Accessing a member variable before declaring a variable that would overshadow returns null

[DND-dou]

Godot version

4.0-dev.20211108

System information

Ubuntu20.04,headless,HD Graphics 530

Issue description

I'm using Callable in Godot4.The following code works well:

func test():
	print("in test")

func _ready():
	print("_ready:")

	print(test)
	test.call()

output:

_ready:
Node(Node2D.gd)::test
in test

But when I write this:

func test():
	print("in test")

func _ready():
	print("_ready:")

	print(test)
	print(typeof(test))

	var test=12

Output:

_ready:
null
0

Similarly, when I get a function with the same name before a variable declaration, I get null

Is it working properly?

If my grammar is OK,Why do I get null instead of Callable?
Is my grammar wrong? Godot4 doesn't have any reminders!

Steps to reproduce

run this in 4.0.dev

func test():
	print("in test")

func _ready():
	print("_ready:")

	print(test)
	print(typeof(test))

	var test=12

Minimal reproduction project

No response

Production team edit: added highlighting

[dalexeev]

Similarly, when I get a function with the same name before a variable declaration, I get null

It looks like local variable declarations affect the whole function/block. That is, your code is actually:

func test():
    print("in test")

func _ready():
    var test # (It happens implicitly.)

    print("_ready:")

    print(test)
    print(typeof(test))

    test = 12

Probably, the compiler should print an error/warning "Using a local variable before its declaration".

Use self.<name> to access the class members if the function has a local variable with the same name.

[KoBeWi]

There is already a warning about shadowing method/variable names (the example code here shows one too), so the solution is to not use conflicting names,

[DND-dou]

Similarly, when I get a function with the same name before a variable declaration, I get null

It looks like local variable declarations affect the whole function/block. That is, your code is actually:

func test():
    print("in test")

func _ready():
    var test # (It happens implicitly.)

    print("_ready:")

    print(test)
    print(typeof(test))

    test = 12

Probably, the compiler should print an error/warning "Using a local variable before its declaration".

Use self.<name> to access the class members if the function has a local variable with the same name.

@dalexeev
yes,I see.But that's strange!
When I use such code:

func _ready():
	print("_ready:")
	
	print(val)
	var val=12

Output:

ERROR: Parse Error: Identifier "val" not declared in the current scope.
   at: GDScript::reload (res://Node2D.gd:10)
ERROR: Method/function failed. Returning: ERR_PARSE_ERROR
   at: reload (modules/gdscript/gdscript.cpp:855)

it's ERROR!!!
So I can't use a variable before declaring it!!!
Godot does not move variable declarations to the front!
So if this is true, when will Godot move the variable declaration to the front?

[dalexeev]

With #79880 this will work as expected, but will generate warnings.

func test():
    pass

func _ready():
    print(test) # Node(node.gd)::test
    print(typeof(test)) # 25

    var test = 12

    print(test) # 12
    print(typeof(test)) # 2