"Internal error in the C# compiler" when try to evaluate statement in Watch\Immediate window #18273
Comments
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FYI, I've also hit a similar issue but a different call stack when debugging a .NET Core app with embedded PDBs: Exception: Stack trace: |
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Same here debugging WinForms project Windows 10 v1703 |
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@brettfo That seems unrelated. Could you please file a separate bug? |
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It seems my error stemmed from the fact I was debugging a project on Mac under Parallels desktop and the project wasn't located on the windows' C:\ drive. Still the error could be much clearer. |
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@brettfo Do you have a repro or a crash dump? |
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Repro unit test: [Fact, WorkItem(18273, "https://github.com/dotnet/roslyn/issues/18273")]
public void CapturedLocalInNestedLambda()
{
var source = @"
using System;
class C
{
void M() { }
}";
var compilation0 = CreateStandardCompilation(source, options: TestOptions.DebugDll);
WithRuntimeInstance(compilation0, runtime =>
{
var context = CreateMethodContext(runtime, "C.M");
var testData = new CompilationTestData();
context.CompileExpression("new Action(() => { int x; new Func<int>(() => x).Invoke(); }).Invoke()", out var error, testData);
Assert.Null(error);
testData.GetMethodData("<>x.<>m0").VerifyIL("");
});
} |
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@cston Could you take a look? The variable |
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This looks a lot like a Watson we are tracking https://devdiv.visualstudio.com/DefaultCollection/DevDiv/_workitems?id=403646&_a=edit&triage=true |
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@jaredpar I don't have access to your link :( I am consistently having the problem debugging https://github.com/gitextensions/gitextensions project - both on my Windows PC and running under Parallels on Mac. Both VS2015 and VS2017. Is there a way to find more information on what fails/why the error occurs? |
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Unfortunately that link can't be accessed except by MSFT employees. It represents a Watson crash of the bug. I added it here so we can track both issues together. Don't have more details yet as we are still digging into this. |
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@RussKie This error occurs when the expression being evaluated contains nested lambdas where the inner lambda closes over a local declared in the outer lambda. |
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Unfortunately the issue still wasn't fixed in VS 2022 |
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Possibly related to #19257 |
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@tudor-turcu, thanks for reporting an additional failure. The original bug should be fixed, so you may be hitting a distinct issue. Please consider opening a new issue with a simple example that hits the error. Thanks. |
Version Used:
Microsoft Visual Studio Enterprise 2017
Version 15.0.26228.9 D15RTWSVC
Microsoft .NET Framework
Version 4.6.01586
Project target framework:
.NETCoreApp 1.1
.NET Framework 4.5.2
Steps to Reproduce:
Run the program and put a break point in the start of method "Main"
When break point hit, paste the following statement in Watch window or in the Immediate window:
Expected Behavior:
"1" will printed
Actual Behavior:
"Internal error in the C# compiler" printed
StackTrace:
"The given key was not present in the dictionary."
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