Haskell 2010 draft report

Ian Lynagh igloo at earth.li
Sat May 1 08:18:50 EDT 2010

On Fri, Apr 30, 2010 at 05:05:17PM +0100, Simon Marlow wrote:
> I've completed most of the edits to the Haskell 98 report for Haskell  
> 2010, modulo the changes to the libraries that we still have to resolve.
> I cleaned up various other things I discovered along the way, and tidied  
> up the typesetting.  I've also made a much nicer HTML rendering of the  
> report using TeX4ht, which means we can ditch the old 1500 lines of  
> hacked up Haskell code which used to do the HTML conversion before.
> You can see the draft report here, in PDF and online HTML respectively:
> http://www.haskell.org/~simonmar/haskell-2010-draft-report.pdf
> http://www.haskell.org/~simonmar/haskell-2010-draft-report/haskell.html
> In the PDF you'll notice that the bits that changed in Haskell 2010  
> relative to Haskell 98 are purple (except for the FFI chapter).  
> Unfortunately I haven't yet managed to make this work in the HTML  
> version, but it ought to be possible.
> I'd appreciate a few more eyes over this, in particular look out for  
> messed up typesetting as there could still be a few bugs lurking.

In the PDF:

p37: "guard  -->  pat <- infixexp"
     Is that really meant to be infixexp, not exp? GHC accepts:
          | True <- True :: Bool
              = 'a'

p37: Hmm, likewise "guard  -->  infixexp". GHC accepts
          | True :: Bool
              = 'a'
     but hugs doesn't (unexpected `::'). So I guess these are both
     just GHC bugs, although I wonder why the report isn't more liberal.

p42: The negative literal alternative in pat is redundant

p47: I'm not sure I see the reason for this change. It seems to just
     make it more complicated. If the change is made, should say y is a
     new variable.
     I don't know if the colouring is important, but there's a black "y"
     that should be purple, and two purple "_ ->" that should be black,

p47: Case (h) is alone in ending in a full stop

p48: Case s, again I don't see the point of the y binding


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