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InvalidCastExceptions on generic types from different ALCs can be unhelpful. #80526

@teo-tsirpanis

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@teo-tsirpanis

I got this error in my build:

System.InvalidCastException:

[A]System.Runtime.CompilerServices.StrongBox`1[Microsoft.Build.Tasks.Git.GitRepository] cannot be cast to [B]System.Runtime.CompilerServices.StrongBox`1[Microsoft.Build.Tasks.Git.GitRepository].

Type A originates from 'System.Private.CoreLib, Version=7.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' in the context 'Default' at location 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.2\System.Private.CoreLib.dll'.
Type B originates from 'System.Private.CoreLib, Version=7.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' in the context 'Default' at location 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.2\System.Private.CoreLib.dll'.

Types A and B are the same (and cannot be different since only one SPC can be loaded), which means by process of elimination that the GitRepositoryies in the generic parameters are from different ALCs. But the error message does not indicate that. It can be improved by more deeply analyzing the types to see what doesn't fit.

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    area-AssemblyLoader-coreclrin-prThere is an active PR which will close this issue when it is merged

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