fix: functions returning closures, arrow functions or anonymous classes containing yield expressions falsely detected as generators

Author: Sebastian Kehr

src/Reflection/ReflectionFunctionAbstract.php

@@ -8,6 +8,8 @@
 use PhpParser\Node\Expr\Throw_ as NodeThrow;
 use PhpParser\Node\Expr\Yield_ as YieldNode;
 use PhpParser\Node\Expr\YieldFrom as YieldFromNode;
+use PhpParser\Node\FunctionLike as FunctionLikeNode;
+use PhpParser\Node\Stmt\Class_ as ClassNode;
 use PhpParser\Node\Stmt\ClassMethod as MethodNode;
 use PhpParser\NodeTraverser;
 use PhpParser\NodeVisitor\FindingVisitor;
@@ -360,7 +362,12 @@ private function nodeIsOrContainsYield(Node $node): bool
         foreach ($node->getSubNodeNames() as $nodeName) {
             $nodeProperty = $node->$nodeName;
 
-            if ($nodeProperty instanceof Node && $this->nodeIsOrContainsYield($nodeProperty)) {
+            if (
+                $nodeProperty instanceof Node &&
+                ! ($nodeProperty instanceof ClassNode) &&
+                ! ($nodeProperty instanceof FunctionLikeNode) &&
+                $this->nodeIsOrContainsYield($nodeProperty)
+            ) {
                 return true;
             }
 

test/unit/Reflection/ReflectionFunctionAbstractTest.php

@@ -236,6 +236,9 @@ public static function generatorProvider(): array
             ['<?php function foo() { $foo->func(yield $foo); }', true],
             ['<?php function foo() { new Foo(yield $foo); }', true],
             ['<?php function foo() { yield from []; }', true],
+            ['<?php function foo() { return fn () => yield $foo; }', false],
+            ['<?php function foo() { return function () { yield $foo; }; }', false],
+            ['<?php function foo() { return new class () { function bar() { yield $foo; } }; }', false],
         ];
     }