Hong Yang hyang...@gmail.com writes:
But in my program, I did not define --++.
And that's what the error tells you, no?
Defining operators (or not) doesn't change the syntax. Since the lexeme
--++ is syntactially a valid operator, it will be parsed as such,
regardless of whether it is defined
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)?
Thanks,
Hong
I don't think it's a bug. --++ is a valid operator, whereas --
introduces a comment.
In GHCI:
Prelude let (--++) = (+) in 5 --++ 6
11
Hope this helps,
Dan
On Wed, Sep 30, 2009 at 7:52 PM, Hong Yang hyang...@gmail.com wrote:
Hi,
I got an error if one of lines reads --++ bla bla bla where I
On Thu, Oct 1, 2009 at 12:52 AM, Hong Yang hyang...@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
But in my program, I did not define --++.
Also in GHCI,
Prelude :t (--++)
No in scope: '--++'
Prelude :t (+)
(+) :: (Num a) = a - a - a
Thanks,
Hong
On Wed, Sep 30, 2009 at 7:05 PM, Daniel Peebles pumpkin...@gmail.comwrote:
I don't think it's a bug. --++ is a valid operator, whereas --
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.syl...@gmail.com wrote:
On Thu, Oct 1, 2009 at
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
Oops...forgot the footnote. The lexical syntax part of the report is
at http://haskell.org/onlinereport/lexemes.html.
Alex
On Wed, Sep 30, 2009 at 7:56 PM, Alexander Dunlap
alexander.dun...@gmail.com wrote:
Comments are started with -- followed by a character that is not a
symbol character. If
