EE: Cannot reference duplicate typename with no alias · dotnet/roslyn#1530

2015-03-24T18:13:22.000Z

Ported from TFS WorkItem: 1144921 --- Repro Steps: a.cs : public class A { } c.cs : extern alias X; class C { static void Main() { var x = new A(); var y = new X.A(); System.Diagnostics.Debugger.Break(); } } 1. Compile: >csc /t:library a.cs /out:a1.dll >csc /t:library a.cs /out:a2.dll >csc /debug /r:a1.dll /r:X=a2.dll c.cs 2. Debug exe 3. Evaluate "new A()": Result: --- Revisions: 1) Created By Chuck Stoner (3/24/2015 10:42:17 AM) --- 2) Edited By Manish Jayaswal (3/24/2015 11:08:07 AM) this is not a regression from Dev12. ---

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描述

Ported from TFS WorkItem: 1144921

Created By Chuck Stoner (3/24/2015 10:42:17 AM)

Edited By Manish Jayaswal (3/24/2015 11:08:07 AM)

this is not a regression from Dev12.

贡献者指南

技术栈: csharp
领域: tooling
议题类型: bug
难度: 5
预计时间: over 1 week
活动状态: stale
清晰度: needs investigation
前置要求: understanding of C# extern aliasbasic knowledge of Roslyn compiler
新手友好度: 15
研究方向: The issue describes a bug where 'EE: Cannot reference duplicate typename with no alias' in the Roslyn compiler. To reproduce, follow the steps: create two identical libraries (a1.dll and a2.dll), compile with extern alias, and debug. The expected behavior is that evaluating 'new A()' works, but it fails. Since the issue is from 2015 and unassigned, first verify if the bug still exists in the current Roslyn version. Look at related code in the EE (Expression Evaluator) module, possibly in files like 'src/ExpressionEvaluator/CSharp/...' or 'src/ExpressionEvaluator/VisualBasic/...'. Check for any linked PRs or comments that might provide clues. If confirmed, the fix likely involves handling duplicate types with aliases in the expression evaluator.