alternative to loadWithLogge

Judah Jacobson judah.jacobson at
Thu Aug 18 19:21:57 CEST 2011

On Tue, Aug 16, 2011 at 2:25 AM, Kazu Yamamoto <kazu at> wrote:
> Hello,
> ghc-mod, IDE-like back-end for Emacs, uses warning related APIs
> including loadWithLogger and getWarnings in GHC 7.0.3 API. I found
> that they disappeared in GHC 7.2.1 API. What should I use to handle
> warnings in GHC 7.2.1 API?

You can set the log_action field of the session's DynFlags to a custom
handler.  Its value is

type LogAction = Severity -> SrcSpan -> PprStyle -> Message -> IO ()

The Severity parameter will let you tell whether a message is a
warning or an error.


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