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Only initialise readline if we are connected to a terminal
[ghc-hetmet.git]
/
compiler
/
typecheck
/
TcTyClsDecls.lhs
diff --git
a/compiler/typecheck/TcTyClsDecls.lhs
b/compiler/typecheck/TcTyClsDecls.lhs
index
83b2114
..
89afedf
100644
(file)
--- a/
compiler/typecheck/TcTyClsDecls.lhs
+++ b/
compiler/typecheck/TcTyClsDecls.lhs
@@
-1054,6
+1054,9
@@
checkValidDataCon tc con
addErrCtxt (dataConCtxt con) $
do { checkTc (dataConTyCon con == tc) (badDataConTyCon con)
; checkValidType ctxt (dataConUserType con)
addErrCtxt (dataConCtxt con) $
do { checkTc (dataConTyCon con == tc) (badDataConTyCon con)
; checkValidType ctxt (dataConUserType con)
+ ; checkValidMonoType (dataConOrigResTy con)
+ -- Disallow MkT :: T (forall a. a->a)
+ -- Reason: it's really the argument of an equality constraint
; ifM (isNewTyCon tc) (checkNewDataCon con)
}
where
; ifM (isNewTyCon tc) (checkNewDataCon con)
}
where