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

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 wrote:

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 wrote:

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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 wrote:

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On Thu, Oct 1, 2009 at 12:52 AM, Hong Yang wrote:

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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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