[Haskell-cafe] error on "--++ bla bla bla"

[Alexander Dunlap]

Comments are started with "--" followed by a character that is not a
symbol character. If it is followed by a symbol character (e.g. "*")
then the "--" plus the symbol (e.g. "--*") parses as an operator
rather than a comment. "p" is not a symbol, so the "--" starts a
comment.

For a precise description of Haskell syntax, see the Haskell98
Report[1]. It's quite readable, at least in comparison to other
"precise" documents I've attempted to read.

Hope that helps.

Alex

On Wed, Sep 30, 2009 at 7:48 PM, Hong Yang <hyangfji at gmail.com> wrote:
> Nowhere any Haskell book mentioned "line comments start with "-- ", not just
> "--"." It is just people usually put "-- " ahead of comments.
>
> I can successfully compile "--print bla bla bla."
> On Wed, Sep 30, 2009 at 7:36 PM, Sebastian Sylvan
> <sebastian.sylvan at gmail.com> wrote:
>>
>>
>> On Thu, Oct 1, 2009 at 12:52 AM, Hong Yang <hyangfji at gmail.com> wrote:
>>>
>>> Hi,
>>>
>>> I got an error if one of lines reads "--++ bla bla bla" where I tried to
>>> comment, but "-- ++ bla bla bla" (notice the space after "--") is OK.
>>>
>>> Do you think this revealed a tiny bug in the GHC compiler (I am using
>>> Windows Haskell Platform 2009.2.0.2)?
>>
>> Line comments start with "-- ", not just "--".
>> --
>> Sebastian Sylvan
>
>
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