### 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.
case GDScriptParser::Node::ARRAY:
		case GDScriptParser::Node::ASSIGNMENT:
		case GDScriptParser::Node::AWAIT:
		case GDScriptParser::Node::BINARY_OPERATOR:
		case GDScriptParser::Node::CALL:
		case GDScriptParser::Node::CAST:
		case GDScriptParser::Node::DICTIONARY:
		case GDScriptParser::Node::GET_NODE:
		case GDScriptParser::Node::IDENTIFIER:
		case GDScriptParser::Node::LAMBDA:
		case GDScriptParser::Node::LITERAL:
		case GDScriptParser::Node::PRELOAD:
		case GDScriptParser::Node::SELF:
		case GDScriptParser::Node::SUBSCRIPT:
		case GDScriptParser::Node::TERNARY_OPERATOR:
		case GDScriptParser::Node::UNARY_OPERATOR:
			reduce_expression(static_cast<GDScriptParser::ExpressionNode *>(p_node), p_is_root);
			break;
		case GDScriptParser::Node::BREAK:
		case GDScriptParser::Node::BREAKPOINT:
		case GDScriptParser::Node::CONTINUE:
		case GDScriptParser::Node::ENUM:
		case GDScriptParser::Node::FUNCTION:
		case GDScriptParser::Node::PASS:
		case GDScriptParser::Node::SIGNAL:
			
			break;
	}
}
void GDScriptAnalyzer::resolve_annotation(GDScriptParser::AnnotationNode *p_annotation) {