Don't suggest adding an alias to an extern alias that is not a valid identitifer

描述

贡献者指南

技术栈

csharp

领域

developer experiencebackend

议题类型

bug

难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。

3

预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。

1-3 hours

活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。

stale

清晰度议题是否清楚说明期望改动、验收标准和下一步。

clear

前置要求

C# knowledgeRoslyn compiler basicsUnderstanding of identifier validation

新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。

60

研究方向

The issue is about preventing the suggestion of an alias that is not a valid identifier. Look at the completion provider in Roslyn that handles extern alias suggestions. Specifically, examine the class `ExternAliasCompletionProvider` or similar. The fix involves adding a check that the alias string is a valid C# identifier before suggesting it. Review existing tests for alias completion to understand the expected behavior. The change should be small and localized to the suggestion logic.