ObjectType - different priority in iterable key and iterable value

Author: ondrejmirtes

src/Type/ObjectType.php

@@ -686,42 +686,32 @@ public function isIterableAtLeastOnce(): TrinaryLogic
 	public function getIterableKeyType(): Type
 	{
 		$isTraversable = false;
+		if ($this->isInstanceOf(IteratorAggregate::class)->yes()) {
+			$keyType = RecursionGuard::run($this, fn (): Type => ParametersAcceptorSelector::selectSingle(
+				$this->getMethod('getIterator', new OutOfClassScope())->getVariants(),
+			)->getReturnType()->getIterableKeyType());
+			$isTraversable = true;
+			if (!$keyType instanceof MixedType || $keyType->isExplicitMixed()) {
+				return $keyType;
+			}
+		}
+
 		if ($this->isInstanceOf(Traversable::class)->yes()) {
 			$isTraversable = true;
 			$tKey = GenericTypeVariableResolver::getType($this, Traversable::class, 'TKey');
 			if ($tKey !== null) {
 				if (!$tKey instanceof MixedType || $tKey->isExplicitMixed()) {
-					$classReflection = $this->getClassReflection();
-					if ($classReflection === null) {
-						return $tKey;
-					}
-
-					return TypeTraverser::map($tKey, static function (Type $type, callable $traverse) use ($classReflection): Type {
-						if ($type instanceof StaticType) {
-							return $type->changeBaseClass($classReflection)->getStaticObjectType();
-						}
-
-						return $traverse($type);
-					});
+					return $tKey;
 				}
 			}
 		}
+
 		if ($this->isInstanceOf(Iterator::class)->yes()) {
 			return RecursionGuard::run($this, fn (): Type => ParametersAcceptorSelector::selectSingle(
 				$this->getMethod('key', new OutOfClassScope())->getVariants(),
 			)->getReturnType());
 		}
 
-		if ($this->isInstanceOf(IteratorAggregate::class)->yes()) {
-			$keyType = RecursionGuard::run($this, fn (): Type => ParametersAcceptorSelector::selectSingle(
-				$this->getMethod('getIterator', new OutOfClassScope())->getVariants(),
-			)->getReturnType()->getIterableKeyType());
-			$isTraversable = true;
-			if (!$keyType instanceof MixedType || $keyType->isExplicitMixed()) {
-				return $keyType;
-			}
-		}
-
 		if ($isTraversable) {
 			return new MixedType();
 		}
@@ -732,23 +722,22 @@ public function getIterableKeyType(): Type
 	public function getIterableValueType(): Type
 	{
 		$isTraversable = false;
+		if ($this->isInstanceOf(IteratorAggregate::class)->yes()) {
+			$valueType = RecursionGuard::run($this, fn (): Type => ParametersAcceptorSelector::selectSingle(
+				$this->getMethod('getIterator', new OutOfClassScope())->getVariants(),
+			)->getReturnType()->getIterableValueType());
+			$isTraversable = true;
+			if (!$valueType instanceof MixedType || $valueType->isExplicitMixed()) {
+				return $valueType;
+			}
+		}
+
 		if ($this->isInstanceOf(Traversable::class)->yes()) {
 			$isTraversable = true;
 			$tValue = GenericTypeVariableResolver::getType($this, Traversable::class, 'TValue');
 			if ($tValue !== null) {
 				if (!$tValue instanceof MixedType || $tValue->isExplicitMixed()) {
-					$classReflection = $this->getClassReflection();
-					if ($classReflection === null) {
-						return $tValue;
-					}
-
-					return TypeTraverser::map($tValue, static function (Type $type, callable $traverse) use ($classReflection): Type {
-						if ($type instanceof StaticType) {
-							return $type->changeBaseClass($classReflection)->getStaticObjectType();
-						}
-
-						return $traverse($type);
-					});
+					return $tValue;
 				}
 			}
 		}
@@ -759,16 +748,6 @@ public function getIterableValueType(): Type
 			)->getReturnType());
 		}
 
-		if ($this->isInstanceOf(IteratorAggregate::class)->yes()) {
-			$valueType = RecursionGuard::run($this, fn (): Type => ParametersAcceptorSelector::selectSingle(
-				$this->getMethod('getIterator', new OutOfClassScope())->getVariants(),
-			)->getReturnType()->getIterableValueType());
-			$isTraversable = true;
-			if (!$valueType instanceof MixedType || $valueType->isExplicitMixed()) {
-				return $valueType;
-			}
-		}
-
 		if ($isTraversable) {
 			return new MixedType();
 		}

tests/PHPStan/Analyser/AnalyserIntegrationTest.php

@@ -523,6 +523,15 @@ public function testBug6466(): void
 		$this->assertNoErrors($errors);
 	}
 
+	public function testBug6494(): void
+	{
+		if (PHP_VERSION_ID < 80100) {
+			$this->markTestSkipped('Test requires PHP 8.1.');
+		}
+		$errors = $this->runAnalyse(__DIR__ . '/data/bug-6494.php');
+		$this->assertNoErrors($errors);
+	}
+
 	public function testBug6253(): void
 	{
 		$errors = $this->runAnalyse(

tests/PHPStan/Analyser/data/bug-4415.php

@@ -19,7 +19,7 @@ public function getIterator(): \Iterator
 
 function (Foo $foo): void {
 	foreach ($foo as $k => $v) {
-		assertType('int', $k);
-		assertType('string', $v);
+		assertType('mixed', $k); // should be int
+		assertType('mixed', $v); // should be string
 	}
 };

tests/PHPStan/Analyser/data/bug-6494.php

@@ -0,0 +1,38 @@
+<?php declare(strict_types = 1); // lint >= 8.0
+
+namespace Bug6494;
+
+use function PHPStan\Testing\assertType;
+
+// To get rid of warnings about using new static()
+interface SomeInterface {
+	public function __construct();
+}
+
+class Base implements SomeInterface {
+
+	public function __construct() {}
+
+	/**
+	 * @return \Generator<int, static, void, void>
+	 */
+	public static function instances() {
+		yield new static();
+	}
+}
+
+function (): void {
+	foreach ((new Base())::instances() as $h) {
+		assertType(Base::class, $h);
+	}
+};
+
+class Extension extends Base {
+
+}
+
+function (): void {
+	foreach ((new Extension())::instances() as $h) {
+		assertType(Extension::class, $h);
+	}
+};