#3380: [Patch] Support implicit concatenation in list comprehensions
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Reporter: batterseapower | Owner:
Type: feature request | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.4
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Comment (by igloo):
I have no net opinion either way. On the one hand, it would be nice to be
able to do it, but on the flipside, I can imagine people getting confused
if they don't notice that there isn't an extra pair of square brackets.
A quick grep finds some cases where this could be used in the GHC sources:
{{{
./main/DriverPipeline.hs: let pkg_framework_opts = concat [
["-framework", fw] | fw <- pkg_frameworks ]
./main/DriverPipeline.hs: framework_opts = concat [ ["-framework",
fw] | fw <- reverse frameworks ]
./main/GHC.hs: concat [ [(m,True), (m,False)] | m <- ms_home_srcimps s
]
./rename/RnNames.lhs: ; addUsedRdrNames (concat [ [mkRdrQual mod
occ, mkRdrUnqual occ]
}}}
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3380#comment:6>
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