#1338: base package breakup
---------------------------------+------------------------------------------
Reporter: simonmar | Owner:
Type: task | Status: new
Priority: normal | Milestone: 6.12 branch
Component: libraries/base | Version: 6.6.1
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Comment (by igloo):
Although it looks, from the source, like the IO part of `Data.Typeable`
should be able to be split off from the `Typeable` classes etc, this is
sadly not the case.
Right down at the bottom of the module hierarchy we have
{{{
error s = throw (ErrorCall s)
}}}
which needs `ErrorCall` to have a `Typeable` instance. Although in the
source this is just `deriving Typeable`, the generated code calls
`mkTyCon`, which calls `mkTyConKey`, which does IO (hidden by
`unsafePerformIO`).
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1338#comment:28>
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