Manually modify type structure shape to get an unsupported type

Makes it possible to test on 3.12

Author: fredemmott

tests/TypeStructureTest.php

@@ -265,9 +265,10 @@ public function testInvalidTypes<T>(
 
   public function testUnsupportedType(): void {
     $this->expectException(UnsupportedTypeException::class);
-    TypeAssert::matchesTypeStructure(
-       type_structure(C::class, 'TVec'),
-       null,
-    );
+
+    $ts = type_structure(C::class, 'TStringArray');
+    $ts['kind'] = 20; // TypeStructureKind::OF_VEC in >= 3.17
+    /* HH_IGNORE_ERROR[4110] invalid argument: modified $ts by hand */
+    TypeAssert::matchesTypeStructure($ts, null);
   }
 }

tests/fixtures/TypeConstants.php

@@ -37,8 +37,4 @@ class TypeConstants {
   );
 
   const type TEnum = ExampleEnum;
-
-  /* HH_IGNORE_ERROR[2049] Unbound name unless enable_experimental_tc_features
-   * is on */
-  const type TVec = vec<string>;
 }