[commit: ghc] wip/nested-cpr: Improve pprIfaceStrictSig (c6e4760)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : wip/nested-cpr
Link       : http://ghc.haskell.org/trac/ghc/changeset/c6e47601667945d51d686718c04e3b8e6cb383e3/ghc

>---------------------------------------------------------------

commit c6e47601667945d51d686718c04e3b8e6cb383e3
Author: Joachim Breitner <mail at joachim-breitner.de>
Date:   Thu Dec 5 11:41:31 2013 +0000

    Improve pprIfaceStrictSig


>---------------------------------------------------------------

c6e47601667945d51d686718c04e3b8e6cb383e3
 compiler/basicTypes/Demand.lhs |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compiler/basicTypes/Demand.lhs b/compiler/basicTypes/Demand.lhs
index b0c7f01..50ca43f 100644
--- a/compiler/basicTypes/Demand.lhs
+++ b/compiler/basicTypes/Demand.lhs
@@ -1507,7 +1507,9 @@ seqStrictSig (StrictSig ty) = seqDmdType ty
 -- Used for printing top-level strictness pragmas in interface files
 pprIfaceStrictSig :: StrictSig -> SDoc
 pprIfaceStrictSig (StrictSig (DmdType _ dmds res))
-  = hcat (map ppr dmds) <> ppr res
+  = hcat (map ppr dmds) <> ppr_res
+  where
+  ppr_res = if isTopRes res then empty else ppr res
 \end{code}
 
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