Do not resolve a late-static-bound get_parent_class() argument inside a trait

The in-trait guard already bails out for $this. Apply it to static::class as well, so
a trait does not resolve a late-static-bound argument against one particular using
class. Outside a trait static::class keeps the narrowed type.

Author: zonuexe

src/Type/Php/GetParentClassDynamicFunctionReturnTypeExtension.php

@@ -76,6 +76,12 @@ public function getTypeFromFunctionCall(
 			}
 		}
 
+		// Inside a trait a late-static-bound value cannot be resolved to a concrete parent,
+		// same as `$this` above.
+		if ($scope->isInTrait() && $valueType instanceof StaticType) {
+			return null;
+		}
+
 		$classNames = $valueType->getObjectClassNames();
 		if (count($classNames) > 0) {
 			// A `$this`/`static` value can be an instance of a subclass through late static

tests/PHPStan/Analyser/nsrt/get-parent-class.php

@@ -45,12 +45,10 @@ trait FooTrait
 
 	public function doBaz()
 	{
-		// Inside a trait the using class is unknown, so $this defers to the general type.
+		// Inside a trait a late-static-bound argument is not resolved to a concrete parent.
 		assertType('class-string|false', get_parent_class());
 		assertType('class-string|false', get_parent_class($this));
-		// self::class / static::class resolve against the using class (Bar).
-		assertType('\'ParentClass\\\\Foo\'', get_parent_class(self::class));
-		assertType('\'ParentClass\\\\Foo\'|class-string<ParentClass\Bar>', get_parent_class(static::class));
+		assertType('class-string|false', get_parent_class(static::class));
 	}
 
 }