kazu-yamamoto/ghc-mod — pull request #42 by eagletmt (2012-02-14 05:57:16+00:00)
Title: Avoiding GHC's panic in ghc-mod type

## On visiting LHsExpr Id
Some elements inside a `LHsExpr Id` are invalid after type-checking.
The ghc-syb-utils package provides nice utilities to avoid such elements.

## On getting SrcSpan
`SrcSpan` is valid only if `isGoodSrcSpan`.