Fix interface accepting a Closure

Author: ondrejmirtes

src/Type/ObjectType.php

@@ -325,6 +325,10 @@ public function isSuperTypeOf(Type $type): TrinaryLogic
 			return self::$superTypes[$thisDescription][$description] = $type->isSubTypeOf($this);
 		}
 
+		if ($type instanceof ClosureType) {
+			return self::$superTypes[$thisDescription][$description] = $this->isInstanceOf(Closure::class);
+		}
+
 		if ($type instanceof ObjectWithoutClassType) {
 			if ($type->getSubtractedType() !== null) {
 				$isSuperType = $type->getSubtractedType()->isSuperTypeOf($this);
@@ -1289,6 +1293,14 @@ public function isInstanceOf(string $className): TrinaryLogic
 			return TrinaryLogic::createYes();
 		}
 
+		$reflectionProvider = ReflectionProviderStaticAccessor::getInstance();
+		if ($reflectionProvider->hasClass($className)) {
+			$thatClassReflection = $reflectionProvider->getClass($className);
+			if ($thatClassReflection->isFinal()) {
+				return TrinaryLogic::createNo();
+			}
+		}
+
 		if ($classReflection->isInterface()) {
 			return TrinaryLogic::createMaybe();
 		}

tests/PHPStan/Type/ObjectTypeTest.php

@@ -5,6 +5,7 @@
 use ArrayAccess;
 use ArrayObject;
 use Bug8850\UserInSessionInRoleEndpointExtension;
+use Bug9006\TestInterface;
 use Closure;
 use Countable;
 use DateInterval;
@@ -438,6 +439,16 @@ public function dataIsSuperTypeOf(): array
 				new ThisType($reflectionProvider->getClass(UserInSessionInRoleEndpointExtension::class)),
 				TrinaryLogic::createYes(),
 			],
+			62 => [
+				new ObjectType(TestInterface::class),
+				new ClosureType([], new MixedType(), false),
+				TrinaryLogic::createNo(),
+			],
+			63 => [
+				new ObjectType(TestInterface::class),
+				new ObjectType(Closure::class),
+				TrinaryLogic::createNo(),
+			],
 		];
 	}
 
@@ -492,6 +503,16 @@ public function dataAccepts(): array
 				),
 				TrinaryLogic::createNo(),
 			],
+			[
+				new ObjectType(TestInterface::class),
+				new ClosureType([], new MixedType(), false),
+				TrinaryLogic::createNo(),
+			],
+			63 => [
+				new ObjectType(TestInterface::class),
+				new ObjectType(Closure::class),
+				TrinaryLogic::createNo(),
+			],
 		];
 	}
 

tests/PHPStan/Type/TypeCombinatorTest.php

@@ -2,6 +2,7 @@
 
 namespace PHPStan\Type;
 
+use Bug9006\TestInterface;
 use CheckTypeFunctionCall\FinalClassWithMethodExists;
 use CheckTypeFunctionCall\FinalClassWithPropertyExists;
 use Closure;
@@ -2331,6 +2332,22 @@ public function dataUnion(): iterable
 			IntersectionType::class,
 			'array<int, string>&oversized-array',
 		];
+		yield [
+			[
+				new ObjectType(TestInterface::class),
+				new ClosureType([], new MixedType(), false),
+			],
+			UnionType::class,
+			'Bug9006\TestInterface|(Closure(): mixed)',
+		];
+		yield [
+			[
+				new ObjectType(TestInterface::class),
+				new ObjectType(Closure::class),
+			],
+			UnionType::class,
+			'Bug9006\TestInterface|Closure',
+		];
 	}
 
 	/**
@@ -3783,6 +3800,22 @@ public function dataIntersect(): iterable
 			IntersectionType::class,
 			'array<int, string>&oversized-array',
 		];
+		yield [
+			[
+				new ObjectType(TestInterface::class),
+				new ClosureType([], new MixedType(), false),
+			],
+			NeverType::class,
+			'*NEVER*=implicit',
+		];
+		yield [
+			[
+				new ObjectType(TestInterface::class),
+				new ObjectType(Closure::class),
+			],
+			NeverType::class,
+			'*NEVER*=implicit',
+		];
 	}
 
 	/**

tests/PHPStan/Type/data/bug-9006.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Bug9006;
+
+interface TestInterface
+{
+
+}