Re: [GHC] #13584: ghci parse error on operator info

17 Apr 2017


      #13584: ghci parse error on operator info
-------------------------------------+-------------------------------------
        Reporter:  akegalj           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  lowest            |            Milestone:
       Component:  GHCi              |              Version:  8.0.2
      Resolution:                    |             Keywords:  parse, info,
                                     |  operator
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Incorrect result  |  (amd64)
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Description changed by akegalj:

@@ -21,1 +21,1 @@
- use the same parser here and there:ž
+ use the same parser in both places:

New description:

 If requested info about some operator, ie `(+)` `:info (+)` is working as
 expected:
 {{{#!haskell
...
:i (+)
 class Num a where
   (+) :: a -> a -> a
   ...
         -- Defined in ‘GHC.Num’
 infixl 6 +
 }}}
When additional space character is there `:info (+ )` it won't parse:
 {{{#!haskell
...
:i (+ )
<interactive>:1:3: error:
     parse error (possibly incorrect indentation or mismatched brackets)
 }}}

 Note that the same thing is working with `:type` so its strange it doesn't
 use the same parser in both places:
 {{{#!haskell
...
:t (+ )
 (+ ) :: Num a => a -> a -> a
 }}}
--

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13584#comment:1
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler

    