dotnet/roslyn

Improve error message reported when attempting to declare `ref` field in a `ref struct`

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#37,597 创建于 2019年7月30日

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Area-CompilersBugConcept-Diagnostic ClarityLanguage-C#help wanted

描述

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Current error message:

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Seems like the code is parsed as method declaration. It would be better to parse as field declaration and report error on ref keyword.

贡献者指南

技术栈
csharp
领域
backenddeveloper experience
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。
4
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。
half day
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# ref structsRoslyn parser basics
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。
40
研究方向
Investigate the Roslyn parser's handling of field declarations in ref structs. The current code likely parses `ref int x;` as a method declaration. Modify the parser to recognize it as a field declaration and emit an error on the `ref` keyword. Look at files like `Lexer.cs`, `Parser.cs`, or `SyntaxParser.cs` in the CSharp parser directory.
Improve error message reported when attempting to declare `ref` field in a `ref struct` · dotnet/roslyn#37597 | Good First Issue