[GHC] #8022: Outdated documentation for the -fwarn-lazy-unlifted-bindings warning

[GHC]

#8022: Outdated documentation for the -fwarn-lazy-unlifted-bindings warning
-------------------------------------+------------------------------------
        Reporter:  asr               |            Owner:  thoughtpolice
            Type:  bug               |           Status:  new
        Priority:  highest           |        Milestone:  7.8.1
       Component:  Documentation     |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
-------------------------------------+------------------------------------

Comment (by simonmar):

 What I'm remembering is this:

 commit 67157c5c25c8044b54419470b5e8cc677be060c3
 {{{
 Author: simonpj at microsoft.com <unknown>
 Date:   Tue Nov 16 17:18:43 2010 +0000

     Warn a bit less often about unlifted bindings.

     Warn when
        (a) a pattern bindings binds unlifted values
        (b) it has no top-level bang
        (c) the RHS has a *lifted* type

     Clause (c) is new, argued for by Simon M

     Eg     x# = 4# + 4#      -- No warning
            (# a,b #) = blah  -- No warning
            I# x = blah       -- Warning
 }}}

 Which should mean that the bindings that Happy uses (where bindings of
 type `Int#`) do not generate warnings.  So is there a bug in the warning?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8022#comment:10>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler