fsharp/FSharp.Compiler.Service — pull request #272 by dungpa (2014-11-19 14:36:06+00:00)
Title: Report printf specifiers from Service API

Close #174.

The PR seems to cover most important cases:
- regular vs. verbatim vs. triple-quote strings
- single-line vs multiline strings, built-in printf functions
- printf-like user defined functions

One thing isn't very nice: ASTs don't preserve information whether a string is regular, verbatim or triple-quote. Consequently, we have to lookup the source string to recover that information and create correct offsets for reporting ranges.