zaxis wrote:
> oh! thanks!  But why ?

The gory details can be found in the Haskell 98 Report:

  syntax of  do expressions
    http://www.haskell.org/onlinereport/exps.html#do-expressions

  syntax of  decls
    http://www.haskell.org/onlinereport/decls.html

  Details for the layout rule
    http://www.haskell.org/onlinereport/lexemes.html#sect2.7


Regards,
apfelmus

--
http://apfelmus.nfshost.com

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