Improve error messages slightly

diff --git a/compiler/typecheck/TcPat.lhs b/compiler/typecheck/TcPat.lhs
index b8bbed7..c6caa54 100644 (file)
--- a/compiler/typecheck/TcPat.lhs
+++ b/compiler/typecheck/TcPat.lhs
@@ -978,7 +978,7 @@ patCtxt pat             = Just (hang (ptext (sLit "In the pattern:"))
 existentialExplode :: LPat Name -> SDoc
 existentialExplode pat
   = hang (vcat [text "My brain just exploded.",
-               text "I can't handle pattern bindings for existentially-quantified constructors.",
+               text "I can't handle pattern bindings for existential or GADT data constructors.",
                text "Instead, use a case-expression, or do-notation, to unpack the constructor.",
                text "In the binding group for"])
        4 (ppr pat)
@@ -1030,7 +1030,7 @@ existentialProcPat con
 lazyPatErr :: Pat name -> [TcTyVar] -> TcM ()
 lazyPatErr _ tvs
   = failWithTc $
-    hang (ptext (sLit "A lazy (~) pattern cannot bind existential type variables"))
+    hang (ptext (sLit "A lazy (~) pattern cannot match existential or GADT data constructors"))
        2 (vcat (map pprSkolTvBinding tvs))
 
 nonRigidMatch :: PatCtxt -> DataCon -> SDoc