Re: How to use `trace` while debuging GHC

On Mon, Nov 12, 2012 at 5:15 AM, Richard Eisenberg wrote:

I've recently used the conveniently-typed (pprTrace :: String -> SDoc ->

a -> a) for this purpose. You have to compile with -DDEBUG, but it works great.

Richard

To use pprTrace you don't actually need to compile with -DDEBUG, it only checks if -dno-debug-output has been specified on the command line: http://www.haskell.org/ghc/docs/latest/html/libraries/ghc/src/Outputable.htm... http://www.haskell.org/ghc/docs/latest/html/libraries/ghc/src/StaticFlags.ht... Cheers, Michal