fsharp/FSharp.Compiler.Service — pull request #117 by rojepp (2014-04-08 21:57:11+00:00)
Title: Improvement to Tooltip description API

This PR fixes #114 and implements the API changes I suggested there.

That is, the `Declaration.DescriptionText` property changes type from ToolTipText to `Async>` where the second choice is an error message.
This leaves client apps with a choice of how to handle errors and how long to wait for a response.