#5813: Offer a compiler warning for failable pattern matches
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Reporter: snoyberg | Owner:
Type: feature request | Status: new
Priority: normal | Milestone: 7.6.1
Component: Compiler | Version: 7.2.2
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: None/Unknown
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by simonmar):
For things like this we usually add a warning flag, but do ''not'' include
it in `-Wall`. We have a bunch of flags in this category already
(cut/pasted from the docs):
{{{
<option>-fwarn-tabs</option>,
<option>-fwarn-incomplete-uni-patterns</option>,
<option>-fwarn-incomplete-record-updates</option>,
<option>-fwarn-monomorphism-restriction</option>,
<option>-fwarn-unrecognised-pragmas</option>,
<option>-fwarn-auto-orphans</option>,
<option>-fwarn-implicit-prelude</option>.</para>
}}}
In reply to maeder: the manual desugaring you describe is not semantics-
preserving, so it's not surprising that you suddently get a new warning.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5813#comment:5>
GHC <http://www.haskell.org/ghc/>
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