[GHC] #602: Warning Suppression

[GHC]

#602: Warning Suppression
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        Reporter:  simonmar          |                Owner:
            Type:  task              |               Status:  new
        Priority:  lowest            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  None
      Resolution:  None              |             Keywords:  warnings
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:  N/A
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 And Rust's support reminds me very much of
 [http://help.eclipse.org/mars/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Ftasks
 %2Ftask-suppress_warnings.htm Java's].

 Both Rust and Java support warning suppression (or, for Rust, generation)
 based on scopes. Is that reasonable for Haskell? Maybe. We would continue
 to allow `OPTIONS` to specify flags for the whole file, but we could then
 also support local flags for definitions (or parts of definitions). The
 one thing this design wouldn't allow is setting warning suppression for a
 whole bunch of definitions (but not all). That may be an acceptable
 tradeoff.

 While we're thinking about this, it might be reasonable to consider adding
 arbitrary option-changes locally. (For example, I'd love to be able to
 turn on `LANGUAGE` pragmas only for part of a file.)

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/602#comment:26>
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