#3263: Warnings for monadic values not used
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Reporter: NeilMitchell | Owner: igloo
Type: feature request | Status: closed
Priority: normal | Milestone: 6.12.1
Component: Compiler | Version: 6.10.2
Severity: normal | Resolution: fixed
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Comment (by rwbarton):
Testing this in 6.12.1 RC 1--when I `:load` an offending file in ghci I
get a warning like this:
{{{
Warning: A do-notation statement discarded a result of type IO
Bool.
Suppress this warning by saying "_ <- tick<1>(return
(tick<0>(doesFileExist "foo")))",
or by using the flag -fno-warn-wrong-do-bind
}}}
There's no `tick<n>` stuff when I compile with ghc.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3263#comment:12>
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