[GHC] #15601: Unexpected compile error on type level lists with a single element

GHC ghc-devs at haskell.org
Tue Sep 4 00:42:10 UTC 2018


#15601: Unexpected compile error on type level lists with a single element
-------------------------------------+-------------------------------------
        Reporter:  erikd             |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:  invalid           |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by erikd):

 Ok, thanks.

 The solution for single element lists is to use:
 {{{
 type TypeList5 = TypeList2 :++ '[ 'F]
 }}}
 where bot the list and the constructor are ticked *and* there is a space
 between the open square bracket and the first ticked constructor.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15601#comment:2>
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