#3380: [Patch] Support implicit concatenation in list comprehensions
------------------------------+---------------------------------------------
Reporter: batterseapower | Owner:
Type: feature request | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.4
Severity: normal | Resolution:
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
------------------------------+---------------------------------------------
Comment (by batterseapower):
Yes, though the code generated by this patch may be /slightly/ better than
for your version if you have RULES or foldr/buildable list literals turned
off. The "killer app" that made me implement this was to support the
following idiom:
{{{
system "foo" $
["foo" | fooing_enabled] ++
["bar" | baring_enabled]
}}}
If you want to turn on two options when baring_enabled is on then you can
now write:
{{{
system "foo" $
["foo" | fooing_enabled] ++
["bar1", "bar2" | baring_enabled]
}}}
Which seems quite slick. It's a rather nice interpretation of some
otherwise unused syntax IMHO.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3380#comment:4>
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