Godot shows an error in console if you're using C# 10 feature "File-Scoped namespaces" (ERROR: Failed to determine namespace and class for script)

[valkyrienyanko]

Godot version

3.4.4.stable.mono

System information

Windows 10 64-bit

Issue description

C# 10.0 added a new feature "File scoped namespaces"

If you try to use this feature you will get a error that will flash before your eyes just before the game is done building but you can see the error clearly in VSCode console. (I opened Godot through VSCode)

ERROR: Failed to determine namespace and class for script: res://Scripts/UI/Inventory/ControlInventory.cs. 
Parse error: Unexpected token: Symbol

The game seems to run fine. The error is the only annoying thing to see everything the game is started.

Having file-scoped namespaces would make scripts alot easier to read.

Steps to reproduce

Convert any namespace in any script to a file-scoped namespace. Notice the error in the console just before game start.

With file-scoped namespace

Without file-scoped namespace

Minimal reproduction project

No response

[raulsntos]

Fixed by #56427