ARTICLE AD BOX
In the .NET Runtime Source Code, on this line, we will see:
public override string Get( string value!! ) { if ( value.Length == 0 ) { return string.Empty; } // ... }The value parameter has two exclamation marks after it.
At first, I thought this may be some C# language feature that I missed related to nullability annotations, until I realized, this is not even valid C# code, and is still compiled in the .NET Runtime.
The !! does not make sense for Visual Studio. I'm using the latest C# language features and does not compile:
It is definitely compiled.
What's going on here? Why is there an invalid line of C# in the official runtime source tree, yet it still compiles there?
