If you somehow end up with a Singleton.gd that looks like this:
extends Node
class_name Singleton
func foo():
pass
You will get an error when using it in another file:
extends Node2D
func _init():
# Parser Error: Non-static function "foo" can only be called from an instance.
Singleton.foo()
This error is confusing. This patch ensures that an error on the class_name line will be produced:
Parse Error: The class "Singleton" conflicts with the AutoLoad singleton of the same name, and is therefore redundant. Remove the class_name declaration to fix this error.
Fixes#28187.
8f5ffeeacc