#4380: Use throwIO instead of throw in an IO context
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Reporter: basvandijk | Owner:
Type: bug | Status: new
Priority: normal | Component: libraries/base
Version: 6.12.3 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Some functions in base use `throw` where the type of the expression is
`IO`. I think they should be using `throwIO` since it guarantees ordering
with respect to other IO actions.
See the [http://thread.gmane.org/gmane.comp.lang.haskell.libraries/13851
thread] on the libraries list.
Some simple benchmarks in the thread also showed that `throwIO` is faster
than `throw`.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4380>
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