Consider a ClosureType() as maybe impure by default when no impurePoints array provided

Author: jf-m

src/PhpDoc/TypeNodeResolver.php

@@ -360,7 +360,7 @@ private function resolveIdentifierTypeNode(IdentifierTypeNode $typeNode, NameSco
 				return new CallableType(null, null, true, null, null, [], TrinaryLogic::createYes());
 
 			case 'pure-closure':
-				return new ClosureType();
+				return ClosureType::createPure();
 
 			case 'resource':
 				$type = $this->tryResolvePseudoTypeClassType($typeNode, $nameScope);

src/Type/ClosureType.php

@@ -75,12 +75,15 @@ class ClosureType implements TypeWithClassName, CallableParametersAcceptor
 
 	private TemplateTypeVarianceMap $callSiteVarianceMap;
 
+	/** @var SimpleImpurePoint[] */
+	private array $impurePoints;
+
 	/**
 	 * @api
 	 * @param array<int, ParameterReflection>|null $parameters
 	 * @param array<non-empty-string, TemplateTag> $templateTags
 	 * @param SimpleThrowPoint[] $throwPoints
-	 * @param SimpleImpurePoint[] $impurePoints
+	 * @param ?SimpleImpurePoint[] $impurePoints
 	 * @param InvalidateExprNode[] $invalidateExpressions
 	 * @param string[] $usedVariables
 	 */
@@ -93,7 +96,7 @@ public function __construct(
 		?TemplateTypeVarianceMap $callSiteVarianceMap = null,
 		private array $templateTags = [],
 		private array $throwPoints = [],
-		private array $impurePoints = [],
+		?array $impurePoints = null,
 		private array $invalidateExpressions = [],
 		private array $usedVariables = [],
 	)
@@ -105,6 +108,7 @@ public function __construct(
 		$this->templateTypeMap = $templateTypeMap ?? TemplateTypeMap::createEmpty();
 		$this->resolvedTemplateTypeMap = $resolvedTemplateTypeMap ?? TemplateTypeMap::createEmpty();
 		$this->callSiteVarianceMap = $callSiteVarianceMap ?? TemplateTypeVarianceMap::createEmpty();
+		$this->impurePoints = $impurePoints ?? [new SimpleImpurePoint('functionCall', 'call to an unknown Closure', false)];
 	}
 
 	/**
@@ -115,6 +119,11 @@ public function getTemplateTags(): array
 		return $this->templateTags;
 	}
 
+	public static function createPure(): self
+	{
+		return new self(null, null, true, null, null, null, [], [], []);
+	}
+
 	public function isPure(): TrinaryLogic
 	{
 		$impurePoints = $this->getImpurePoints();

tests/PHPStan/Type/ClosureTypeTest.php

@@ -23,6 +23,11 @@ public function dataIsSuperTypeOf(): array
 				new ClosureType([], new MixedType(), false),
 				TrinaryLogic::createYes(),
 			],
+			[
+				new ClosureType([], new MixedType(), false, null, null, null, [], [], []),
+				new ClosureType([], new MixedType(), false),
+				TrinaryLogic::createMaybe(),
+			],
 			[
 				new ClosureType([], new UnionType([new IntegerType(), new StringType()]), false),
 				new ClosureType([], new IntegerType(), false),

tests/PHPStan/Type/TypeCombinatorTest.php

@@ -2535,7 +2535,7 @@ public function dataUnion(): iterable
 		yield [
 			[
 				new CallableType(null, null, true, null, null, [], TrinaryLogic::createYes()),
-				new ClosureType(),
+				ClosureType::createPure(),
 			],
 			CallableType::class,
 			'pure-callable(): mixed',
@@ -2553,7 +2553,7 @@ public function dataUnion(): iterable
 				new ClosureType([], new MixedType(), true, null, null, null, [], [], [
 					new SimpleImpurePoint('functionCall', 'foo', true),
 				]),
-				new ClosureType(),
+				ClosureType::createPure(),
 			],
 			UnionType::class,
 			'(Closure(): mixed)|(pure-Closure)',
@@ -2563,7 +2563,7 @@ public function dataUnion(): iterable
 				new ClosureType([], new MixedType(), true, null, null, null, [], [], [
 					new SimpleImpurePoint('functionCall', 'foo', false),
 				]),
-				new ClosureType(),
+				ClosureType::createPure(),
 			],
 			ClosureType::class,
 			'Closure(): mixed',
@@ -4219,7 +4219,7 @@ public function dataIntersect(): iterable
 		yield [
 			[
 				new CallableType(null, null, true, null, null, [], TrinaryLogic::createYes()),
-				new ClosureType(),
+				ClosureType::createPure(),
 			],
 			ClosureType::class,
 			'pure-Closure',
@@ -4237,7 +4237,7 @@ public function dataIntersect(): iterable
 				new ClosureType([], new MixedType(), true, null, null, null, [], [], [
 					new SimpleImpurePoint('functionCall', 'foo', true),
 				]),
-				new ClosureType(),
+				ClosureType::createPure(),
 			],
 			NeverType::class,
 			'*NEVER*=implicit',
@@ -4247,7 +4247,7 @@ public function dataIntersect(): iterable
 				new ClosureType([], new MixedType(), true, null, null, null, [], [], [
 					new SimpleImpurePoint('functionCall', 'foo', false),
 				]),
-				new ClosureType(),
+				ClosureType::createPure(),
 			],
 			ClosureType::class,
 			'pure-Closure',