Remove dead isCallable() guard for closure/arrow function callback types

Scope::getType() on a Closure or ArrowFunction AST node always returns a
ClosureType, which is always callable. The isCallable()->yes() check was
therefore always true, making the else branch (FuncCall fallback) dead code
for these node types. This also eliminates an unkillable mutation testing
mutant (yes() vs !no()).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

src/Type/Php/ArrayMapFunctionReturnTypeExtension.php

@@ -175,10 +175,7 @@ private static function resolveCallbackReturnType(Scope $scope, Node\Expr $callb
 			$clone->setAttribute(ArrayMapArgVisitor::ATTRIBUTE_NAME, [new Node\Arg(new TypeExpr($wrappedType))]);
 			$clone->setAttribute('phpstanCachedTypes', []);
 
-			$closureType = $scope->getType($clone);
-			if ($closureType->isCallable()->yes()) {
-				return $closureType->getCallableParametersAcceptors($scope)[0]->getReturnType();
-			}
+			return $scope->getType($clone)->getCallableParametersAcceptors($scope)[0]->getReturnType();
 		}
 
 		return $scope->getType(new FuncCall($callback, [