Opening Swensen.Unquote should not shadow FSharp.Core.Operators.raise with internal raise implementation

[GoogleCodeExporter]

Unquote uses a custom inline implementation raise to achieve clean stack traces 
which undesirably shadows the Microsoft implementation of raise when the 
Swensen.Unquote namespace is opened.

Original issue reported on code.google.com by stephen....@gmail.com on 16 Mar 2015 at 1:53