#7157: 'let' keyword optional in do notation
------------------------------+---------------------------------------------
Reporter: Oblosys | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler
Version: 7.6.1-rc1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Would it be possible to make the 'let' keyword in a do block optional? So
instead of
{{{
do ...
let x = exp1
y = exp2
z <- exp3
...
}}}
you could simply write
{{{
do ...
x = exp1
y = exp2
z <- exp3
...
}}}
Where each sequence of let-less bindings is put in a separate binding
group. I'm no parsing wizard, but I couldn't come up with any situations
in which this would cause ambiguity. To me, the let-less version is easier
on the eyes, more consistent with <- bindings, and also makes it less of a
hassle to move stuff around.
The above probably also holds for list/monad comprehensions, but the
explicit let has never really bothered me there.
I've also posted the idea on Haskell cafe:
[http://www.mail-archive.com/haskell-cafe@haskell.org/msg100541.html]
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7157>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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