[GHC] #10744: Allow oneShot to work with unboxed types
GHC
ghc-devs at haskell.org
Thu Aug 6 22:08:41 UTC 2015
#10744: Allow oneShot to work with unboxed types
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Reporter: akio | Owner:
Type: feature request | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.10.2
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Revisions:
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Comment (by akio):
Replying to [comment:4 nomeata]:
> Hmm, I am not sure if this is a valid use of `oneShot` if you cannot
guarantee that the Builder will be used only once, as GHC and the runtime
(probably) relies on the annotation to be correct, and you might get
crashes at runtime.
Oh, I didn't know this, thank you for pointing it out. I had hoped that it
worked the same way as the state hack, which does not cause a crash even
if the assumption is violated and the IO action is used multiple times.
If this is not a valid use of `oneShot`, I don't have real uses that
involve unlifted types. I'm happy to close this ticket.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10744#comment:5>
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