#2798: Enable "rec" keyword when RecursiveDo is enabled?
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Reporter: nominolo | Owner:
Type: task | Status: new
Priority: high | Milestone: 6.12.1
Component: Compiler | Version: 6.11
Severity: minor | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Comment (by simonmar):
We (Simon & Simon) think the ideal state of affairs would be:
* Allow `rec` in `do` (as Ross intended)
* Deprecate `mdo`
as far as flags go, there are two options:
* have the existing `RecursiveDo` flag enable the new `rec` syntax, and
deprecate the use of `mdo`. Eventually `mdo` would be removed as a
keyword.
* Define a new extension, e.g. `DoRec` for the new `rec` keyword, and
deprecate the old `RecursiveDo` extension.
The second approach has the benefit that we can identify obsolete code on
Hackage without trying to compile it, but it means having two similarly-
named extensions which could lead to confusion.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2798#comment:6>
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