[GHC] #11482: Turn -fdefer-typed-holes on by default

[GHC]

#11482: Turn -fdefer-typed-holes on by default
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        Reporter:  thomie            |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9497, #11481     |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Lemming):

 A different approach to the problem would be a TotalHaskell extension.
 The first and simple approach would be to warn about any use of
 `undefined` and `error`,
 and the second much more sophisticated approach would be to warn only
 about bottoms that can be reached plus a termination check.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11482#comment:4>
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