#5550: GHC infinite loop when compiling vector
---------------------------------+------------------------------------------
Reporter: simonpj | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.2.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by simonpj):
Actually now I look at it, the `loop` example says
{{{
{-# ANN type SPEC ForceSpecConstr #-}
}}}
ie it applies to SPEC, not to lists. So maybe this condition:
{{{
* Specialise even for arguments that are not scrutinised in the loop
(see argToPat; Trac #4448)
}}}
suould apply '''only for arguments of types that are specified as
`ForceSpecConstr`'''. In `loop`, we force on SPEC but not on lists! (You
implemented this, and I never looked at it in detail.)
That would cure this example. I am not sure whether it'd still make #4448
work, because there is no example code there.
Would that do the job? If so woudl you care to edit `SpecConstr`?
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5550#comment:9>
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