If the type of a variable is a built-in Variant type, then it will
automatically be assigned a default value based on the type. This means
that the explicit initialization may be unnecessary. Thus this commit
removes the warning in such case.
This also changes the meaning of the unassigned warning to happen when
the variable is used before being assigned, not when it has zero
assignments.
Not defaulting to the native type rationale:
Defaulting to the native type is less than useful, as:
* There are very few native types that are extensible and have static methods.
* Defaulting to the native type does not account for a method being script-defined.
While the "real fix" would be to carefully track the source of the method, the get_function_signature method is already complicated enough.
This will at least ensure the resulting code should always be valid.
Not triggering on self-calls rationale:
Found in PR comment https://github.com/godotengine/godot/pull/85918#issuecomment-1935864459
```
static func example():
pass
func example2():
example() # self-call on static function
```
Disabling this warning on self-calls is:
* Consistent with other languages
* Important for anonymous classes (where the output code is unusable)
- Allow identifiers similar to keywords if they are in ASCII range.
- Allow constants to be treated as regular identifiers.
- Allow keywords that can be used as identifiers in expressions.
This is using an adapted version of UAX#31 to not rely on the ICU
database (which isn't available in builds without TextServerAdvanced).
It allows most characters used in diverse scripts but not everything.
changed RETURN_VALUE_DISCARDED GDscript warning text to mention how the return value of a function is discarded; update GDScript parser warning test to include new warning text.
This makes sure that assigning values to enum-typed variables are
consistent. Same enum is always valid, different enum is always
invalid (without casting) and assigning `int` creates a warning
if there is no casting.
There are new test cases to ensure this behavior doesn't break in
the future.
