error_php_lambdas (#39)

Author: lexidor

.hhconfig

@@ -7,3 +7,4 @@ disallow_destruct = true
 disallow_invalid_arraykey = true
 disallow_stringish_magic = true
 user_attributes=
+error_php_lambdas = true

src/TypeSpec/__Private/VecLikeArraySpec.hack

@@ -40,7 +40,7 @@ final class VecLikeArraySpec<T> extends TypeSpec<array<T>> {
     }
 
     $counter = (
-      function(): \Generator<int, int, void> {
+      (): \Generator<int, int, void> ==> {
         for ($i = 0; true; $i++) {
           yield $i;
         }

tests/TypeStructureTest.hack

@@ -626,7 +626,7 @@ final class TypeStructureTest extends \Facebook\HackTest\HackTest {
   public function testThrowsUnsupportedTypeForGenerators(): void {
     $ts = type_structure(TypeConstants::class, 'TIntTraversable');
     $generator = (
-      function() {
+      (): \Generator<int, int, void> ==> {
         yield 123;
       }
     )();
@@ -637,7 +637,7 @@ final class TypeStructureTest extends \Facebook\HackTest\HackTest {
 
     $ts = type_structure(TypeConstants::class, 'TStringIntKeyedTraversable');
     $generator = (
-      function() {
+      (): \Generator<string, int, void> ==> {
         yield 'foo' => 123;
       }
     )();