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Improve error message when importing data constructors (ticket #4058).
[ghc-hetmet.git]
/
compiler
/
typecheck
/
TcEnv.lhs
diff --git
a/compiler/typecheck/TcEnv.lhs
b/compiler/typecheck/TcEnv.lhs
index
4b5730b
..
c51f786
100644
(file)
--- a/
compiler/typecheck/TcEnv.lhs
+++ b/
compiler/typecheck/TcEnv.lhs
@@
-637,7
+637,13
@@
data InstBindings a
-- in TcDeriv
pprInstInfo :: InstInfo a -> SDoc
-- in TcDeriv
pprInstInfo :: InstInfo a -> SDoc
-pprInstInfo info = vcat [ptext (sLit "InstInfo:") <+> ppr (idType (iDFunId info))]
+pprInstInfo info = hang (ptext (sLit "instance"))
+ 2 (sep [ ifPprDebug (pprForAll tvs)
+ , pprThetaArrow theta, ppr tau
+ , ptext (sLit "where")])
+ where
+ (tvs, theta, tau) = tcSplitSigmaTy (idType (iDFunId info))
+
pprInstInfoDetails :: OutputableBndr a => InstInfo a -> SDoc
pprInstInfoDetails info = pprInstInfo info $$ nest 2 (details (iBinds info))
pprInstInfoDetails :: OutputableBndr a => InstInfo a -> SDoc
pprInstInfoDetails info = pprInstInfo info $$ nest 2 (details (iBinds info))