Comments¶

Part 21 uses C-style block comments /* ... */. Unlike the EXPRESS embedded remark they do not nest — the lexer reads until the first */.

block comments

/* a single-line comment */
#1= A(1);

/* a comment
   spanning several lines */
#2= B(2);

non-nesting comment

/* outer /* not nested */ #1= A(1);

Here the comment closes at the first */ (the one after not nested), so the rest of the line — #1= A(1); — is live exchange content, not comment.

The /* and */ are recognised only where a token separator may appear, so a comment can sit between two instances:

comment as a token separator

#1= A(1) /* comment */ #2= B(2);