       - name: skip_location
       - name: comment_location
+  - name: RBS::AST::Ruby::Annotations::ReturnTypeAnnotation
+    fields:
+      - name: location
+      - name: prefix_location
+      - name: return_location
+      - name: colon_location
+      - name: return_type
+      - name: comment_location
diff --git a/ext/rbs_extension/lexer.c b/ext/rbs_extension/lexer.c
index 82e530725..1a525657f 100644
--- a/ext/rbs_extension/lexer.c
+++ b/ext/rbs_extension/lexer.c
@@ -94,7 +94,6 @@ token rbsparser_next_token(lexstate *state) {
 		case 'k':
 		case 'l':
 		case 'q':
-		case 'r':
 		case 'w':
 		case 'x':
 		case 'y':
@@ -104,24 +103,25 @@ token rbsparser_next_token(lexstate *state) {
 		case 'n': goto yy56;
 		case 'o': goto yy57;
 		case 'p': goto yy58;
-		case 's': goto yy59;
-		case 't': goto yy60;
-		case 'u': goto yy61;
-		case 'v': goto yy62;
-		case '{': goto yy63;
-		case '|': goto yy64;
-		case '}': goto yy65;
+		case 'r': goto yy59;
+		case 's': goto yy60;
+		case 't': goto yy61;
+		case 'u': goto yy62;
+		case 'v': goto yy63;
+		case '{': goto yy64;
+		case '|': goto yy65;
+		case '}': goto yy66;
 		default: goto yy2;
 	}
 yy1:
 	rbs_skip(state);
-#line 147 "ext/rbs_extension/lexer.re"
+#line 148 "ext/rbs_extension/lexer.re"
 	{ return next_eof_token(state); }
 #line 121 "ext/rbs_extension/lexer.c"
 yy2:
 	rbs_skip(state);
 yy3:
-#line 148 "ext/rbs_extension/lexer.re"
+#line 149 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, ErrorToken); }
 #line 127 "ext/rbs_extension/lexer.c"
 yy4:
@@ -130,7 +130,7 @@ token rbsparser_next_token(lexstate *state) {
 	if (yych == '\t') goto yy4;
 	if (yych == ' ') goto yy4;
 yy5:
-#line 146 "ext/rbs_extension/lexer.re"
+#line 147 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tTRIVIA); }
 #line 136 "ext/rbs_extension/lexer.c"
 yy6:
@@ -151,7 +151,7 @@ token rbsparser_next_token(lexstate *state) {
 	backup = *state;
 	yych = peek(state);
 	if (yych <= 0x00000000) goto yy3;
-	goto yy67;
+	goto yy68;
 yy10:
 	rbs_skip(state);
 	yych = peek(state);
@@ -173,42 +173,42 @@ token rbsparser_next_token(lexstate *state) {
 		if (yych <= 0x0000001F) {
 			if (yych <= '\n') {
 				if (yych <= 0x00000000) goto yy3;
-				if (yych <= 0x00000008) goto yy71;
+				if (yych <= 0x00000008) goto yy72;
 				goto yy3;
 			} else {
 				if (yych == '\r') goto yy3;
-				goto yy71;
+				goto yy72;
 			}
 		} else {
 			if (yych <= '#') {
 				if (yych <= ' ') goto yy3;
-				if (yych <= '"') goto yy73;
-				goto yy71;
+				if (yych <= '"') goto yy74;
+				goto yy72;
 			} else {
 				if (yych == '%') goto yy3;
-				if (yych <= '\'') goto yy73;
+				if (yych <= '\'') goto yy74;
 				goto yy3;
 			}
 		}
 	} else {
 		if (yych <= 'Z') {
 			if (yych <= '/') {
-				if (yych == '-') goto yy71;
-				goto yy73;
+				if (yych == '-') goto yy72;
+				goto yy74;
 			} else {
-				if (yych <= '9') goto yy71;
-				if (yych <= '>') goto yy73;
-				goto yy71;
+				if (yych <= '9') goto yy72;
+				if (yych <= '>') goto yy74;
+				goto yy72;
 			}
 		} else {
 			if (yych <= '^') {
-				if (yych == '\\') goto yy73;
+				if (yych == '\\') goto yy74;
 				goto yy3;
 			} else {
-				if (yych <= 'z') goto yy71;
+				if (yych <= 'z') goto yy72;
 				if (yych <= '}') goto yy3;
-				if (yych <= '~') goto yy73;
-				goto yy71;
+				if (yych <= '~') goto yy74;
+				goto yy72;
 			}
 		}
 	}
@@ -217,7 +217,7 @@ token rbsparser_next_token(lexstate *state) {
 	rbs_skip(state);
 	backup = *state;
 	yych = peek(state);
-	if (yych == 'a') goto yy74;
+	if (yych == 'a') goto yy75;
 	goto yy8;
 yy14:
 	rbs_skip(state);
@@ -230,7 +230,7 @@ token rbsparser_next_token(lexstate *state) {
 	backup = *state;
 	yych = peek(state);
 	if (yych <= 0x00000000) goto yy3;
-	goto yy76;
+	goto yy77;
 yy16:
 	rbs_skip(state);
 #line 24 "ext/rbs_extension/lexer.re"
@@ -244,7 +244,7 @@ token rbsparser_next_token(lexstate *state) {
 yy18:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == '*') goto yy80;
+	if (yych == '*') goto yy81;
 #line 35 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, pSTAR); }
 #line 251 "ext/rbs_extension/lexer.c"
@@ -264,7 +264,7 @@ token rbsparser_next_token(lexstate *state) {
 	rbs_skip(state);
 	yych = peek(state);
 	switch (yych) {
-		case '-': goto yy81;
+		case '-': goto yy82;
 		case '0':
 		case '1':
 		case '2':
@@ -275,7 +275,7 @@ token rbsparser_next_token(lexstate *state) {
 		case '7':
 		case '8':
 		case '9': goto yy25;
-		case '>': goto yy82;
+		case '>': goto yy83;
 		case '@': goto yy24;
 		default: goto yy8;
 	}
@@ -284,7 +284,7 @@ token rbsparser_next_token(lexstate *state) {
 	rbs_skip(state);
 	backup = *state;
 	yych = peek(state);
-	if (yych == '.') goto yy83;
+	if (yych == '.') goto yy84;
 yy23:
 #line 37 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, pDOT); }
@@ -308,25 +308,25 @@ token rbsparser_next_token(lexstate *state) {
 	backup = *state;
 	yych = peek(state);
 	switch (yych) {
-		case '!': goto yy84;
-		case '"': goto yy86;
-		case '$': goto yy87;
+		case '!': goto yy85;
+		case '"': goto yy87;
+		case '$': goto yy88;
 		case '%':
 		case '&':
 		case '/':
 		case '^':
 		case '`':
 		case '|':
-		case '~': goto yy88;
-		case '\'': goto yy89;
-		case '*': goto yy90;
+		case '~': goto yy89;
+		case '\'': goto yy90;
+		case '*': goto yy91;
 		case '+':
-		case '-': goto yy91;
-		case ':': goto yy92;
-		case '<': goto yy93;
-		case '=': goto yy94;
-		case '>': goto yy95;
-		case '@': goto yy96;
+		case '-': goto yy92;
+		case ':': goto yy93;
+		case '<': goto yy94;
+		case '=': goto yy95;
+		case '>': goto yy96;
+		case '@': goto yy97;
 		case 'A':
 		case 'B':
 		case 'C':
@@ -379,8 +379,8 @@ token rbsparser_next_token(lexstate *state) {
 		case 'w':
 		case 'x':
 		case 'y':
-		case 'z': goto yy97;
-		case '[': goto yy99;
+		case 'z': goto yy98;
+		case '[': goto yy100;
 		default: goto yy28;
 	}
 yy28:
@@ -392,7 +392,7 @@ token rbsparser_next_token(lexstate *state) {
 	yych = peek(state);
 	if (yych <= ';') goto yy30;
 	if (yych <= '<') goto yy24;
-	if (yych <= '=') goto yy100;
+	if (yych <= '=') goto yy101;
 yy30:
 #line 46 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, pLT); }
@@ -402,8 +402,8 @@ token rbsparser_next_token(lexstate *state) {
 	yych = peek(state);
 	if (yych <= '>') {
 		if (yych <= '<') goto yy32;
-		if (yych <= '=') goto yy101;
-		goto yy102;
+		if (yych <= '=') goto yy102;
+		goto yy103;
 	} else {
 		if (yych == '~') goto yy24;
 	}
@@ -430,19 +430,19 @@ token rbsparser_next_token(lexstate *state) {
 	if (yych <= '_') {
 		if (yych <= '@') {
 			if (yych <= '?') goto yy3;
-			goto yy103;
+			goto yy104;
 		} else {
-			if (yych <= 'Z') goto yy104;
+			if (yych <= 'Z') goto yy105;
 			if (yych <= '^') goto yy3;
-			goto yy104;
+			goto yy105;
 		}
 	} else {
 		if (yych <= 'q') {
 			if (yych <= '`') goto yy3;
-			goto yy104;
+			goto yy105;
 		} else {
-			if (yych <= 'r') goto yy107;
-			if (yych <= 'z') goto yy104;
+			if (yych <= 'r') goto yy108;
+			if (yych <= 'z') goto yy105;
 			goto yy3;
 		}
 	}
@@ -451,10 +451,10 @@ token rbsparser_next_token(lexstate *state) {
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy36;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
@@ -466,13 +466,13 @@ token rbsparser_next_token(lexstate *state) {
 		}
 	}
 yy37:
-#line 132 "ext/rbs_extension/lexer.re"
+#line 133 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tUIDENT); }
 #line 472 "ext/rbs_extension/lexer.c"
 yy38:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == ']') goto yy110;
+	if (yych == ']') goto yy111;
 #line 26 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, pLBRACKET); }
 #line 479 "ext/rbs_extension/lexer.c"
@@ -491,23 +491,23 @@ token rbsparser_next_token(lexstate *state) {
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
-			if (yych <= '9') goto yy111;
-			if (yych >= '=') goto yy109;
+			if (yych <= '9') goto yy112;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
 			if (yych <= '@') goto yy42;
-			if (yych <= 'Z') goto yy114;
+			if (yych <= 'Z') goto yy115;
 		} else {
-			if (yych <= '_') goto yy116;
+			if (yych <= '_') goto yy117;
 			if (yych <= '`') goto yy42;
-			if (yych <= 'z') goto yy111;
+			if (yych <= 'z') goto yy112;
 		}
 	}
 yy42:
-#line 135 "ext/rbs_extension/lexer.re"
+#line 136 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tULLIDENT); }
 #line 513 "ext/rbs_extension/lexer.c"
 yy43:
@@ -517,9 +517,9 @@ token rbsparser_next_token(lexstate *state) {
 	yych = peek(state);
 	if (yych <= ' ') {
 		if (yych <= 0x00000000) goto yy44;
-		if (yych <= 0x0000001F) goto yy117;
+		if (yych <= 0x0000001F) goto yy118;
 	} else {
-		if (yych != ':') goto yy117;
+		if (yych != ':') goto yy118;
 	}
 yy44:
 #line 39 "ext/rbs_extension/lexer.re"
@@ -529,42 +529,42 @@ token rbsparser_next_token(lexstate *state) {
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= 'r') {
-		if (yych == 'l') goto yy118;
+		if (yych == 'l') goto yy119;
 		goto yy53;
 	} else {
-		if (yych <= 's') goto yy119;
-		if (yych <= 't') goto yy121;
+		if (yych <= 's') goto yy120;
+		if (yych <= 't') goto yy122;
 		goto yy53;
 	}
 yy46:
-#line 131 "ext/rbs_extension/lexer.re"
+#line 132 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tLIDENT); }
 #line 543 "ext/rbs_extension/lexer.c"
 yy47:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'o') goto yy122;
+	if (yych == 'o') goto yy123;
 	goto yy53;
 yy48:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'l') goto yy123;
+	if (yych == 'l') goto yy124;
 	goto yy53;
 yy49:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy124;
+	if (yych == 'e') goto yy125;
 	goto yy53;
 yy50:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'n') goto yy125;
-	if (yych == 'x') goto yy126;
+	if (yych == 'n') goto yy126;
+	if (yych == 'x') goto yy127;
 	goto yy53;
 yy51:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'a') goto yy127;
+	if (yych == 'a') goto yy128;
 	goto yy53;
 yy52:
 	rbs_skip(state);
@@ -572,12 +572,12 @@ token rbsparser_next_token(lexstate *state) {
 yy53:
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 			goto yy46;
 		} else {
 			if (yych <= '9') goto yy52;
 			if (yych <= '<') goto yy46;
-			goto yy109;
+			goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
@@ -593,90 +593,95 @@ token rbsparser_next_token(lexstate *state) {
 yy54:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'n') goto yy128;
+	if (yych == 'n') goto yy129;
 	goto yy53;
 yy55:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'o') goto yy130;
+	if (yych == 'o') goto yy131;
 	goto yy53;
 yy56:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'i') goto yy131;
+	if (yych == 'i') goto yy132;
 	goto yy53;
 yy57:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'u') goto yy132;
+	if (yych == 'u') goto yy133;
 	goto yy53;
 yy58:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'r') goto yy133;
-	if (yych == 'u') goto yy134;
+	if (yych == 'r') goto yy134;
+	if (yych == 'u') goto yy135;
 	goto yy53;
 yy59:
+	rbs_skip(state);
+	yych = peek(state);
+	if (yych == 'e') goto yy136;
+	goto yy53;
+yy60:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= 'h') {
-		if (yych == 'e') goto yy135;
+		if (yych == 'e') goto yy137;
 		goto yy53;
 	} else {
-		if (yych <= 'i') goto yy136;
-		if (yych == 'k') goto yy137;
+		if (yych <= 'i') goto yy138;
+		if (yych == 'k') goto yy139;
 		goto yy53;
 	}
-yy60:
+yy61:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= 'q') {
-		if (yych == 'o') goto yy138;
+		if (yych == 'o') goto yy140;
 		goto yy53;
 	} else {
-		if (yych <= 'r') goto yy139;
-		if (yych == 'y') goto yy140;
+		if (yych <= 'r') goto yy141;
+		if (yych == 'y') goto yy142;
 		goto yy53;
 	}
-yy61:
+yy62:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'n') goto yy141;
-	if (yych == 's') goto yy142;
+	if (yych == 'n') goto yy143;
+	if (yych == 's') goto yy144;
 	goto yy53;
-yy62:
+yy63:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'o') goto yy143;
+	if (yych == 'o') goto yy145;
 	goto yy53;
-yy63:
+yy64:
 	rbs_skip(state);
 #line 28 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, pLBRACE); }
-#line 657 "ext/rbs_extension/lexer.c"
-yy64:
+#line 662 "ext/rbs_extension/lexer.c"
+yy65:
 	rbs_skip(state);
 #line 31 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, pBAR); }
-#line 662 "ext/rbs_extension/lexer.c"
-yy65:
+#line 667 "ext/rbs_extension/lexer.c"
+yy66:
 	rbs_skip(state);
 #line 29 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, pRBRACE); }
-#line 667 "ext/rbs_extension/lexer.c"
-yy66:
+#line 672 "ext/rbs_extension/lexer.c"
+yy67:
 	rbs_skip(state);
 	yych = peek(state);
-yy67:
+yy68:
 	if (yych <= '"') {
-		if (yych <= 0x00000000) goto yy68;
-		if (yych <= '!') goto yy66;
-		goto yy69;
+		if (yych <= 0x00000000) goto yy69;
+		if (yych <= '!') goto yy67;
+		goto yy70;
 	} else {
-		if (yych == '\\') goto yy70;
-		goto yy66;
+		if (yych == '\\') goto yy71;
+		goto yy67;
 	}
-yy68:
+yy69:
 	*state = backup;
 	if (yyaccept <= 3) {
 		if (yyaccept <= 1) {
@@ -697,561 +702,556 @@ token rbsparser_next_token(lexstate *state) {
 			if (yyaccept == 4) {
 				goto yy44;
 			} else {
-				goto yy78;
+				goto yy79;
 			}
 		} else {
-			goto yy159;
+			goto yy161;
 		}
 	}
-yy69:
+yy70:
 	rbs_skip(state);
-#line 109 "ext/rbs_extension/lexer.re"
+#line 110 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tDQSTRING); }
-#line 711 "ext/rbs_extension/lexer.c"
-yy70:
+#line 716 "ext/rbs_extension/lexer.c"
+yy71:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'u') goto yy144;
-	if (yych == 'x') goto yy145;
-	goto yy66;
-yy71:
+	if (yych == 'u') goto yy146;
+	if (yych == 'x') goto yy147;
+	goto yy67;
+yy72:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= ',') {
 		if (yych <= '\f') {
-			if (yych <= 0x00000000) goto yy72;
-			if (yych <= 0x00000008) goto yy71;
-			if (yych >= '\v') goto yy71;
+			if (yych <= 0x00000000) goto yy73;
+			if (yych <= 0x00000008) goto yy72;
+			if (yych >= '\v') goto yy72;
 		} else {
 			if (yych <= 0x0000001F) {
-				if (yych >= 0x0000000E) goto yy71;
+				if (yych >= 0x0000000E) goto yy72;
 			} else {
-				if (yych == '#') goto yy71;
+				if (yych == '#') goto yy72;
 			}
 		}
 	} else {
 		if (yych <= '>') {
-			if (yych <= '-') goto yy71;
-			if (yych <= '/') goto yy72;
-			if (yych <= '9') goto yy71;
+			if (yych <= '-') goto yy72;
+			if (yych <= '/') goto yy73;
+			if (yych <= '9') goto yy72;
 		} else {
 			if (yych <= '^') {
-				if (yych <= 'Z') goto yy71;
+				if (yych <= 'Z') goto yy72;
 			} else {
-				if (yych <= 'z') goto yy71;
-				if (yych >= 0x0000007F) goto yy71;
+				if (yych <= 'z') goto yy72;
+				if (yych >= 0x0000007F) goto yy72;
 			}
 		}
 	}
-yy72:
-#line 142 "ext/rbs_extension/lexer.re"
-	{ return next_token(state, tGIDENT); }
-#line 750 "ext/rbs_extension/lexer.c"
 yy73:
-	rbs_skip(state);
-	goto yy72;
+#line 143 "ext/rbs_extension/lexer.re"
+	{ return next_token(state, tGIDENT); }
+#line 755 "ext/rbs_extension/lexer.c"
 yy74:
+	rbs_skip(state);
+	goto yy73;
+yy75:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= 'Z') {
 		if (yych <= '(') {
-			if (yych <= '\'') goto yy68;
-			goto yy146;
+			if (yych <= '\'') goto yy69;
+			goto yy148;
 		} else {
-			if (yych == '<') goto yy147;
-			goto yy68;
+			if (yych == '<') goto yy149;
+			goto yy69;
 		}
 	} else {
 		if (yych <= 'z') {
-			if (yych <= '[') goto yy148;
-			goto yy68;
+			if (yych <= '[') goto yy150;
+			goto yy69;
 		} else {
-			if (yych <= '{') goto yy149;
-			if (yych <= '|') goto yy150;
-			goto yy68;
+			if (yych <= '{') goto yy151;
+			if (yych <= '|') goto yy152;
+			goto yy69;
 		}
 	}
-yy75:
+yy76:
 	rbs_skip(state);
 	yych = peek(state);
-yy76:
+yy77:
 	if (yych <= '\'') {
-		if (yych <= 0x00000000) goto yy68;
-		if (yych <= '&') goto yy75;
+		if (yych <= 0x00000000) goto yy69;
+		if (yych <= '&') goto yy76;
 	} else {
-		if (yych == '\\') goto yy79;
-		goto yy75;
+		if (yych == '\\') goto yy80;
+		goto yy76;
 	}
-yy77:
-	rbs_skip(state);
 yy78:
-#line 110 "ext/rbs_extension/lexer.re"
-	{ return next_token(state, tSQSTRING); }
-#line 791 "ext/rbs_extension/lexer.c"
+	rbs_skip(state);
 yy79:
+#line 111 "ext/rbs_extension/lexer.re"
+	{ return next_token(state, tSQSTRING); }
+#line 796 "ext/rbs_extension/lexer.c"
+yy80:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '\'') {
-		if (yych <= 0x00000000) goto yy68;
-		if (yych <= '&') goto yy75;
-		goto yy151;
+		if (yych <= 0x00000000) goto yy69;
+		if (yych <= '&') goto yy76;
+		goto yy153;
 	} else {
-		if (yych == '\\') goto yy79;
-		goto yy75;
+		if (yych == '\\') goto yy80;
+		goto yy76;
 	}
-yy80:
+yy81:
 	rbs_skip(state);
 #line 36 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, pSTAR2); }
-#line 807 "ext/rbs_extension/lexer.c"
-yy81:
+#line 812 "ext/rbs_extension/lexer.c"
+yy82:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych >= 0x00000001) goto yy81;
+	if (yych >= 0x00000001) goto yy82;
 #line 49 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tINLINECOMMENT); }
-#line 814 "ext/rbs_extension/lexer.c"
-yy82:
-	rbs_skip(state);
-#line 41 "ext/rbs_extension/lexer.re"
-	{ return next_token(state, pARROW); }
 #line 819 "ext/rbs_extension/lexer.c"
 yy83:
 	rbs_skip(state);
-	yych = peek(state);
-	if (yych == '.') goto yy152;
-	goto yy68;
+#line 41 "ext/rbs_extension/lexer.re"
+	{ return next_token(state, pARROW); }
+#line 824 "ext/rbs_extension/lexer.c"
 yy84:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == '=') goto yy88;
-	if (yych == '~') goto yy88;
+	if (yych == '.') goto yy154;
+	goto yy69;
 yy85:
-#line 129 "ext/rbs_extension/lexer.re"
-	{ return next_token(state, tSYMBOL); }
-#line 833 "ext/rbs_extension/lexer.c"
+	rbs_skip(state);
+	yych = peek(state);
+	if (yych == '=') goto yy89;
+	if (yych == '~') goto yy89;
 yy86:
+#line 130 "ext/rbs_extension/lexer.re"
+	{ return next_token(state, tSYMBOL); }
+#line 838 "ext/rbs_extension/lexer.c"
+yy87:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '"') {
-		if (yych <= 0x00000000) goto yy68;
-		if (yych <= '!') goto yy86;
-		goto yy153;
+		if (yych <= 0x00000000) goto yy69;
+		if (yych <= '!') goto yy87;
+		goto yy155;
 	} else {
-		if (yych == '\\') goto yy154;
-		goto yy86;
+		if (yych == '\\') goto yy156;
+		goto yy87;
 	}
-yy87:
+yy88:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= ')') {
 		if (yych <= 0x0000001F) {
 			if (yych <= '\n') {
-				if (yych <= 0x00000000) goto yy68;
-				if (yych <= 0x00000008) goto yy155;
-				goto yy68;
+				if (yych <= 0x00000000) goto yy69;
+				if (yych <= 0x00000008) goto yy157;
+				goto yy69;
 			} else {
-				if (yych == '\r') goto yy68;
-				goto yy155;
+				if (yych == '\r') goto yy69;
+				goto yy157;
 			}
 		} else {
 			if (yych <= '#') {
-				if (yych <= ' ') goto yy68;
-				if (yych <= '"') goto yy157;
-				goto yy155;
+				if (yych <= ' ') goto yy69;
+				if (yych <= '"') goto yy159;
+				goto yy157;
 			} else {
-				if (yych == '%') goto yy68;
-				if (yych <= '\'') goto yy157;
-				goto yy68;
+				if (yych == '%') goto yy69;
+				if (yych <= '\'') goto yy159;
+				goto yy69;
 			}
 		}
 	} else {
 		if (yych <= 'Z') {
 			if (yych <= '/') {
-				if (yych == '-') goto yy155;
-				goto yy157;
+				if (yych == '-') goto yy157;
+				goto yy159;
 			} else {
-				if (yych <= '9') goto yy155;
-				if (yych <= '>') goto yy157;
-				goto yy155;
+				if (yych <= '9') goto yy157;
+				if (yych <= '>') goto yy159;
+				goto yy157;
 			}
 		} else {
 			if (yych <= '^') {
-				if (yych == '\\') goto yy157;
-				goto yy68;
+				if (yych == '\\') goto yy159;
+				goto yy69;
 			} else {
-				if (yych <= 'z') goto yy155;
-				if (yych <= '}') goto yy68;
-				if (yych <= '~') goto yy157;
-				goto yy155;
+				if (yych <= 'z') goto yy157;
+				if (yych <= '}') goto yy69;
+				if (yych <= '~') goto yy159;
+				goto yy157;
 			}
 		}
 	}
-yy88:
-	rbs_skip(state);
-	goto yy85;
 yy89:
+	rbs_skip(state);
+	goto yy86;
+yy90:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '\'') {
-		if (yych <= 0x00000000) goto yy68;
-		if (yych <= '&') goto yy89;
-		goto yy158;
+		if (yych <= 0x00000000) goto yy69;
+		if (yych <= '&') goto yy90;
+		goto yy160;
 	} else {
-		if (yych == '\\') goto yy160;
-		goto yy89;
+		if (yych == '\\') goto yy162;
+		goto yy90;
 	}
-yy90:
-	rbs_skip(state);
-	yych = peek(state);
-	if (yych == '*') goto yy88;
-	goto yy85;
 yy91:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == '@') goto yy88;
-	goto yy85;
+	if (yych == '*') goto yy89;
+	goto yy86;
 yy92:
 	rbs_skip(state);
-#line 45 "ext/rbs_extension/lexer.re"
-	{ return next_token(state, pCOLON2); }
-#line 919 "ext/rbs_extension/lexer.c"
+	yych = peek(state);
+	if (yych == '@') goto yy89;
+	goto yy86;
 yy93:
 	rbs_skip(state);
-	yych = peek(state);
-	if (yych <= ';') goto yy85;
-	if (yych <= '<') goto yy88;
-	if (yych <= '=') goto yy161;
-	goto yy85;
+#line 45 "ext/rbs_extension/lexer.re"
+	{ return next_token(state, pCOLON2); }
+#line 924 "ext/rbs_extension/lexer.c"
 yy94:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == '=') goto yy162;
-	if (yych == '~') goto yy88;
-	goto yy68;
+	if (yych <= ';') goto yy86;
+	if (yych <= '<') goto yy89;
+	if (yych <= '=') goto yy163;
+	goto yy86;
 yy95:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych <= '<') goto yy85;
-	if (yych <= '>') goto yy88;
-	goto yy85;
+	if (yych == '=') goto yy164;
+	if (yych == '~') goto yy89;
+	goto yy69;
 yy96:
+	rbs_skip(state);
+	yych = peek(state);
+	if (yych <= '<') goto yy86;
+	if (yych <= '>') goto yy89;
+	goto yy86;
+yy97:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '^') {
-		if (yych <= '?') goto yy68;
-		if (yych <= '@') goto yy163;
-		if (yych <= 'Z') goto yy164;
-		goto yy68;
+		if (yych <= '?') goto yy69;
+		if (yych <= '@') goto yy165;
+		if (yych <= 'Z') goto yy166;
+		goto yy69;
 	} else {
-		if (yych == '`') goto yy68;
-		if (yych <= 'z') goto yy164;
-		goto yy68;
+		if (yych == '`') goto yy69;
+		if (yych <= 'z') goto yy166;
+		goto yy69;
 	}
-yy97:
+yy98:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '>') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy166;
+			if (yych == '!') goto yy168;
 		} else {
-			if (yych <= '9') goto yy97;
-			if (yych == '=') goto yy166;
+			if (yych <= '9') goto yy98;
+			if (yych == '=') goto yy168;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '?') goto yy166;
-			if (yych <= '@') goto yy98;
-			if (yych <= 'Z') goto yy97;
+			if (yych <= '?') goto yy168;
+			if (yych <= '@') goto yy99;
+			if (yych <= 'Z') goto yy98;
 		} else {
-			if (yych == '`') goto yy98;
-			if (yych <= 'z') goto yy97;
+			if (yych == '`') goto yy99;
+			if (yych <= 'z') goto yy98;
 		}
 	}
-yy98:
-#line 125 "ext/rbs_extension/lexer.re"
-	{ return next_token(state, tSYMBOL); }
-#line 975 "ext/rbs_extension/lexer.c"
 yy99:
+#line 126 "ext/rbs_extension/lexer.re"
+	{ return next_token(state, tSYMBOL); }
+#line 980 "ext/rbs_extension/lexer.c"
+yy100:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == ']') goto yy162;
-	goto yy68;
-yy100:
+	if (yych == ']') goto yy164;
+	goto yy69;
+yy101:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych == '>') goto yy24;
 	goto yy8;
-yy101:
+yy102:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych == '=') goto yy24;
 	goto yy8;
-yy102:
+yy103:
 	rbs_skip(state);
 #line 42 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, pFATARROW); }
-#line 995 "ext/rbs_extension/lexer.c"
-yy103:
+#line 1000 "ext/rbs_extension/lexer.c"
+yy104:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '^') {
-		if (yych <= '@') goto yy68;
-		if (yych <= 'Z') goto yy167;
-		goto yy68;
+		if (yych <= '@') goto yy69;
+		if (yych <= 'Z') goto yy169;
+		goto yy69;
 	} else {
-		if (yych == '`') goto yy68;
-		if (yych <= 'z') goto yy167;
-		goto yy68;
+		if (yych == '`') goto yy69;
+		if (yych <= 'z') goto yy169;
+		goto yy69;
 	}
-yy104:
+yy105:
 	rbs_skip(state);
 	yych = peek(state);
-yy105:
+yy106:
 	if (yych <= 'Z') {
-		if (yych <= '/') goto yy106;
-		if (yych <= '9') goto yy104;
-		if (yych >= 'A') goto yy104;
+		if (yych <= '/') goto yy107;
+		if (yych <= '9') goto yy105;
+		if (yych >= 'A') goto yy105;
 	} else {
 		if (yych <= '_') {
-			if (yych >= '_') goto yy104;
+			if (yych >= '_') goto yy105;
 		} else {
-			if (yych <= '`') goto yy106;
-			if (yych <= 'z') goto yy104;
+			if (yych <= '`') goto yy107;
+			if (yych <= 'z') goto yy105;
 		}
 	}
-yy106:
-#line 139 "ext/rbs_extension/lexer.re"
-	{ return next_token(state, tAIDENT); }
-#line 1027 "ext/rbs_extension/lexer.c"
 yy107:
-	rbs_skip(state);
-	yych = peek(state);
-	if (yych == 'b') goto yy169;
-	goto yy105;
+#line 140 "ext/rbs_extension/lexer.re"
+	{ return next_token(state, tAIDENT); }
+#line 1032 "ext/rbs_extension/lexer.c"
 yy108:
 	rbs_skip(state);
-#line 136 "ext/rbs_extension/lexer.re"
-	{ return next_token(state, tBANGIDENT); }
-#line 1037 "ext/rbs_extension/lexer.c"
+	yych = peek(state);
+	if (yych == 'b') goto yy171;
+	goto yy106;
 yy109:
 	rbs_skip(state);
 #line 137 "ext/rbs_extension/lexer.re"
-	{ return next_token(state, tEQIDENT); }
+	{ return next_token(state, tBANGIDENT); }
 #line 1042 "ext/rbs_extension/lexer.c"
 yy110:
 	rbs_skip(state);
+#line 138 "ext/rbs_extension/lexer.re"
+	{ return next_token(state, tEQIDENT); }
+#line 1047 "ext/rbs_extension/lexer.c"
+yy111:
+	rbs_skip(state);
 	yych = peek(state);
 	if (yych == '=') goto yy24;
 #line 47 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, pAREF_OPR); }
-#line 1049 "ext/rbs_extension/lexer.c"
-yy111:
+#line 1054 "ext/rbs_extension/lexer.c"
+yy112:
 	rbs_skip(state);
 	yych = peek(state);
-yy112:
+yy113:
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
-			if (yych <= '9') goto yy111;
-			if (yych >= '=') goto yy109;
+			if (yych <= '9') goto yy112;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy113;
-			if (yych <= 'Z') goto yy111;
+			if (yych <= '@') goto yy114;
+			if (yych <= 'Z') goto yy112;
 		} else {
-			if (yych == '`') goto yy113;
-			if (yych <= 'z') goto yy111;
+			if (yych == '`') goto yy114;
+			if (yych <= 'z') goto yy112;
 		}
 	}
-yy113:
-#line 133 "ext/rbs_extension/lexer.re"
-	{ return next_token(state, tULLIDENT); }
-#line 1073 "ext/rbs_extension/lexer.c"
 yy114:
+#line 134 "ext/rbs_extension/lexer.re"
+	{ return next_token(state, tULLIDENT); }
+#line 1078 "ext/rbs_extension/lexer.c"
+yy115:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
-			if (yych <= '9') goto yy114;
-			if (yych >= '=') goto yy109;
+			if (yych <= '9') goto yy115;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy115;
-			if (yych <= 'Z') goto yy114;
+			if (yych <= '@') goto yy116;
+			if (yych <= 'Z') goto yy115;
 		} else {
-			if (yych == '`') goto yy115;
-			if (yych <= 'z') goto yy114;
+			if (yych == '`') goto yy116;
+			if (yych <= 'z') goto yy115;
 		}
 	}
-yy115:
-#line 134 "ext/rbs_extension/lexer.re"
-	{ return next_token(state, tULIDENT); }
-#line 1096 "ext/rbs_extension/lexer.c"
 yy116:
-	rbs_skip(state);
-	yych = peek(state);
-	if (yych == 't') goto yy170;
-	goto yy112;
+#line 135 "ext/rbs_extension/lexer.re"
+	{ return next_token(state, tULIDENT); }
+#line 1101 "ext/rbs_extension/lexer.c"
 yy117:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych <= 0x00000000) goto yy68;
-	if (yych == '`') goto yy171;
-	goto yy117;
+	if (yych == 't') goto yy172;
+	goto yy113;
 yy118:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'i') goto yy172;
-	goto yy53;
+	if (yych <= 0x00000000) goto yy69;
+	if (yych == '`') goto yy173;
+	goto yy118;
 yy119:
+	rbs_skip(state);
+	yych = peek(state);
+	if (yych == 'i') goto yy174;
+	goto yy53;
+yy120:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy120;
+			if (yych <= '@') goto yy121;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy120;
+			if (yych == '`') goto yy121;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy120:
+yy121:
 #line 97 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kAS); }
-#line 1135 "ext/rbs_extension/lexer.c"
-yy121:
-	rbs_skip(state);
-	yych = peek(state);
-	if (yych == 't') goto yy173;
-	goto yy53;
+#line 1140 "ext/rbs_extension/lexer.c"
 yy122:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'o') goto yy174;
 	if (yych == 't') goto yy175;
 	goto yy53;
 yy123:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'a') goto yy177;
+	if (yych == 'o') goto yy176;
+	if (yych == 't') goto yy177;
 	goto yy53;
 yy124:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'f') goto yy178;
+	if (yych == 'a') goto yy179;
 	goto yy53;
 yy125:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'd') goto yy180;
+	if (yych == 'f') goto yy180;
 	goto yy53;
 yy126:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 't') goto yy182;
+	if (yych == 'd') goto yy182;
 	goto yy53;
 yy127:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'l') goto yy183;
+	if (yych == 't') goto yy184;
 	goto yy53;
 yy128:
+	rbs_skip(state);
+	yych = peek(state);
+	if (yych == 'l') goto yy185;
+	goto yy53;
+yy129:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '^') {
 		if (yych <= '9') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 			if (yych >= '0') goto yy52;
 		} else {
 			if (yych <= '=') {
-				if (yych >= '=') goto yy109;
+				if (yych >= '=') goto yy110;
 			} else {
-				if (yych <= '@') goto yy129;
+				if (yych <= '@') goto yy130;
 				if (yych <= 'Z') goto yy52;
 			}
 		}
 	} else {
 		if (yych <= 'c') {
-			if (yych == '`') goto yy129;
+			if (yych == '`') goto yy130;
 			if (yych <= 'b') goto yy52;
-			goto yy184;
+			goto yy186;
 		} else {
 			if (yych <= 's') {
 				if (yych <= 'r') goto yy52;
-				goto yy185;
+				goto yy187;
 			} else {
-				if (yych <= 't') goto yy186;
+				if (yych <= 't') goto yy188;
 				if (yych <= 'z') goto yy52;
 			}
 		}
 	}
-yy129:
+yy130:
 #line 78 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kIN); }
-#line 1205 "ext/rbs_extension/lexer.c"
-yy130:
-	rbs_skip(state);
-	yych = peek(state);
-	if (yych == 'd') goto yy187;
-	goto yy53;
+#line 1210 "ext/rbs_extension/lexer.c"
 yy131:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'l') goto yy188;
+	if (yych == 'd') goto yy189;
 	goto yy53;
 yy132:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 't') goto yy190;
+	if (yych == 'l') goto yy190;
 	goto yy53;
 yy133:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy192;
-	if (yych == 'i') goto yy193;
+	if (yych == 't') goto yy192;
 	goto yy53;
 yy134:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'b') goto yy194;
+	if (yych == 'e') goto yy194;
+	if (yych == 'i') goto yy195;
 	goto yy53;
 yy135:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'l') goto yy195;
+	if (yych == 'b') goto yy196;
 	goto yy53;
 yy136:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'n') goto yy196;
+	if (yych == 't') goto yy197;
 	goto yy53;
 yy137:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'i') goto yy197;
+	if (yych == 'l') goto yy198;
 	goto yy53;
 yy138:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'p') goto yy198;
+	if (yych == 'n') goto yy199;
 	goto yy53;
 yy139:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'u') goto yy200;
+	if (yych == 'i') goto yy200;
 	goto yy53;
 yy140:
 	rbs_skip(state);
@@ -1261,1533 +1261,1581 @@ token rbsparser_next_token(lexstate *state) {
 yy141:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'c') goto yy202;
-	if (yych == 't') goto yy203;
+	if (yych == 'u') goto yy203;
 	goto yy53;
 yy142:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy204;
+	if (yych == 'p') goto yy204;
 	goto yy53;
 yy143:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'i') goto yy206;
+	if (yych == 'c') goto yy205;
+	if (yych == 't') goto yy206;
 	goto yy53;
 yy144:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych <= '@') {
-		if (yych <= '/') goto yy68;
-		if (yych <= '9') goto yy207;
-		goto yy68;
-	} else {
-		if (yych <= 'F') goto yy207;
-		if (yych <= '`') goto yy68;
-		if (yych <= 'f') goto yy207;
-		goto yy68;
-	}
+	if (yych == 'e') goto yy207;
+	goto yy53;
 yy145:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych <= '/') goto yy68;
-	if (yych <= '9') goto yy66;
-	if (yych <= '`') goto yy68;
-	if (yych <= 'f') goto yy66;
-	goto yy68;
+	if (yych == 'i') goto yy209;
+	goto yy53;
 yy146:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych <= 0x00000000) goto yy68;
-	if (yych == ')') goto yy208;
-	goto yy146;
+	if (yych <= '@') {
+		if (yych <= '/') goto yy69;
+		if (yych <= '9') goto yy210;
+		goto yy69;
+	} else {
+		if (yych <= 'F') goto yy210;
+		if (yych <= '`') goto yy69;
+		if (yych <= 'f') goto yy210;
+		goto yy69;
+	}
 yy147:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych <= 0x00000000) goto yy68;
-	if (yych == '>') goto yy209;
-	goto yy147;
+	if (yych <= '/') goto yy69;
+	if (yych <= '9') goto yy67;
+	if (yych <= '`') goto yy69;
+	if (yych <= 'f') goto yy67;
+	goto yy69;
 yy148:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych <= 0x00000000) goto yy68;
-	if (yych == ']') goto yy210;
+	if (yych <= 0x00000000) goto yy69;
+	if (yych == ')') goto yy211;
 	goto yy148;
 yy149:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych <= 0x00000000) goto yy68;
-	if (yych == '}') goto yy211;
+	if (yych <= 0x00000000) goto yy69;
+	if (yych == '>') goto yy212;
 	goto yy149;
 yy150:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych <= 0x00000000) goto yy68;
-	if (yych == '|') goto yy212;
+	if (yych <= 0x00000000) goto yy69;
+	if (yych == ']') goto yy213;
 	goto yy150;
 yy151:
+	rbs_skip(state);
+	yych = peek(state);
+	if (yych <= 0x00000000) goto yy69;
+	if (yych == '}') goto yy214;
+	goto yy151;
+yy152:
+	rbs_skip(state);
+	yych = peek(state);
+	if (yych <= 0x00000000) goto yy69;
+	if (yych == '|') goto yy215;
+	goto yy152;
+yy153:
 	yyaccept = 5;
 	rbs_skip(state);
 	backup = *state;
 	yych = peek(state);
 	if (yych <= '\'') {
-		if (yych <= 0x00000000) goto yy78;
-		if (yych <= '&') goto yy75;
-		goto yy77;
+		if (yych <= 0x00000000) goto yy79;
+		if (yych <= '&') goto yy76;
+		goto yy78;
 	} else {
-		if (yych == '\\') goto yy79;
-		goto yy75;
+		if (yych == '\\') goto yy80;
+		goto yy76;
 	}
-yy152:
+yy154:
 	rbs_skip(state);
 #line 38 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, pDOT3); }
-#line 1346 "ext/rbs_extension/lexer.c"
-yy153:
+#line 1356 "ext/rbs_extension/lexer.c"
+yy155:
 	rbs_skip(state);
-#line 111 "ext/rbs_extension/lexer.re"
+#line 112 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tDQSYMBOL); }
-#line 1351 "ext/rbs_extension/lexer.c"
-yy154:
+#line 1361 "ext/rbs_extension/lexer.c"
+yy156:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'u') goto yy213;
-	if (yych == 'x') goto yy214;
-	goto yy86;
-yy155:
+	if (yych == 'u') goto yy216;
+	if (yych == 'x') goto yy217;
+	goto yy87;
+yy157:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= ',') {
 		if (yych <= '\f') {
-			if (yych <= 0x00000000) goto yy156;
-			if (yych <= 0x00000008) goto yy155;
-			if (yych >= '\v') goto yy155;
+			if (yych <= 0x00000000) goto yy158;
+			if (yych <= 0x00000008) goto yy157;
+			if (yych >= '\v') goto yy157;
 		} else {
 			if (yych <= 0x0000001F) {
-				if (yych >= 0x0000000E) goto yy155;
+				if (yych >= 0x0000000E) goto yy157;
 			} else {
-				if (yych == '#') goto yy155;
+				if (yych == '#') goto yy157;
 			}
 		}
 	} else {
 		if (yych <= '>') {
-			if (yych <= '-') goto yy155;
-			if (yych <= '/') goto yy156;
-			if (yych <= '9') goto yy155;
+			if (yych <= '-') goto yy157;
+			if (yych <= '/') goto yy158;
+			if (yych <= '9') goto yy157;
 		} else {
 			if (yych <= '^') {
-				if (yych <= 'Z') goto yy155;
+				if (yych <= 'Z') goto yy157;
 			} else {
-				if (yych <= 'z') goto yy155;
-				if (yych >= 0x0000007F) goto yy155;
+				if (yych <= 'z') goto yy157;
+				if (yych >= 0x0000007F) goto yy157;
 			}
 		}
 	}
-yy156:
-#line 128 "ext/rbs_extension/lexer.re"
+yy158:
+#line 129 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tSYMBOL); }
-#line 1390 "ext/rbs_extension/lexer.c"
-yy157:
+#line 1400 "ext/rbs_extension/lexer.c"
+yy159:
 	rbs_skip(state);
-	goto yy156;
-yy158:
+	goto yy158;
+yy160:
 	rbs_skip(state);
-yy159:
-#line 112 "ext/rbs_extension/lexer.re"
+yy161:
+#line 113 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tSQSYMBOL); }
-#line 1399 "ext/rbs_extension/lexer.c"
-yy160:
+#line 1409 "ext/rbs_extension/lexer.c"
+yy162:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '\'') {
-		if (yych <= 0x00000000) goto yy68;
-		if (yych <= '&') goto yy89;
-		goto yy215;
+		if (yych <= 0x00000000) goto yy69;
+		if (yych <= '&') goto yy90;
+		goto yy218;
 	} else {
-		if (yych == '\\') goto yy160;
-		goto yy89;
+		if (yych == '\\') goto yy162;
+		goto yy90;
 	}
-yy161:
+yy163:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == '>') goto yy88;
-	goto yy85;
-yy162:
+	if (yych == '>') goto yy89;
+	goto yy86;
+yy164:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == '=') goto yy88;
-	goto yy85;
-yy163:
+	if (yych == '=') goto yy89;
+	goto yy86;
+yy165:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '^') {
-		if (yych <= '@') goto yy68;
-		if (yych <= 'Z') goto yy216;
-		goto yy68;
+		if (yych <= '@') goto yy69;
+		if (yych <= 'Z') goto yy219;
+		goto yy69;
 	} else {
-		if (yych == '`') goto yy68;
-		if (yych <= 'z') goto yy216;
-		goto yy68;
+		if (yych == '`') goto yy69;
+		if (yych <= 'z') goto yy219;
+		goto yy69;
 	}
-yy164:
+yy166:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '>') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy218;
+			if (yych == '!') goto yy221;
 		} else {
-			if (yych <= '9') goto yy164;
-			if (yych == '=') goto yy218;
+			if (yych <= '9') goto yy166;
+			if (yych == '=') goto yy221;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '?') goto yy218;
-			if (yych <= '@') goto yy165;
-			if (yych <= 'Z') goto yy164;
+			if (yych <= '?') goto yy221;
+			if (yych <= '@') goto yy167;
+			if (yych <= 'Z') goto yy166;
 		} else {
-			if (yych == '`') goto yy165;
-			if (yych <= 'z') goto yy164;
+			if (yych == '`') goto yy167;
+			if (yych <= 'z') goto yy166;
 		}
 	}
-yy165:
-#line 126 "ext/rbs_extension/lexer.re"
+yy167:
+#line 127 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tSYMBOL); }
-#line 1456 "ext/rbs_extension/lexer.c"
-yy166:
+#line 1466 "ext/rbs_extension/lexer.c"
+yy168:
 	rbs_skip(state);
-	goto yy98;
-yy167:
+	goto yy99;
+yy169:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= 'Z') {
-		if (yych <= '/') goto yy168;
-		if (yych <= '9') goto yy167;
-		if (yych >= 'A') goto yy167;
+		if (yych <= '/') goto yy170;
+		if (yych <= '9') goto yy169;
+		if (yych >= 'A') goto yy169;
 	} else {
 		if (yych <= '_') {
-			if (yych >= '_') goto yy167;
+			if (yych >= '_') goto yy169;
 		} else {
-			if (yych <= '`') goto yy168;
-			if (yych <= 'z') goto yy167;
+			if (yych <= '`') goto yy170;
+			if (yych <= 'z') goto yy169;
 		}
 	}
-yy168:
-#line 140 "ext/rbs_extension/lexer.re"
+yy170:
+#line 141 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tA2IDENT); }
-#line 1478 "ext/rbs_extension/lexer.c"
-yy169:
+#line 1488 "ext/rbs_extension/lexer.c"
+yy171:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 's') goto yy219;
-	goto yy105;
-yy170:
+	if (yych == 's') goto yy222;
+	goto yy106;
+yy172:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'o') goto yy221;
-	goto yy112;
-yy171:
+	if (yych == 'o') goto yy224;
+	goto yy113;
+yy173:
 	rbs_skip(state);
 #line 40 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tQIDENT); }
-#line 1493 "ext/rbs_extension/lexer.c"
-yy172:
+#line 1503 "ext/rbs_extension/lexer.c"
+yy174:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'a') goto yy222;
+	if (yych == 'a') goto yy225;
 	goto yy53;
-yy173:
+yy175:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'r') goto yy223;
+	if (yych == 'r') goto yy226;
 	goto yy53;
-yy174:
+yy176:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'l') goto yy224;
+	if (yych == 'l') goto yy227;
 	goto yy53;
-yy175:
+yy177:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy176;
+			if (yych <= '@') goto yy178;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy176;
+			if (yych == '`') goto yy178;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy176:
+yy178:
 #line 72 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kBOT); }
-#line 1531 "ext/rbs_extension/lexer.c"
-yy177:
+#line 1541 "ext/rbs_extension/lexer.c"
+yy179:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 's') goto yy226;
+	if (yych == 's') goto yy229;
 	goto yy53;
-yy178:
+yy180:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy179;
+			if (yych <= '@') goto yy181;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy179;
+			if (yych == '`') goto yy181;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy179:
+yy181:
 #line 74 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kDEF); }
-#line 1559 "ext/rbs_extension/lexer.c"
-yy180:
+#line 1569 "ext/rbs_extension/lexer.c"
+yy182:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy181;
+			if (yych <= '@') goto yy183;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy181;
+			if (yych == '`') goto yy183;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy181:
+yy183:
 #line 75 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kEND); }
-#line 1582 "ext/rbs_extension/lexer.c"
-yy182:
+#line 1592 "ext/rbs_extension/lexer.c"
+yy184:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy227;
+	if (yych == 'e') goto yy230;
 	goto yy53;
-yy183:
+yy185:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 's') goto yy228;
+	if (yych == 's') goto yy231;
 	goto yy53;
-yy184:
+yy186:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'l') goto yy229;
+	if (yych == 'l') goto yy232;
 	goto yy53;
-yy185:
+yy187:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 't') goto yy230;
+	if (yych == 't') goto yy233;
 	goto yy53;
-yy186:
+yy188:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy231;
+	if (yych == 'e') goto yy234;
 	goto yy53;
-yy187:
+yy189:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'u') goto yy232;
+	if (yych == 'u') goto yy235;
 	goto yy53;
-yy188:
+yy190:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy189;
+			if (yych <= '@') goto yy191;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy189;
+			if (yych == '`') goto yy191;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy189:
+yy191:
 #line 83 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kNIL); }
-#line 1635 "ext/rbs_extension/lexer.c"
-yy190:
+#line 1645 "ext/rbs_extension/lexer.c"
+yy192:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy191;
+			if (yych <= '@') goto yy193;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy191;
+			if (yych == '`') goto yy193;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy191:
+yy193:
 #line 84 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kOUT); }
-#line 1658 "ext/rbs_extension/lexer.c"
-yy192:
+#line 1668 "ext/rbs_extension/lexer.c"
+yy194:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'p') goto yy233;
+	if (yych == 'p') goto yy236;
 	goto yy53;
-yy193:
+yy195:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'v') goto yy234;
+	if (yych == 'v') goto yy237;
 	goto yy53;
-yy194:
+yy196:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'l') goto yy235;
+	if (yych == 'l') goto yy238;
 	goto yy53;
-yy195:
+yy197:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'f') goto yy236;
+	if (yych == 'u') goto yy239;
 	goto yy53;
-yy196:
+yy198:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'g') goto yy238;
+	if (yych == 'f') goto yy240;
 	goto yy53;
-yy197:
+yy199:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'p') goto yy239;
+	if (yych == 'g') goto yy242;
 	goto yy53;
-yy198:
+yy200:
+	rbs_skip(state);
+	yych = peek(state);
+	if (yych == 'p') goto yy243;
+	goto yy53;
+yy201:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy199;
+			if (yych <= '@') goto yy202;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy199;
+			if (yych == '`') goto yy202;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy199:
+yy202:
 #line 90 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kTOP); }
-#line 1711 "ext/rbs_extension/lexer.c"
-yy200:
+#line 1726 "ext/rbs_extension/lexer.c"
+yy203:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy241;
+	if (yych == 'e') goto yy245;
 	goto yy53;
-yy201:
+yy204:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy243;
+	if (yych == 'e') goto yy247;
 	goto yy53;
-yy202:
+yy205:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'h') goto yy245;
+	if (yych == 'h') goto yy249;
 	goto yy53;
-yy203:
+yy206:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'y') goto yy246;
+	if (yych == 'y') goto yy250;
 	goto yy53;
-yy204:
+yy207:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy205;
+			if (yych <= '@') goto yy208;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy205;
+			if (yych == '`') goto yy208;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy205:
+yy208:
 #line 96 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kUSE); }
-#line 1754 "ext/rbs_extension/lexer.c"
-yy206:
+#line 1769 "ext/rbs_extension/lexer.c"
+yy209:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'd') goto yy247;
+	if (yych == 'd') goto yy251;
 	goto yy53;
-yy207:
+yy210:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '@') {
-		if (yych <= '/') goto yy68;
-		if (yych <= '9') goto yy249;
-		goto yy68;
+		if (yych <= '/') goto yy69;
+		if (yych <= '9') goto yy253;
+		goto yy69;
 	} else {
-		if (yych <= 'F') goto yy249;
-		if (yych <= '`') goto yy68;
-		if (yych <= 'f') goto yy249;
-		goto yy68;
+		if (yych <= 'F') goto yy253;
+		if (yych <= '`') goto yy69;
+		if (yych <= 'f') goto yy253;
+		goto yy69;
 	}
-yy208:
+yy211:
 	rbs_skip(state);
 #line 55 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tANNOTATION); }
-#line 1777 "ext/rbs_extension/lexer.c"
-yy209:
+#line 1792 "ext/rbs_extension/lexer.c"
+yy212:
 	rbs_skip(state);
 #line 58 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tANNOTATION); }
-#line 1782 "ext/rbs_extension/lexer.c"
-yy210:
+#line 1797 "ext/rbs_extension/lexer.c"
+yy213:
 	rbs_skip(state);
 #line 56 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tANNOTATION); }
-#line 1787 "ext/rbs_extension/lexer.c"
-yy211:
+#line 1802 "ext/rbs_extension/lexer.c"
+yy214:
 	rbs_skip(state);
 #line 54 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tANNOTATION); }
-#line 1792 "ext/rbs_extension/lexer.c"
-yy212:
+#line 1807 "ext/rbs_extension/lexer.c"
+yy215:
 	rbs_skip(state);
 #line 57 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tANNOTATION); }
-#line 1797 "ext/rbs_extension/lexer.c"
-yy213:
+#line 1812 "ext/rbs_extension/lexer.c"
+yy216:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '@') {
-		if (yych <= '/') goto yy68;
-		if (yych <= '9') goto yy250;
-		goto yy68;
+		if (yych <= '/') goto yy69;
+		if (yych <= '9') goto yy254;
+		goto yy69;
 	} else {
-		if (yych <= 'F') goto yy250;
-		if (yych <= '`') goto yy68;
-		if (yych <= 'f') goto yy250;
-		goto yy68;
+		if (yych <= 'F') goto yy254;
+		if (yych <= '`') goto yy69;
+		if (yych <= 'f') goto yy254;
+		goto yy69;
 	}
-yy214:
+yy217:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych <= '/') goto yy68;
-	if (yych <= '9') goto yy86;
-	if (yych <= '`') goto yy68;
-	if (yych <= 'f') goto yy86;
-	goto yy68;
-yy215:
+	if (yych <= '/') goto yy69;
+	if (yych <= '9') goto yy87;
+	if (yych <= '`') goto yy69;
+	if (yych <= 'f') goto yy87;
+	goto yy69;
+yy218:
 	yyaccept = 6;
 	rbs_skip(state);
 	backup = *state;
 	yych = peek(state);
 	if (yych <= '\'') {
-		if (yych <= 0x00000000) goto yy159;
-		if (yych <= '&') goto yy89;
-		goto yy158;
+		if (yych <= 0x00000000) goto yy161;
+		if (yych <= '&') goto yy90;
+		goto yy160;
 	} else {
-		if (yych == '\\') goto yy160;
-		goto yy89;
+		if (yych == '\\') goto yy162;
+		goto yy90;
 	}
-yy216:
+yy219:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '>') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy251;
+			if (yych == '!') goto yy255;
 		} else {
-			if (yych <= '9') goto yy216;
-			if (yych == '=') goto yy251;
+			if (yych <= '9') goto yy219;
+			if (yych == '=') goto yy255;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '?') goto yy251;
-			if (yych <= '@') goto yy217;
-			if (yych <= 'Z') goto yy216;
+			if (yych <= '?') goto yy255;
+			if (yych <= '@') goto yy220;
+			if (yych <= 'Z') goto yy219;
 		} else {
-			if (yych == '`') goto yy217;
-			if (yych <= 'z') goto yy216;
+			if (yych == '`') goto yy220;
+			if (yych <= 'z') goto yy219;
 		}
 	}
-yy217:
-#line 127 "ext/rbs_extension/lexer.re"
+yy220:
+#line 128 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, tSYMBOL); }
-#line 1855 "ext/rbs_extension/lexer.c"
-yy218:
+#line 1870 "ext/rbs_extension/lexer.c"
+yy221:
 	rbs_skip(state);
-	goto yy165;
-yy219:
+	goto yy167;
+yy222:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= 'Z') {
-		if (yych <= '/') goto yy220;
-		if (yych <= '9') goto yy104;
-		if (yych >= 'A') goto yy104;
+		if (yych <= '/') goto yy223;
+		if (yych <= '9') goto yy105;
+		if (yych >= 'A') goto yy105;
 	} else {
 		if (yych <= '_') {
-			if (yych >= '_') goto yy104;
+			if (yych >= '_') goto yy105;
 		} else {
-			if (yych <= '`') goto yy220;
-			if (yych <= 'z') goto yy104;
+			if (yych <= '`') goto yy223;
+			if (yych <= 'z') goto yy105;
 		}
 	}
-yy220:
+yy223:
 #line 99 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kATRBS); }
-#line 1877 "ext/rbs_extension/lexer.c"
-yy221:
+#line 1892 "ext/rbs_extension/lexer.c"
+yy224:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'd') goto yy252;
-	goto yy112;
-yy222:
+	if (yych == 'd') goto yy256;
+	goto yy113;
+yy225:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 's') goto yy253;
+	if (yych == 's') goto yy257;
 	goto yy53;
-yy223:
+yy226:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == '_') goto yy255;
+	if (yych == '_') goto yy259;
 	goto yy53;
-yy224:
+yy227:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy225;
+			if (yych <= '@') goto yy228;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy225;
+			if (yych == '`') goto yy228;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy225:
+yy228:
 #line 71 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kBOOL); }
-#line 1915 "ext/rbs_extension/lexer.c"
-yy226:
+#line 1930 "ext/rbs_extension/lexer.c"
+yy229:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 's') goto yy256;
+	if (yych == 's') goto yy260;
 	goto yy53;
-yy227:
+yy230:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'n') goto yy258;
+	if (yych == 'n') goto yy262;
 	goto yy53;
-yy228:
+yy231:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy259;
+	if (yych == 'e') goto yy263;
 	goto yy53;
-yy229:
+yy232:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'u') goto yy261;
+	if (yych == 'u') goto yy265;
 	goto yy53;
-yy230:
+yy233:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'a') goto yy262;
+	if (yych == 'a') goto yy266;
 	goto yy53;
-yy231:
+yy234:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'r') goto yy263;
+	if (yych == 'r') goto yy267;
 	goto yy53;
-yy232:
+yy235:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'l') goto yy264;
+	if (yych == 'l') goto yy268;
 	goto yy53;
-yy233:
+yy236:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy265;
+	if (yych == 'e') goto yy269;
 	goto yy53;
-yy234:
+yy237:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'a') goto yy266;
+	if (yych == 'a') goto yy270;
 	goto yy53;
-yy235:
+yy238:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'i') goto yy267;
+	if (yych == 'i') goto yy271;
 	goto yy53;
-yy236:
+yy239:
+	rbs_skip(state);
+	yych = peek(state);
+	if (yych == 'r') goto yy272;
+	goto yy53;
+yy240:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy237;
+			if (yych <= '@') goto yy241;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy237;
+			if (yych == '`') goto yy241;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy237:
+yy241:
 #line 88 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kSELF); }
-#line 1988 "ext/rbs_extension/lexer.c"
-yy238:
+#line 2008 "ext/rbs_extension/lexer.c"
+yy242:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'l') goto yy268;
+	if (yych == 'l') goto yy273;
 	goto yy53;
-yy239:
+yy243:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy240;
+			if (yych <= '@') goto yy244;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy240;
+			if (yych == '`') goto yy244;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy240:
+yy244:
 #line 100 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kSKIP); }
-#line 2016 "ext/rbs_extension/lexer.c"
-yy241:
+#line 2036 "ext/rbs_extension/lexer.c"
+yy245:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy242;
+			if (yych <= '@') goto yy246;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy242;
+			if (yych == '`') goto yy246;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy242:
+yy246:
 #line 91 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kTRUE); }
-#line 2039 "ext/rbs_extension/lexer.c"
-yy243:
+#line 2059 "ext/rbs_extension/lexer.c"
+yy247:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy244;
+			if (yych <= '@') goto yy248;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy244;
+			if (yych == '`') goto yy248;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy244:
+yy248:
 #line 92 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kTYPE); }
-#line 2062 "ext/rbs_extension/lexer.c"
-yy245:
+#line 2082 "ext/rbs_extension/lexer.c"
+yy249:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy269;
+	if (yych == 'e') goto yy274;
 	goto yy53;
-yy246:
+yy250:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'p') goto yy270;
+	if (yych == 'p') goto yy275;
 	goto yy53;
-yy247:
+yy251:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy248;
+			if (yych <= '@') goto yy252;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy248;
+			if (yych == '`') goto yy252;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy248:
+yy252:
 #line 95 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kVOID); }
-#line 2095 "ext/rbs_extension/lexer.c"
-yy249:
+#line 2115 "ext/rbs_extension/lexer.c"
+yy253:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '@') {
-		if (yych <= '/') goto yy68;
-		if (yych <= '9') goto yy271;
-		goto yy68;
+		if (yych <= '/') goto yy69;
+		if (yych <= '9') goto yy276;
+		goto yy69;
 	} else {
-		if (yych <= 'F') goto yy271;
-		if (yych <= '`') goto yy68;
-		if (yych <= 'f') goto yy271;
-		goto yy68;
+		if (yych <= 'F') goto yy276;
+		if (yych <= '`') goto yy69;
+		if (yych <= 'f') goto yy276;
+		goto yy69;
 	}
-yy250:
+yy254:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '@') {
-		if (yych <= '/') goto yy68;
-		if (yych <= '9') goto yy272;
-		goto yy68;
+		if (yych <= '/') goto yy69;
+		if (yych <= '9') goto yy277;
+		goto yy69;
 	} else {
-		if (yych <= 'F') goto yy272;
-		if (yych <= '`') goto yy68;
-		if (yych <= 'f') goto yy272;
-		goto yy68;
+		if (yych <= 'F') goto yy277;
+		if (yych <= '`') goto yy69;
+		if (yych <= 'f') goto yy277;
+		goto yy69;
 	}
-yy251:
+yy255:
 	rbs_skip(state);
-	goto yy217;
-yy252:
+	goto yy220;
+yy256:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'o') goto yy273;
-	goto yy112;
-yy253:
+	if (yych == 'o') goto yy278;
+	goto yy113;
+yy257:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy254;
+			if (yych <= '@') goto yy258;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy254;
+			if (yych == '`') goto yy258;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy254:
+yy258:
 #line 67 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kALIAS); }
-#line 2152 "ext/rbs_extension/lexer.c"
-yy255:
+#line 2172 "ext/rbs_extension/lexer.c"
+yy259:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= 'q') {
-		if (yych == 'a') goto yy274;
+		if (yych == 'a') goto yy279;
 		goto yy53;
 	} else {
-		if (yych <= 'r') goto yy275;
-		if (yych == 'w') goto yy276;
+		if (yych <= 'r') goto yy280;
+		if (yych == 'w') goto yy281;
 		goto yy53;
 	}
-yy256:
+yy260:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy257;
+			if (yych <= '@') goto yy261;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy257;
+			if (yych == '`') goto yy261;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy257:
+yy261:
 #line 73 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kCLASS); }
-#line 2186 "ext/rbs_extension/lexer.c"
-yy258:
+#line 2206 "ext/rbs_extension/lexer.c"
+yy262:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'd') goto yy277;
+	if (yych == 'd') goto yy282;
 	goto yy53;
-yy259:
+yy263:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy260;
+			if (yych <= '@') goto yy264;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy260;
+			if (yych == '`') goto yy264;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy260:
+yy264:
 #line 77 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kFALSE); }
-#line 2214 "ext/rbs_extension/lexer.c"
-yy261:
+#line 2234 "ext/rbs_extension/lexer.c"
+yy265:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'd') goto yy279;
+	if (yych == 'd') goto yy284;
 	goto yy53;
-yy262:
+yy266:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'n') goto yy280;
+	if (yych == 'n') goto yy285;
 	goto yy53;
-yy263:
+yy267:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'f') goto yy281;
+	if (yych == 'f') goto yy286;
 	goto yy53;
-yy264:
+yy268:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy282;
+	if (yych == 'e') goto yy287;
 	goto yy53;
-yy265:
+yy269:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'n') goto yy284;
+	if (yych == 'n') goto yy289;
 	goto yy53;
-yy266:
+yy270:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 't') goto yy285;
+	if (yych == 't') goto yy290;
 	goto yy53;
-yy267:
+yy271:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'c') goto yy286;
+	if (yych == 'c') goto yy291;
 	goto yy53;
-yy268:
+yy272:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy288;
+	if (yych == 'n') goto yy293;
 	goto yy53;
-yy269:
+yy273:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'c') goto yy289;
+	if (yych == 'e') goto yy295;
 	goto yy53;
-yy270:
+yy274:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy290;
+	if (yych == 'c') goto yy296;
 	goto yy53;
-yy271:
+yy275:
+	rbs_skip(state);
+	yych = peek(state);
+	if (yych == 'e') goto yy297;
+	goto yy53;
+yy276:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '@') {
-		if (yych <= '/') goto yy68;
-		if (yych <= '9') goto yy66;
-		goto yy68;
+		if (yych <= '/') goto yy69;
+		if (yych <= '9') goto yy67;
+		goto yy69;
 	} else {
-		if (yych <= 'F') goto yy66;
-		if (yych <= '`') goto yy68;
-		if (yych <= 'f') goto yy66;
-		goto yy68;
+		if (yych <= 'F') goto yy67;
+		if (yych <= '`') goto yy69;
+		if (yych <= 'f') goto yy67;
+		goto yy69;
 	}
-yy272:
+yy277:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '@') {
-		if (yych <= '/') goto yy68;
-		if (yych <= '9') goto yy291;
-		goto yy68;
+		if (yych <= '/') goto yy69;
+		if (yych <= '9') goto yy298;
+		goto yy69;
 	} else {
-		if (yych <= 'F') goto yy291;
-		if (yych <= '`') goto yy68;
-		if (yych <= 'f') goto yy291;
-		goto yy68;
+		if (yych <= 'F') goto yy298;
+		if (yych <= '`') goto yy69;
+		if (yych <= 'f') goto yy298;
+		goto yy69;
 	}
-yy273:
+yy278:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == '_') goto yy292;
-	goto yy112;
-yy274:
+	if (yych == '_') goto yy299;
+	goto yy113;
+yy279:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'c') goto yy293;
+	if (yych == 'c') goto yy300;
 	goto yy53;
-yy275:
+yy280:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy294;
+	if (yych == 'e') goto yy301;
 	goto yy53;
-yy276:
+yy281:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'r') goto yy295;
+	if (yych == 'r') goto yy302;
 	goto yy53;
-yy277:
+yy282:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy278;
+			if (yych <= '@') goto yy283;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy278;
+			if (yych == '`') goto yy283;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy278:
+yy283:
 #line 76 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kEXTEND); }
-#line 2333 "ext/rbs_extension/lexer.c"
-yy279:
+#line 2358 "ext/rbs_extension/lexer.c"
+yy284:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy296;
+	if (yych == 'e') goto yy303;
 	goto yy53;
-yy280:
+yy285:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'c') goto yy298;
+	if (yych == 'c') goto yy305;
 	goto yy53;
-yy281:
+yy286:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'a') goto yy299;
+	if (yych == 'a') goto yy306;
 	goto yy53;
-yy282:
+yy287:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy283;
+			if (yych <= '@') goto yy288;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy283;
+			if (yych == '`') goto yy288;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy283:
+yy288:
 #line 82 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kMODULE); }
-#line 2371 "ext/rbs_extension/lexer.c"
-yy284:
+#line 2396 "ext/rbs_extension/lexer.c"
+yy289:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'd') goto yy300;
+	if (yych == 'd') goto yy307;
 	goto yy53;
-yy285:
+yy290:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy302;
+	if (yych == 'e') goto yy309;
 	goto yy53;
-yy286:
+yy291:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy287;
+			if (yych <= '@') goto yy292;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy287;
+			if (yych == '`') goto yy292;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy287:
+yy292:
 #line 87 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kPUBLIC); }
-#line 2404 "ext/rbs_extension/lexer.c"
-yy288:
+#line 2429 "ext/rbs_extension/lexer.c"
+yy293:
+	rbs_skip(state);
+	yych = peek(state);
+	if (yych <= '=') {
+		if (yych <= '/') {
+			if (yych == '!') goto yy109;
+		} else {
+			if (yych <= '9') goto yy52;
+			if (yych >= '=') goto yy110;
+		}
+	} else {
+		if (yych <= '^') {
+			if (yych <= '@') goto yy294;
+			if (yych <= 'Z') goto yy52;
+		} else {
+			if (yych == '`') goto yy294;
+			if (yych <= 'z') goto yy52;
+		}
+	}
+yy294:
+#line 101 "ext/rbs_extension/lexer.re"
+	{ return next_token(state, kRETURN); }
+#line 2452 "ext/rbs_extension/lexer.c"
+yy295:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 't') goto yy304;
+	if (yych == 't') goto yy311;
 	goto yy53;
-yy289:
+yy296:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'k') goto yy305;
+	if (yych == 'k') goto yy312;
 	goto yy53;
-yy290:
+yy297:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'd') goto yy306;
+	if (yych == 'd') goto yy313;
 	goto yy53;
-yy291:
+yy298:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '@') {
-		if (yych <= '/') goto yy68;
-		if (yych <= '9') goto yy86;
-		goto yy68;
+		if (yych <= '/') goto yy69;
+		if (yych <= '9') goto yy87;
+		goto yy69;
 	} else {
-		if (yych <= 'F') goto yy86;
-		if (yych <= '`') goto yy68;
-		if (yych <= 'f') goto yy86;
-		goto yy68;
+		if (yych <= 'F') goto yy87;
+		if (yych <= '`') goto yy69;
+		if (yych <= 'f') goto yy87;
+		goto yy69;
 	}
-yy292:
+yy299:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == '_') goto yy308;
-	goto yy112;
-yy293:
+	if (yych == '_') goto yy315;
+	goto yy113;
+yy300:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'c') goto yy310;
+	if (yych == 'c') goto yy317;
 	goto yy53;
-yy294:
+yy301:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'a') goto yy311;
+	if (yych == 'a') goto yy318;
 	goto yy53;
-yy295:
+yy302:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'i') goto yy312;
+	if (yych == 'i') goto yy319;
 	goto yy53;
-yy296:
+yy303:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy297;
+			if (yych <= '@') goto yy304;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy297;
+			if (yych == '`') goto yy304;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy297:
+yy304:
 #line 79 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kINCLUDE); }
-#line 2475 "ext/rbs_extension/lexer.c"
-yy298:
+#line 2523 "ext/rbs_extension/lexer.c"
+yy305:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy313;
+	if (yych == 'e') goto yy320;
 	goto yy53;
-yy299:
+yy306:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'c') goto yy315;
+	if (yych == 'c') goto yy322;
 	goto yy53;
-yy300:
+yy307:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy301;
+			if (yych <= '@') goto yy308;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy301;
+			if (yych == '`') goto yy308;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy301:
+yy308:
 #line 85 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kPREPEND); }
-#line 2508 "ext/rbs_extension/lexer.c"
-yy302:
+#line 2556 "ext/rbs_extension/lexer.c"
+yy309:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy303;
+			if (yych <= '@') goto yy310;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy303;
+			if (yych == '`') goto yy310;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy303:
+yy310:
 #line 86 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kPRIVATE); }
-#line 2531 "ext/rbs_extension/lexer.c"
-yy304:
+#line 2579 "ext/rbs_extension/lexer.c"
+yy311:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'o') goto yy316;
+	if (yych == 'o') goto yy323;
 	goto yy53;
-yy305:
+yy312:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy317;
+	if (yych == 'e') goto yy324;
 	goto yy53;
-yy306:
+yy313:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy307;
+			if (yych <= '@') goto yy314;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy307;
+			if (yych == '`') goto yy314;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy307:
+yy314:
 #line 94 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kUNTYPED); }
-#line 2564 "ext/rbs_extension/lexer.c"
-yy308:
+#line 2612 "ext/rbs_extension/lexer.c"
+yy315:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
-			if (yych <= '9') goto yy111;
-			if (yych >= '=') goto yy109;
+			if (yych <= '9') goto yy112;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy309;
-			if (yych <= 'Z') goto yy111;
+			if (yych <= '@') goto yy316;
+			if (yych <= 'Z') goto yy112;
 		} else {
-			if (yych == '`') goto yy309;
-			if (yych <= 'z') goto yy111;
+			if (yych == '`') goto yy316;
+			if (yych <= 'z') goto yy112;
 		}
 	}
-yy309:
+yy316:
 #line 98 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, k__TODO__); }
-#line 2587 "ext/rbs_extension/lexer.c"
-yy310:
+#line 2635 "ext/rbs_extension/lexer.c"
+yy317:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy318;
+	if (yych == 'e') goto yy325;
 	goto yy53;
-yy311:
+yy318:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'd') goto yy319;
+	if (yych == 'd') goto yy326;
 	goto yy53;
-yy312:
+yy319:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 't') goto yy320;
+	if (yych == 't') goto yy327;
 	goto yy53;
-yy313:
+yy320:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy314;
+			if (yych <= '@') goto yy321;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy314;
+			if (yych == '`') goto yy321;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy314:
+yy321:
 #line 80 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kINSTANCE); }
-#line 2625 "ext/rbs_extension/lexer.c"
-yy315:
+#line 2673 "ext/rbs_extension/lexer.c"
+yy322:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy321;
+	if (yych == 'e') goto yy328;
 	goto yy53;
-yy316:
+yy323:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'n') goto yy323;
+	if (yych == 'n') goto yy330;
 	goto yy53;
-yy317:
+yy324:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'd') goto yy325;
+	if (yych == 'd') goto yy332;
 	goto yy53;
-yy318:
+yy325:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 's') goto yy327;
+	if (yych == 's') goto yy334;
 	goto yy53;
-yy319:
+yy326:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy328;
+	if (yych == 'e') goto yy335;
 	goto yy53;
-yy320:
+yy327:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'e') goto yy329;
+	if (yych == 'e') goto yy336;
 	goto yy53;
-yy321:
+yy328:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy322;
+			if (yych <= '@') goto yy329;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy322;
+			if (yych == '`') goto yy329;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy322:
+yy329:
 #line 81 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kINTERFACE); }
-#line 2678 "ext/rbs_extension/lexer.c"
-yy323:
+#line 2726 "ext/rbs_extension/lexer.c"
+yy330:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy324;
+			if (yych <= '@') goto yy331;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy324;
+			if (yych == '`') goto yy331;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy324:
+yy331:
 #line 89 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kSINGLETON); }
-#line 2701 "ext/rbs_extension/lexer.c"
-yy325:
+#line 2749 "ext/rbs_extension/lexer.c"
+yy332:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy326;
+			if (yych <= '@') goto yy333;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy326;
+			if (yych == '`') goto yy333;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy326:
+yy333:
 #line 93 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kUNCHECKED); }
-#line 2724 "ext/rbs_extension/lexer.c"
-yy327:
+#line 2772 "ext/rbs_extension/lexer.c"
+yy334:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 's') goto yy330;
+	if (yych == 's') goto yy337;
 	goto yy53;
-yy328:
+yy335:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'r') goto yy331;
+	if (yych == 'r') goto yy338;
 	goto yy53;
-yy329:
+yy336:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'r') goto yy333;
+	if (yych == 'r') goto yy340;
 	goto yy53;
-yy330:
+yy337:
 	rbs_skip(state);
 	yych = peek(state);
-	if (yych == 'o') goto yy335;
+	if (yych == 'o') goto yy342;
 	goto yy53;
-yy331:
+yy338:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy332;
+			if (yych <= '@') goto yy339;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy332;
+			if (yych == '`') goto yy339;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy332:
+yy339:
 #line 69 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kATTRREADER); }
-#line 2767 "ext/rbs_extension/lexer.c"
-yy333:
+#line 2815 "ext/rbs_extension/lexer.c"
+yy340:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy334;
+			if (yych <= '@') goto yy341;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy334;
+			if (yych == '`') goto yy341;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy334:
+yy341:
 #line 70 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kATTRWRITER); }
-#line 2790 "ext/rbs_extension/lexer.c"
-yy335:
+#line 2838 "ext/rbs_extension/lexer.c"
+yy342:
 	rbs_skip(state);
 	yych = peek(state);
 	if (yych != 'r') goto yy53;
@@ -2795,25 +2843,25 @@ token rbsparser_next_token(lexstate *state) {
 	yych = peek(state);
 	if (yych <= '=') {
 		if (yych <= '/') {
-			if (yych == '!') goto yy108;
+			if (yych == '!') goto yy109;
 		} else {
 			if (yych <= '9') goto yy52;
-			if (yych >= '=') goto yy109;
+			if (yych >= '=') goto yy110;
 		}
 	} else {
 		if (yych <= '^') {
-			if (yych <= '@') goto yy336;
+			if (yych <= '@') goto yy343;
 			if (yych <= 'Z') goto yy52;
 		} else {
-			if (yych == '`') goto yy336;
+			if (yych == '`') goto yy343;
 			if (yych <= 'z') goto yy52;
 		}
 	}
-yy336:
+yy343:
 #line 68 "ext/rbs_extension/lexer.re"
 	{ return next_token(state, kATTRACCESSOR); }
-#line 2816 "ext/rbs_extension/lexer.c"
+#line 2864 "ext/rbs_extension/lexer.c"
 }
-#line 149 "ext/rbs_extension/lexer.re"
+#line 150 "ext/rbs_extension/lexer.re"
 
 }
diff --git a/ext/rbs_extension/lexer.h b/ext/rbs_extension/lexer.h
index 6a0d71b8b..b073f373d 100644
--- a/ext/rbs_extension/lexer.h
+++ b/ext/rbs_extension/lexer.h
@@ -63,6 +63,7 @@ enum TokenType {
   k__TODO__,        /* __todo__ */
   kATRBS,           /* @rbs */
   kSKIP,            /* skip */
+  kRETURN,          /* return */
 
   tLIDENT,          /* Identifiers starting with lower case */
   tUIDENT,          /* Identifiers starting with upper case */
diff --git a/ext/rbs_extension/lexer.re b/ext/rbs_extension/lexer.re
index ef0e09503..cbcef13bd 100644
--- a/ext/rbs_extension/lexer.re
+++ b/ext/rbs_extension/lexer.re
@@ -98,6 +98,7 @@ token rbsparser_next_token(lexstate *state) {
       "__todo__"      { return next_token(state, k__TODO__); }
       "@rbs"          { return next_token(state, kATRBS); }
       "skip"          { return next_token(state, kSKIP); }
+      "return"        { return next_token(state, kRETURN); }
 
       unicode_char = "\\u" [0-9a-fA-F]{4};
       oct_char = "\\x" [0-9a-f]{1,2};
diff --git a/ext/rbs_extension/lexstate.c b/ext/rbs_extension/lexstate.c
index cb1cc7234..1d20a3f81 100644
--- a/ext/rbs_extension/lexstate.c
+++ b/ext/rbs_extension/lexstate.c
@@ -62,6 +62,7 @@ static const char *RBS_TOKENTYPE_NAMES[] = {
   "k__TODO__",        /* __todo__ */
   "kATRBS",           /* @rbs */
   "kSKIP",            /* skip */
+  "kRETURN",          /* return */
 
   "tLIDENT",          /* Identifiers starting with lower case */
   "tUIDENT",          /* Identifiers starting with upper case */
diff --git a/ext/rbs_extension/parser.c b/ext/rbs_extension/parser.c
index 9b2758a73..78b50b0b8 100644
--- a/ext/rbs_extension/parser.c
+++ b/ext/rbs_extension/parser.c
@@ -49,6 +49,7 @@
   case kAS: \
   case k__TODO__: \
   case kSKIP: \
+  case kRETURN: \
   /* nop */
 
 typedef struct {
@@ -190,6 +191,7 @@ static VALUE parse_type_name(parserstate *state, TypeNameKind kind, range *rg) {
   switch (state->current_token.type) {
     case tLIDENT:
     case kSKIP:
+    case kRETURN:
       if (kind & ALIAS_NAME) goto success;
       goto error;
     case tULIDENT:
@@ -901,6 +903,7 @@ static VALUE parse_instance_type(parserstate *state, bool parse_alias) {
         break;
       }
       case kSKIP:
+      case kRETURN:
       case tLIDENT: {
         kind = ALIAS_NAME;
         break;
@@ -1065,6 +1068,7 @@ static VALUE parse_simple(parserstate *state) {
   case tULIDENT: // fallthrough
   case tLIDENT: // fallthrough
   case kSKIP: // fallthrough
+  case kRETURN: // fallthrough
   case pCOLON2: {
     return parse_instance_type(state, true);
   }
@@ -2988,6 +2992,26 @@ static VALUE parse_inline_leading_annotation(parserstate *state) {
             comment_loc
           );
         }
+        case kRETURN: {
+          parser_advance(state);
+
+          range return_loc = state->current_token.range;
+          parser_advance_assert(state, pCOLON);
+          range colon_loc = state->current_token.range;
+
+          VALUE return_type = parse_type(state);
+
+          VALUE comment_loc = parse_inline_comment(state);
+
+          return rbs_ast_ruby_annotations_return_type_annotation(
+            rbs_new_location(state->buffer, (range) { .start = rbs_range.start, .end = state->current_token.range.end }),
+            rbs_new_location(state->buffer, rbs_range),
+            rbs_new_location(state->buffer, return_loc),
+            rbs_new_location(state->buffer, colon_loc),
+            return_type,
+            comment_loc
+          );
+        }
         default: {
           raise_syntax_error(
             state,
diff --git a/include/rbs/constants.h b/include/rbs/constants.h
index 48f5b5457..7fc878e65 100644
--- a/include/rbs/constants.h
+++ b/include/rbs/constants.h
@@ -52,6 +52,7 @@ extern VALUE RBS_AST_Members_Public;
 extern VALUE RBS_AST_Ruby_Annotations_ColonMethodTypeAnnotation;
 extern VALUE RBS_AST_Ruby_Annotations_MethodTypesAnnotation;
 extern VALUE RBS_AST_Ruby_Annotations_NodeTypeAssertion;
+extern VALUE RBS_AST_Ruby_Annotations_ReturnTypeAnnotation;
 extern VALUE RBS_AST_Ruby_Annotations_SkipAnnotation;
 extern VALUE RBS_AST_TypeParam;
 extern VALUE RBS_MethodType;
diff --git a/include/rbs/ruby_objs.h b/include/rbs/ruby_objs.h
index 084391107..b57a21675 100644
--- a/include/rbs/ruby_objs.h
+++ b/include/rbs/ruby_objs.h
@@ -42,6 +42,7 @@ VALUE rbs_ast_members_public(VALUE location);
 VALUE rbs_ast_ruby_annotations_colon_method_type_annotation(VALUE location, VALUE prefix_location, VALUE annotations, VALUE method_type);
 VALUE rbs_ast_ruby_annotations_method_types_annotation(VALUE location, VALUE prefix_location, VALUE overloads, VALUE vertical_bar_locations);
 VALUE rbs_ast_ruby_annotations_node_type_assertion(VALUE location, VALUE prefix_location, VALUE type);
+VALUE rbs_ast_ruby_annotations_return_type_annotation(VALUE location, VALUE prefix_location, VALUE return_location, VALUE colon_location, VALUE return_type, VALUE comment_location);
 VALUE rbs_ast_ruby_annotations_skip_annotation(VALUE location, VALUE prefix_location, VALUE skip_location, VALUE comment_location);
 VALUE rbs_ast_type_param(VALUE name, VALUE variance, VALUE upper_bound, VALUE default_type, VALUE unchecked, VALUE location);
 VALUE rbs_method_type(VALUE type_params, VALUE type, VALUE block, VALUE location);
diff --git a/lib/rbs/ast/ruby/annotations.rb b/lib/rbs/ast/ruby/annotations.rb
index ffb03a180..4de877a25 100644
--- a/lib/rbs/ast/ruby/annotations.rb
+++ b/lib/rbs/ast/ruby/annotations.rb
@@ -84,6 +84,35 @@ def initialize(location:, prefix_location:, skip_location:, comment_location:)
             @comment_location = comment_location
           end
         end
+
+        class ReturnTypeAnnotation < Base
+          attr_reader :return_location
+
+          attr_reader :colon_location
+
+          attr_reader :return_type
+
+          attr_reader :comment_location
+
+          def initialize(location:, prefix_location:, return_location:, colon_location:, return_type:, comment_location:)
+            super(location, prefix_location)
+            @return_location = return_location
+            @colon_location = colon_location
+            @return_type = return_type
+            @comment_location = comment_location
+          end
+
+          def map_type_name(&block)
+            self.class.new(
+              location:,
+              prefix_location:,
+              return_location: return_location,
+              colon_location: colon_location,
+              return_type: return_type.map_type_name { yield _1 },
+              comment_location: comment_location
+            ) #: self
+          end
+        end
       end
     end
   end
diff --git a/lib/rbs/ast/ruby/members.rb b/lib/rbs/ast/ruby/members.rb
index 082d11713..e4cf7d00b 100644
--- a/lib/rbs/ast/ruby/members.rb
+++ b/lib/rbs/ast/ruby/members.rb
@@ -15,6 +15,50 @@ def initialize(buffer)
         end
 
         class MethodTypeAnnotation
+          class DocStyle
+            attr_accessor :return_type_annotation
+
+            def initialize
+              @return_type_annotation = nil
+            end
+
+            def map_type_name(&block)
+              DocStyle.new.tap do |new|
+                new.return_type_annotation = return_type_annotation&.map_type_name(&block)
+              end #: self
+            end
+
+            def method_type
+              return_type =
+                case return_type_annotation
+                when Annotations::NodeTypeAssertion
+                  return_type_annotation.type
+                when Annotations::ReturnTypeAnnotation
+                  return_type_annotation.return_type
+                else
+                  Types::Bases::Any.new(location: nil)
+                end
+
+              type = Types::Function.new(
+                required_positionals: [],
+                optional_positionals: [],
+                rest_positionals: nil,
+                trailing_positionals: [],
+                required_keywords: {},
+                optional_keywords: {},
+                rest_keywords: nil,
+                return_type: return_type
+              )
+
+              MethodType.new(
+                type_params: [],
+                type: type,
+                block: nil,
+                location: nil
+              )
+            end
+          end
+
           attr_reader :type_annotations
 
           def initialize(type_annotations:)
@@ -27,7 +71,7 @@ def map_type_name(&block)
               updated_annots = type_annotations.map do |annotation|
                 annotation.map_type_name(&block)
               end
-            when Annotations::NodeTypeAssertion
+            when DocStyle
               updated_annots = type_annotations.map_type_name(&block)
             end
 
@@ -43,7 +87,8 @@ def self.build(leading_block, trailing_block, variables)
             if trailing_block
               case annotation = trailing_block.trailing_annotation(variables)
               when Annotations::NodeTypeAssertion
-                type_annotations = annotation
+                type_annotations = DocStyle.new()
+                type_annotations.return_type_annotation = annotation
               else
                 unused_trailing_annotation = annotation
               end
@@ -65,6 +110,17 @@ def self.build(leading_block, trailing_block, variables)
                     type_annotations << paragraph
                     next
                   end
+                when Annotations::ReturnTypeAnnotation
+                  unless type_annotations
+                    type_annotations = DocStyle.new()
+                  end
+
+                  if type_annotations.is_a?(DocStyle)
+                    unless type_annotations.return_type_annotation
+                      type_annotations.return_type_annotation = paragraph
+                      next
+                    end
+                  end
                 end
 
                 unused_annotations << paragraph
@@ -86,13 +142,8 @@ def empty?
 
           def overloads
             case type_annotations
-            when Annotations::NodeTypeAssertion
-              method_type = MethodType.new(
-                type_params: [],
-                type: Types::Function.empty(type_annotations.type),
-                block: nil,
-                location: nil
-              )
+            when DocStyle
+              method_type = type_annotations.method_type
 
               [
                 AST::Members::MethodDefinition::Overload.new(annotations: [], method_type: method_type)
diff --git a/sig/ast/ruby/annotations.rbs b/sig/ast/ruby/annotations.rbs
index a27d0146f..18a8cbb9c 100644
--- a/sig/ast/ruby/annotations.rbs
+++ b/sig/ast/ruby/annotations.rbs
@@ -5,6 +5,7 @@ module RBS
         type leading_annotation = ColonMethodTypeAnnotation
                                 | MethodTypesAnnotation
                                 | SkipAnnotation
+                                | ReturnTypeAnnotation
 
         type trailing_annotation = NodeTypeAssertion
 
@@ -73,6 +74,36 @@ module RBS
 
           def initialize: (location: Location, prefix_location: Location, skip_location: Location, comment_location: Location?) -> void
         end
+
+        # `@rbs return: T -- comment` annotation in leading comments
+        #
+        # ```
+        # @rbs return: String -- Returns a string
+        # ^^^                                        -- prefix_location
+        #      ^^^^^^                                -- return_location
+        #            ^                               -- colon_location
+        #                     ^^^^^^^^^^^^^^^^^^^    -- comment
+        # ```
+        class ReturnTypeAnnotation < Base
+          attr_reader return_location: Location
+
+          attr_reader colon_location: Location
+
+          attr_reader return_type: Types::t
+
+          attr_reader comment_location: Location?
+
+          def initialize: (
+            location: Location,
+            prefix_location: Location,
+            return_location: Location,
+            colon_location: Location,
+            return_type: Types::t,
+            comment_location: Location?,
+          ) -> void
+
+          def map_type_name: () { (TypeName) -> TypeName } -> self
+        end
       end
     end
   end
diff --git a/sig/ast/ruby/members.rbs b/sig/ast/ruby/members.rbs
index cf3cebd68..82452460f 100644
--- a/sig/ast/ruby/members.rbs
+++ b/sig/ast/ruby/members.rbs
@@ -13,7 +13,17 @@ module RBS
         type t = DefMember
 
         class MethodTypeAnnotation
-          type type_annotations = Annotations::NodeTypeAssertion | Array[Annotations::ColonMethodTypeAnnotation | Annotations::MethodTypesAnnotation] | nil
+          class DocStyle
+            attr_accessor return_type_annotation: Annotations::ReturnTypeAnnotation | Annotations::NodeTypeAssertion | nil
+
+            def initialize: () -> void
+
+            def map_type_name: () { (TypeName) -> TypeName } -> self
+
+            def method_type: () -> MethodType
+          end
+
+          type type_annotations = DocStyle | Array[Annotations::ColonMethodTypeAnnotation | Annotations::MethodTypesAnnotation] | nil
 
           attr_reader type_annotations: type_annotations
 
diff --git a/src/constants.c b/src/constants.c
index df5d72679..185c4f8ed 100644
--- a/src/constants.c
+++ b/src/constants.c
@@ -52,6 +52,7 @@ VALUE RBS_AST_Members_Public;
 VALUE RBS_AST_Ruby_Annotations_ColonMethodTypeAnnotation;
 VALUE RBS_AST_Ruby_Annotations_MethodTypesAnnotation;
 VALUE RBS_AST_Ruby_Annotations_NodeTypeAssertion;
+VALUE RBS_AST_Ruby_Annotations_ReturnTypeAnnotation;
 VALUE RBS_AST_Ruby_Annotations_SkipAnnotation;
 VALUE RBS_AST_TypeParam;
 VALUE RBS_MethodType;
@@ -132,6 +133,7 @@ void rbs__init_constants(void) {
   IMPORT_CONSTANT(RBS_AST_Ruby_Annotations_ColonMethodTypeAnnotation, RBS_AST_Ruby_Annotations, "ColonMethodTypeAnnotation");
   IMPORT_CONSTANT(RBS_AST_Ruby_Annotations_MethodTypesAnnotation, RBS_AST_Ruby_Annotations, "MethodTypesAnnotation");
   IMPORT_CONSTANT(RBS_AST_Ruby_Annotations_NodeTypeAssertion, RBS_AST_Ruby_Annotations, "NodeTypeAssertion");
+  IMPORT_CONSTANT(RBS_AST_Ruby_Annotations_ReturnTypeAnnotation, RBS_AST_Ruby_Annotations, "ReturnTypeAnnotation");
   IMPORT_CONSTANT(RBS_AST_Ruby_Annotations_SkipAnnotation, RBS_AST_Ruby_Annotations, "SkipAnnotation");
   IMPORT_CONSTANT(RBS_AST_TypeParam, RBS_AST, "TypeParam");
   IMPORT_CONSTANT(RBS_MethodType, RBS, "MethodType");
diff --git a/src/ruby_objs.c b/src/ruby_objs.c
index f7e9dd0b2..1d9fc4753 100644
--- a/src/ruby_objs.c
+++ b/src/ruby_objs.c
@@ -480,6 +480,22 @@ VALUE rbs_ast_ruby_annotations_node_type_assertion(VALUE location, VALUE prefix_
   );
 }
 
+VALUE rbs_ast_ruby_annotations_return_type_annotation(VALUE location, VALUE prefix_location, VALUE return_location, VALUE colon_location, VALUE return_type, VALUE comment_location) {
+  VALUE _init_kwargs = rb_hash_new();
+  rb_hash_aset(_init_kwargs, ID2SYM(rb_intern("location")), location);
+  rb_hash_aset(_init_kwargs, ID2SYM(rb_intern("prefix_location")), prefix_location);
+  rb_hash_aset(_init_kwargs, ID2SYM(rb_intern("return_location")), return_location);
+  rb_hash_aset(_init_kwargs, ID2SYM(rb_intern("colon_location")), colon_location);
+  rb_hash_aset(_init_kwargs, ID2SYM(rb_intern("return_type")), return_type);
+  rb_hash_aset(_init_kwargs, ID2SYM(rb_intern("comment_location")), comment_location);
+
+  return CLASS_NEW_INSTANCE(
+    RBS_AST_Ruby_Annotations_ReturnTypeAnnotation,
+    1,
+    &_init_kwargs
+  );
+}
+
 VALUE rbs_ast_ruby_annotations_skip_annotation(VALUE location, VALUE prefix_location, VALUE skip_location, VALUE comment_location) {
   VALUE _init_kwargs = rb_hash_new();
   rb_hash_aset(_init_kwargs, ID2SYM(rb_intern("location")), location);
diff --git a/test/rbs/inline_annotation_parsing_test.rb b/test/rbs/inline_annotation_parsing_test.rb
index 336e152ca..1fef5ff51 100644
--- a/test/rbs/inline_annotation_parsing_test.rb
+++ b/test/rbs/inline_annotation_parsing_test.rb
@@ -95,4 +95,24 @@ def test_parse__skip
       assert_equal "-- some comment here", annot.comment_location.source
     end
   end
+
+  def test_parse__return
+    Parser.parse_inline_leading_annotation("@rbs return: untyped", 0...).tap do |annot|
+      assert_instance_of AST::Ruby::Annotations::ReturnTypeAnnotation, annot
+      assert_equal "@rbs return: untyped", annot.location.source
+      assert_equal "return", annot.return_location.source
+      assert_equal ":", annot.colon_location.source
+      assert_equal "untyped", annot.return_type.location.source
+      assert_nil annot.comment_location
+    end
+
+    Parser.parse_inline_leading_annotation("@rbs return: untyped -- some comment here", 0...).tap do |annot|
+      assert_instance_of AST::Ruby::Annotations::ReturnTypeAnnotation, annot
+      assert_equal "@rbs return: untyped -- some comment here", annot.location.source
+      assert_equal "return", annot.return_location.source
+      assert_equal ":", annot.colon_location.source
+      assert_equal "untyped", annot.return_type.location.source
+      assert_equal "-- some comment here", annot.comment_location.source
+    end
+  end
 end
diff --git a/test/rbs/inline_parser_test.rb b/test/rbs/inline_parser_test.rb
index 32d4b4393..2090b42a1 100644
--- a/test/rbs/inline_parser_test.rb
+++ b/test/rbs/inline_parser_test.rb
@@ -267,4 +267,24 @@ def foo
       assert_empty decl.members
     end
   end
+
+  def test_parse__return_type
+    result = parse(<<~RUBY)
+      class Foo
+        # @rbs return: void
+        def foo
+        end
+      end
+    RUBY
+
+    assert_empty result.diagnostics
+
+    result.declarations[0].tap do |decl|
+      decl.members[0].tap do |member|
+        assert_instance_of RBS::AST::Ruby::Members::DefMember, member
+        assert_instance_of Array, member.annotations
+        assert_equal ["() -> void"], member.overloads.map { _1.method_type.to_s }
+      end
+    end
+  end
 end
diff --git a/test/rbs/signature_parsing_test.rb b/test/rbs/signature_parsing_test.rb
index f8eb0f974..de7ac56ea 100644
--- a/test/rbs/signature_parsing_test.rb
+++ b/test/rbs/signature_parsing_test.rb
@@ -2304,4 +2304,17 @@ def skip: (untyped skip) -> void
       end
     RBS
   end
+
+  def test_inline_keyword__return
+    Parser.parse_signature(<<~RBS)
+      class Foo
+        def return: (untyped return) -> void
+        attr_reader return: untyped
+
+        type return = untyped
+
+        @foo: Array[return]
+      end
+    RBS
+  end
 end