diff options
Diffstat (limited to 'compiler/typecheck/TcCanonical.lhs')
| -rw-r--r-- | compiler/typecheck/TcCanonical.lhs | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/compiler/typecheck/TcCanonical.lhs b/compiler/typecheck/TcCanonical.lhs index 3dd88446e1..a7533ed8b8 100644 --- a/compiler/typecheck/TcCanonical.lhs +++ b/compiler/typecheck/TcCanonical.lhs @@ -199,10 +199,10 @@ canEvNC :: CtLoc -> CtEvidence -> TcS StopOrContinue -- Called only for non-canonical EvVars canEvNC d ev = case classifyPredType (ctEvPred ev) of - ClassPred cls tys -> canClassNC d ev cls tys - EqPred ty1 ty2 -> canEqNC d ev ty1 ty2 - TuplePred tys -> canTuple d ev tys - IrredPred {} -> canIrred d ev + ClassPred cls tys -> traceTcS "canEvNC:cls" (ppr cls <+> ppr tys) >> canClassNC d ev cls tys + EqPred ty1 ty2 -> traceTcS "canEvNC:eq" (ppr ty1 $$ ppr ty2) >> canEqNC d ev ty1 ty2 + TuplePred tys -> traceTcS "canEvNC:tup" (ppr tys) >> canTuple d ev tys + IrredPred {} -> traceTcS "canEvNC:irred" (ppr (ctEvPred ev)) >> canIrred d ev \end{code} @@ -249,6 +249,8 @@ canClass d ev cls tys ; let co = mkTcTyConAppCo (classTyCon cls) cos xi = mkClassPred cls xis ; mb <- rewriteCtFlavor ev xi co + ; traceTcS "canClass" (vcat [ ppr ev <+> ppr cls <+> ppr tys + , ppr xi, ppr mb ]) ; case mb of Nothing -> return Stop Just new_ev -> continueWith $ |