traceRn = traceOptTcRn Opt_D_dump_rn_trace
traceSplice = traceOptTcRn Opt_D_dump_splices
-
traceIf, traceHiDiffs :: SDoc -> TcRnIf m n ()
traceIf = traceOptIf Opt_D_dump_if_trace
traceHiDiffs = traceOptIf Opt_D_dump_hi_diffs
getSrcSpanM = do { env <- getLclEnv; return (tcl_loc env) }
setSrcSpan :: SrcSpan -> TcRn a -> TcRn a
-setSrcSpan loc thing_inside
- | isGoodSrcSpan loc = updLclEnv (\env -> env { tcl_loc = loc }) thing_inside
- | otherwise = thing_inside -- Don't overwrite useful info with useless
+setSrcSpan loc@(RealSrcSpan _) thing_inside
+ = updLclEnv (\env -> env { tcl_loc = loc }) thing_inside
+-- Don't overwrite useful info with useless:
+setSrcSpan (UnhelpfulSpan _) thing_inside = thing_inside
addLocM :: (a -> TcM b) -> Located a -> TcM b
addLocM fn (L loc a) = setSrcSpan loc $ fn a
updCtxt upd = updLclEnv (\ env@(TcLclEnv { tcl_ctxt = ctxt }) ->
env { tcl_ctxt = upd ctxt })
--- Conditionally add an error context
-maybeAddErrCtxt :: Maybe Message -> TcM a -> TcM a
-maybeAddErrCtxt (Just msg) thing_inside = addErrCtxt msg thing_inside
-maybeAddErrCtxt Nothing thing_inside = thing_inside
-
popErrCtxt :: TcM a -> TcM a
popErrCtxt = updCtxt (\ msgs -> case msgs of { [] -> []; (_ : ms) -> ms })
mkErrInfo :: TidyEnv -> [ErrCtxt] -> TcM SDoc
-- Tidy the error info, trimming excessive contexts
mkErrInfo env ctxts
+ | opt_PprStyle_Debug -- In -dppr-debug style the output
+ = return empty -- just becomes too voluminous
+ | otherwise
= go 0 env ctxts
where
go :: Int -> TidyEnv -> [ErrCtxt] -> TcM SDoc
-- (captureConstraints m) runs m, and returns the type constraints it generates
captureConstraints thing_inside
= do { lie_var <- newTcRef emptyWC ;
- res <- updLclEnv (\ env -> env { tcl_lie = lie_var })
- thing_inside ;
- lie <- readTcRef lie_var ;
- return (res, lie) }
+ res <- updLclEnv (\ env -> env { tcl_lie = lie_var })
+ thing_inside ;
+ lie <- readTcRef lie_var ;
+ return (res, lie) }
captureUntouchables :: TcM a -> TcM (a, Untouchables)
captureUntouchables thing_inside
= updLclEnv upd thing_inside
where
upd env = env { tcl_env = tcl_env lcl_env,
- tcl_tyvars = tcl_tyvars lcl_env }
+ tcl_tyvars = tcl_tyvars lcl_env }
+
+traceTcConstraints :: String -> TcM ()
+traceTcConstraints msg
+ = do { lie_var <- getConstraintVar
+ ; lie <- readTcRef lie_var
+ ; traceTc (msg ++ "LIE:") (ppr lie)
+ }
\end{code}
%************************************************************************
-%* *
- Template Haskell context
-%* *
+%* *
+ Template Haskell context
+%* *
%************************************************************************
\begin{code}