[Haskell-cafe] Disable LINE Pragma handling in GHC

Antoine Latter aslatter at gmail.com
Fri Sep 10 08:13:12 EDT 2010

On Fri, Sep 10, 2010 at 1:40 AM, JP Moresmau <jpmoresmau at gmail.com> wrote:
> Hello fellow Haskellers,
> In EclipseFP we use the GHC API for IDE related stuff like syntax
> highlighting and code outlines. However, I ran into something funny
> yesterday: when a source file contains LINE pragmas
> (http://www.haskell.org/ghc/docs/6.12.2/html/users_guide/pragmas.html#line-pragma),
> all the locations for tokens are changed to reflect the pragmas information.
> While this is great in the "normal' GHC usage, this is not so great for us,
> because we're interested in that source code, not in original code. I
> haven't seen any flag to turn that behavior off in the docs, nor in the
> Lexer code, but have I missed something? Can I tell GHC to just ignore these
> pragmas? I suppose even using GHC for building and something else
> (haskell-src-exts?) for code handling would leave us with compilation
> messages at the wrong place.
> Thanks,

Would you turn the behavior back on when editing .hsc files or
something similar?

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