#4148: improve new recursive do syntax
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Reporter: guest | Owner:
Type: feature request | Status: patch
Priority: low | Milestone: 7.6.1
Component: Compiler | Version: 6.12.3
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: None/Unknown
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by simonpj@…):
commit 4f8e86b44ecc31056d0bd7af325b9bb239ddf7a0
{{{
Author: Simon Peyton Jones <[email protected]>
Date: Tue Jun 12 08:42:36 2012 +0100
Revive 'mdo' expressions, per discussion in Trac #4148
Summary:
- mdo expressions are enabled by RecursiveDo pragma
- mdo expressions perform full segmentation
- 'rec' groups inside 'do' are changed so they do *not*
perform any segmentation.
- Both 'mdo' and 'rec' are enabled by 'RecursiveDo'
'DoRec' is deprecated in favour of 'RecursiveDo'
(The 'rec' keyword is also enabled by 'Arrows', as now.)
Thanks to Levent for doing all the work
compiler/main/DynFlags.hs | 9 +-
compiler/parser/Lexer.x | 7 +-
compiler/rename/RnExpr.lhs | 25 +++--
docs/comm/genesis/modules.html | 2 +-
docs/users_guide/flags.xml | 8 +-
docs/users_guide/glasgow_exts.xml | 264
+++++++++++++++++++++---------------
6 files changed, 178 insertions(+), 137 deletions(-)
}}}
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4148#comment:33>
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