Bearing in mind that the characters that have been used to begin
end of line comments include *, /, ;, !, #, %, and $, it's not
clear that there's anything _that_ regrettable about "-- ".
Recall that the problem is not with isolated characters, but whole strings.
"-- a" is a comment, "--a" is a comment, but "---a" is not. That is done
wrong. Either make them all comments, or make them none comments.
"{- a -}" is a comment, "{-a-}" is a comment, "{--a--}" is a comment,
"{---}" is a comment. That is done right. Similarly, in C, "/***/" is a
comment; in C++, "///" is a comment (compare with Haskell's "---"!); in
LaTeX, "%%@#$&^*" is a comment. These are all done right. Consistently.
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