[GHC] #10052: Panic (something to do with floatExpr?)

[GHC]

#10052: Panic (something to do with floatExpr?)
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        Reporter:  edsko             |                   Owner:  simonmar
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.10.1
       Component:  Compiler          |                 Version:  7.10.1-rc2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by simonpj):

 So the fixes needed are:

  * Complain in a civilised way if you are using the interpreter with `-O`.
 Add a clear `Note` to explain why, enumerating all the things (that we
 know of) which can go wrong.

  * Add a clear Note in `FloatOut` to explain that the un-handled case
 concerns breakpoints (which isn't at all clear right now), and that
 breakpoints means the interpreter, and the interpreter means no `-O`
 (refer to Note from the first bullet).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10052#comment:8>
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