Syntax errors fail silently in headless mode

[radlotus]

Godot version

4.0 - 4.1.rc3

Issue description

syntax errors fail silently in headless mode.

extends MainLoop

const foo

func _initialize():
    print(foo)

extends MainLoop

xfunc _initialize():
    print(100)

extends MainLoop

func _initialize():
    const arr = [1,2,3,4
    print(arr)

[dalexeev]

• Probably related: No runtime errors when running a script with a syntax error (Unexpected "identifier" in class body) #75545.

[dalexeev]

• Duplicate of No runtime errors when running a script with a syntax error (Unexpected "identifier" in class body) #75545.