[no subject]

[GLS at MIT-MC (Guy L. Steele, Jr.)]

    Date: 30 SEP 1978 0209-EDT
    From: KMP at MIT-MC (Kent M. Pitman)

    I thought we agreed that "," would not generate an error outside of 
    backquote! At the very worst it should be an ordinary character
    when not in backquote. After all, "@" doesn't get similarly wedged.
    We are losing characters fast and sacrificing them for a new feature is
    one thing but making them altogether illegal in certain contexts is
    very restricting I think.

If you allow "," to mean anything useful outside of a back-quoted
expression, then you cannot use it to mean that useful thing
within a back-quoted expression.  Ergo it is a loss so to use it.
QED