Elm has great error messages which do this. F# is also adopting some of that style in F# 4.1: https://blogs.msdn.microsoft.com/dotnet/2016/07/25/a-peek-into-f-

Elm has great error messages which do this. F# is also adopting some of that style in F# 4.1: https://blogs.msdn.microsoft.com/dotnet/2016/07/25/a-peek-into-f-4-1/ https://blogs.msdn.microsoft.com/dotnet/2016/07/25/a-peek-in...