### Godot version

4.0 Beta 11 to 13

### System information

Windows 10

### Issue description

When trying to upgrade from Beta 10 one of my projects would immediately crash when opening the editor, with no error in the console which also crashed. I managed to isolate it to this enum:

```
enum { # Directions, clockwise, powers of 100, each direction gets 2 digits, allowing 100 terrains
	CENTER = 01,
	NORTH = 0100, # -Z
	NORTH_EAST = 010000,
	EAST = 01000000, # +X
	SOUTH_EAST = 0100000000,
	SOUTH = 010000000000, # +Z
	SOUTH_WEST = 01000000000000,
	WEST = 0100000000000000, # -X
	NORTH_WEST = 010000000000000000,
	ALL = 010101010101010101,
	ALL_CORNERS = NORTH_EAST + SOUTH_EAST + SOUTH_WEST + NORTH_WEST,
}
```

With this last line causing the crash:
`ALL_CORNERS = NORTH_EAST + SOUTH_EAST + SOUTH_WEST + NORTH_WEST,`

This worked in all the betas I've used up to and including Beta 10


### Steps to reproduce

Copy and paste that enum into a script, and save. Simply having a script with this enum will cause the editor to crash, the script doesn't need to be used anywhere.

### Minimal reproduction project

N/A
p_function->set_datatype(resolving_datatype);
#ifdef TOOLS_ENABLED
	int default_value_count = 0;
#endif 
	for (int i = 0; i < p_function->parameters.size(); i++) {
		resolve_parameter(p_function->parameters[i]);
#ifdef DEBUG_ENABLED
		if (p_function->parameters[i]->usages == 0 && !String(p_function->parameters[i]->identifier->name).begins_with("_")) {
			parser->push_warning(p_function->parameters[i]->identifier, GDScriptWarning::UNUSED_PARAMETER, function_name, p_function->parameters[i]->identifier->name);
		}
		is_shadowing(p_function->parameters[i]->identifier, "function parameter");
#endif 
#ifdef TOOLS_ENABLED
		if (p_function->parameters[i]->initializer) {
			default_value_count++;
			if (p_function->parameters[i]->initializer->is_constant) {
				p_function->default_arg_values.push_back(p_function->parameters[i]->initializer->reduced_value);
			} else {
				p_function->default_arg_values.push_back(Variant()); 
			}
		}
#endif 
	}
	if (!p_is_lambda && function_name == GDScriptLanguage::get_singleton()->strings._init) {
		
		GDScriptParser::DataType return_type = parser->current_class->get_datatype();
		return_type.is_meta_type = false;
		p_function->set_datatype(return_type);
		if (p_function->return_type) {
			GDScriptParser::DataType declared_return = resolve_datatype(p_function->return_type);