#3968: DoRec not supported, but RecursiveDo deprecated
------------------------+---------------------------------------------------
Reporter: m4dc4p | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.12.1 | Keywords:
Os: Windows | Testcase:
Architecture: x86 | Failure: GHC rejects valid program
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GHC 6.12.1 reports that the !RecursiveDo pragma has been deprecated in
favor of !DoRec. However, !DoRec has two problems:
* Not supported by GHC
* Not defined in Cabal's Language.Haskell.Extension.Extension data type.
When compiling with -XRecursiveDo, a warning is issued.
When compiling with -XDoRec, the mdo syntax is not recognized. You get
"Not in scope: `mdo'" or "parse error on input `<-'".
It doesn't seem to matter if the commmand line flag or LANGUAGE pragma is
used.
The following shows the results of compiling the attached file with the
two flags:
{{{
>ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.12.1
>ghc -c -fforce-recomp -XRecursiveDo DoRec.hs
on the commandline:
Warning: -XRecursiveDo is deprecated: use -XDoRec or pragma {-#
LANGUAGE DoRec #-} instead
>ghc -c -fforce-recomp -XDoRec DoRec.hs
DoRec.hs:5:8: Not in scope: `mdo'
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3968>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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