#4865: Deprecate and remove Prelude.catch and System.IO.Error.{catch,try}
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Reporter: igloo | Owner:
Type: proposal | Status: new
Priority: normal | Milestone: Not GHC
Component: libraries/base | Version: 7.0.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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`Prelude` and `System.IO.Error` both export an old version of `catch`,
which only catches `IOError`s, and `System.IO.Error` additionally exports
`try` with the same problem.
These exports are annoying for people who want to use the modern exception
handling functions in `Control.Exception`, as you need to explicitly
either import the `Prelude` with `catch` hidden, or give the module of the
function you want to use.
They may also be confusing for beginners, who may not expect to have to
use anything other than the `catch` function in the default scope to catch
all exceptions.
I believe these functions are only there for historical reasons, and are
old cruft that we should tidy up, so I propose that in the `base` package
that comes with GHC 7.2 we deprecate these old functions, and in 7.4 we
remove them.
Suggested deadline: 24 Jan 2011.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4865>
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