Misleading error message when attempting to create an instance of a singleton

[aaronfranke]

Godot version

0511f9d 4.2.dev (current master as of writing)

System information

macOS 13.4.1 (this issue affects all systems)

Issue description

When trying to construct a built-in singleton (ex: DisplayServer.new()), this error message is misleading:

The error message says it's abstract, which seems like it should indicate that you need to use a derived class. However, this is a singleton, and you are meant to use its methods directly. Instead of the current error text, it should say something about how it's a singleton and you should use its methods directly.

Steps to reproduce

Write DisplayServer.new() in the script editor.

Minimal reproduction project

Since it's one line I am not going to bother making a MRP.

[dalexeev]

• Fixed by GDScript: Prevent constructing and inheriting engine singletons #82098.