-----------------------------------------------------------------------------
module Debug.Trace (
- -- * Tracing
- putTraceMsg, -- :: String -> IO ()
- trace -- :: String -> a -> a
+ -- * Tracing
+ putTraceMsg, -- :: String -> IO ()
+ trace, -- :: String -> a -> a
+ traceShow
) where
import Prelude
withCString msg $ \cmsg ->
debugBelch cfmt cmsg
-foreign import ccall unsafe debugBelch :: CString -> CString -> IO ()
+-- don't use debugBelch() directly, because we cannot call varargs functions
+-- using the FFI.
+foreign import ccall unsafe "HsBase.h debugBelch2"
+ debugBelch :: CString -> CString -> IO ()
#endif
{-# NOINLINE trace #-}