dotnet/roslyn

Confusing error message when the target member cannot be located for an explicit interface implementation

Open

#38,467 建立於 2019年9月3日

在 GitHub 查看
 (1 留言) (0 反應) (0 負責人)C# (20,414 star) (4,257 fork)batch import
Area-CompilersBugConcept-Diagnostic ClarityLanguage-C#help wanted

描述

interface I100 { }

class C100 : I100
{
    object I100.M4() => null;
}

Observed:

 error CS0539: 'C100.M4()' in explicit interface declaration is not found among members of the interface that can be implemented

But C100 doesn't have member named M4.

貢獻者指南

技術棧
csharp
領域
developer experiencetooling
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
2
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 hours
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
C# explicit interface implementationRoslyn error reporting
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
50
研究方向
Examine the definitions of error CS0539 in Roslyn source, likely in src/Compilers/CSharp/Portable/Errors/ErrorCode.cs and related message strings. Identify where the condition for this error is emitted (possibly in Binder or OverloadResolution). The fix may involve adding a new error code or modifying the message to clarify that the method is not found in the class.