LINE-COMMENT : MEXPR

LINE-COMMENT is a top-level command.
Attach a comment to a given existing line.
The comment will be parsed for gwffs and line numbers
as follows: anything enclosed in # symbols is assumed to
be a gwff, and anything enclosed in $ symbols is assumed
to be the number of an existing line. Line numbers in
comments will be updated as lines are moved around;
gwffs will be printed in the current STYLE.
Examples:
"1st copy of line $5$, instantiated with #COMPOSE#"
"2nd copy of line $5$, instantiated with ITERATE"
"3rd copy of line $5$, instantiated with #a OR b#"
(The first prints the definition of COMPOSE; the
second prints the word "ITERATE", and the third prints
the given gwff. If line 5 is subsequently renumbered,
the line number will change in all these comments.)
The command format for LINE-COMMENT is:

 <n>LINE-COMMENT       LINE  COMMENT 
"EXISTING-LINE" "STRING"


The arguments have the following meaning:
LINE : Line
COMMENT : Comment

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