dotnet/roslyn
Internal error in the C# compiler when using "is" operator in VS 2019 watch window
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#50 867 ouverte le 28 janv. 2021
Area-InteractiveBugInteractive-Debugginghelp wanted
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Description
Version Used: .net 5.0 , VS 16.8.4
Steps to Reproduce:
object ob = "Baseball"; var istype = ob is int dc ? "game" : "nothing";
- Hit the breakpoint at var istype
- Add "ob is int dc" to watch widow. It throws the following exception: ob is int dc | error CS0136: A local or parameter named 'dc' cannot be declared in this scope because that name is used in an enclosing local scope to define a local or parameter | (I don't know why)
- In the same watch window, replace dc with any other token, say, marvel (ob is int marvel). This shows "Internal error in c# compiler" (you might have to hit enter twice)
Expected Behavior: show false. Actual Behavior: Shows above to errors.