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

[Simon Peyton Jones]

Peter:

Here's a bad crash, due to you.   (Doing this by email because I'm offline.)
 
The (Tick t e) case of FloatOut.floatExpr is incomplete.  It simply panics in some cases.

Could you fix this please?  Either that case shouldn't happen, in which case Core Lint should check for it, and whoever is generating it should be fixed.  Or it should happen, in which case floatExpr should do the right thing.

Could you leave a Note to explain what is happening in the floatExpr (Tick ...) cases?

Thanks

Simon

| -----Original Message-----
| From: ghc-tickets [mailto:ghc-tickets-bounces at haskell.org] On Behalf Of
| GHC
| Sent: 31 January 2015 17:38
| Cc: ghc-tickets at haskell.org
| Subject: [GHC] #10052: Panic (something to do with floatExpr?)
| 
| #10052: Panic (something to do with floatExpr?)
| -------------------------------------+-----------------------------------
| --
|               Reporter:  edsko       |             Owner:
|                   Type:  bug         |            Status:  new
|               Priority:  normal      |         Milestone:
|              Component:  Compiler    |           Version:  7.10.1-rc2
|               Keywords:              |  Operating System:
| Unknown/Multiple
|           Architecture:              |   Type of failure:  None/Unknown
|   Unknown/Multiple                   |        Blocked By:
|              Test Case:              |   Related Tickets:
|               Blocking:              |
| Differential Revisions:              |
| -------------------------------------+-----------------------------------
| --
|  Loading
| 
|  {{{
|  main = let (x :: String) = "hello" in putStrLn x
|  }}}
| 
|  using a very simple driver for the GHC API (see T145.hs) causes a ghc
|  panic:
| 
|  {{{
|  [1 of 1] Compiling Main             ( T145-input.hs, interpreted )
|  T145: T145: panic! (the 'impossible' happened)
|    (GHC version 7.10.0.20150128 for x86_64-apple-darwin):
|          floatExpr tick
|  <<details unavailable>>
| 
|  Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
|  }}}
| 
|  This panic is arising in our test case for #8333, so it may be related
| to
|  that bug.
| 
| --
| Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10052>
| GHC <http://www.haskell.org/ghc/>
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