[Bug] Class method 'self' looses special self scope with added type annotation

Got send here from 'vscode-python' https://github.com/microsoft/vscode-python/issues/11593

• Editor name and version: VS Code version: 1.44.2
• Platform: Windows_NT x64 10.0.17134
• Color scheme: Custom (close to Monokai)
• MagicPython version: Dunno which vscode uses

Without type annotation everything is just fine.

When a type annotation is added to the self parameter the special scope for self is missing.

Steps to reproduce:

Paste the following code into a *.py file and inspect the self parameter with the developer token inspect tool. Like in the screenshots above.
The self parameter of the bad_func should show the actual scopes and the self parameter of the good_func should show the expected scopes.

class Test:
    def bad_func(self: Test):
        pass
    
    def good_func(self):
        pass

从复现的 Python 代码片段开始，使用开发者 token 检查工具检查带注解和不带注解的 self 参数的 token 作用域。跟踪处理类方法参数的语法高亮路径；当 self: Test 保留与未注解的 self 相同的特殊 self 作用域时，即表示完成。