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authorSpencer Janssen <sjanssen@cse.unl.edu>2007-07-24 16:59:27 +0200
committerSpencer Janssen <sjanssen@cse.unl.edu>2007-07-24 16:59:27 +0200
commit53b55cb7b1f9836daa5ab4c7e31fa784fdfa4c4b (patch)
treed3207d8135ac1eb15ad2a9ca609929590d38fe51
parent3db17331b1d1308f8d9ceb336d1bfef7a91fadc5 (diff)
downloadmetatile-53b55cb7b1f9836daa5ab4c7e31fa784fdfa4c4b.tar
metatile-53b55cb7b1f9836daa5ab4c7e31fa784fdfa4c4b.zip
Remove redundant 'n >= 0' check from shift. (from David Roundy's 'simplify shift, removing unneeded check.' patch)
darcs-hash:20070724145927-a5988-2e681f183964587aedd9d0b1e0ab33f7e25779ba
-rw-r--r--StackSet.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/StackSet.hs b/StackSet.hs
index 265359c..29b2a48 100644
--- a/StackSet.hs
+++ b/StackSet.hs
@@ -487,7 +487,7 @@ swapMaster = modify' $ \c -> case c of
-- element on the current stack, the original stackSet is returned.
--
shift :: (Ord a, Eq s, Integral i) => i -> StackSet i a s sd -> StackSet i a s sd
-shift n s = if n >= 0 && n `tagMember` s && n /= curtag
+shift n s = if n `tagMember` s && n /= curtag
then maybe s go (peek s) else s
where go w = view curtag . insertUp w . view n . delete w $ s
curtag = tag (workspace (current s))