Interpolated Strings: Compiler error when an interpolated string is too long

[lta14]

Console.WriteLine($"This should work but the compiler explodes if the string is too long!");

This leads to an IndexOutOfRangeException.

[DavidKarlas]

Interpolated Strings is C#6 feature.
NRefactory doesn't support C# 6. You should probably consider switching to Roslyn.