Re: Block comments ala Ray

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

On Sun, Feb 14, 2021 at 4:36 PM Vincent Lefevre <vincent@xxxxxxxxxx> wrote:
>
> How about the "'' " prefix (two single quotes followed by a space)

Not very visually distinctive, especially for two single quotes then
space then newline.

Also as I mentioned, it's significantly more work if the introducer is
more than two characters, because of the need to back up and re-lex if
it turns out not to be a comment.  It's easy to peek one character
ahead of "!" and unget the peek if it isn't "#".  To use more than two
characters means turning the whole thing into a real lexical token
rather than just something thrown away during lexing (as happens with
comments at present).

Hm, what about paren then ampersand?  Doesn't conflict with ksh
pattern-list syntax, is currently a syntax error, etc.  The problem
being that the reverse (ampersand paren) could appear in valid code,
so the end marker would have to be asymmetric to remove that
objection.