Add internal toMutatingScope on Scope interface

Author: ondrejmirtes

src/Analyser/Generator/GeneratorScope.php

@@ -4251,4 +4251,9 @@ public function invokeNodeCallback(Node $node): void
 		Fiber::suspend(new NodeCallbackRequest($node, $this, null));
 	}
 
+	public function toMutatingScope(): self
+	{
+		return $this;
+	}
+
 }

src/Analyser/Scope.php

@@ -150,4 +150,7 @@ public function isInFirstLevelStatement(): bool;
 
 	public function getPhpVersion(): PhpVersions;
 
+	/** @internal */
+	public function toMutatingScope(): self;
+
 }