### Godot version

Beta 17, master

### System information

Windows 11

### Issue description

Godot gets a hard crash while attempting to code-complete for member `const` of a class.

### Steps to reproduce

```GDScript
enum E { V1 }

const e := E
```

And then type a `.` after the last `E`, which triggers code hints/auto-completion for subscripts based on `E` and causes a hard crash.

Does not happen for `var e := E.V1`.

### Minimal reproduction project

See above.
if (expression_type.is_variant() && !is_enum_cast && !is_type_compatible(p_type, value_type, true, p_expression)) {
		push_error(vformat(R"(Cannot %s a value of type "%s" as "%s".)", p_usage, value_type.to_string(), p_type.to_string()), p_expression);
		return;
	}
#ifdef DEBUG_ENABLED
	if (p_type.kind == GDScriptParser::DataType::ENUM && value_type.builtin_type == Variant::INT && !enum_has_value(p_type, p_expression->reduced_value)) {
		parser->push_warning(p_expression, GDScriptWarning::INT_AS_ENUM_WITHOUT_MATCH, p_usage, p_expression->reduced_value.stringify(), p_type.to_string());
	}
#endif
	if (value_type.builtin_type == p_type.builtin_type) {
		p_expression->set_datatype(p_type);
		return;
	}
	Variant converted_to;
	const Variant *converted_from = &p_expression->reduced_value;
	Callable::CallError call_error;
	Variant::construct(p_type.builtin_type, converted_to, &converted_from, 1, call_error);
	if (call_error.error) {
		push_error(vformat(R"(Failed to convert a value of type "%s" to "%s".)", value_type.to_string(), p_type.to_string()), p_expression);
		return;
	}
#ifdef DEBUG_ENABLED
	if (p_type.builtin_type == Variant::INT && value_type.builtin_type == Variant::FLOAT) {
		parser->push_warning(p_expression, GDScriptWarning::NARROWING_CONVERSION);
	}
#endif
	p_expression->reduced_value = converted_to;
	p_expression->set_datatype(p_type);
}
void GDScriptAnalyzer::update_array_literal_element_type(GDScriptParser::ArrayNode *p_array, const GDScriptParser::DataType &p_element_type) {