projects
/
ghc-hetmet.git
/ blobdiff
commit
grep
author
committer
pickaxe
?
search:
re
summary
|
shortlog
|
log
|
commit
|
commitdiff
|
tree
raw
|
inline
| side by side
Always ppr case alts on separate lines
[ghc-hetmet.git]
/
compiler
/
typecheck
/
TcDeriv.lhs
diff --git
a/compiler/typecheck/TcDeriv.lhs
b/compiler/typecheck/TcDeriv.lhs
index
0254155
..
30e57ff
100644
(file)
--- a/
compiler/typecheck/TcDeriv.lhs
+++ b/
compiler/typecheck/TcDeriv.lhs
@@
-936,10
+936,7
@@
cond_functorOK :: Bool -> Condition
-- (c) don't use argument in the wrong place, e.g. data T a = T (X a a)
-- (d) optionally: don't use function types
-- (e) no "stupid context" on data type
-- (c) don't use argument in the wrong place, e.g. data T a = T (X a a)
-- (d) optionally: don't use function types
-- (e) no "stupid context" on data type
-cond_functorOK allowFunctions (dflags, rep_tc)
- | not (xopt Opt_DeriveFunctor dflags)
- = Just (ptext (sLit "You need -XDeriveFunctor to derive an instance for this class"))
-
+cond_functorOK allowFunctions (_, rep_tc)
| null tc_tvs
= Just (ptext (sLit "Data type") <+> quotes (ppr rep_tc)
<+> ptext (sLit "has no parameters"))
| null tc_tvs
= Just (ptext (sLit "Data type") <+> quotes (ppr rep_tc)
<+> ptext (sLit "has no parameters"))