bug#61281: “`(a \, b)” equals to “`(a . , b)”

[Andreas Schwab]

In clisp, backquote is implemented via system::backquote,
system::unquote and system::splice.  Thus the symbol |,| has no special
meaning.

$ clisp -q -x $'(car \'`,X)'
SYSTEM::BACKQUOTE
$ clisp -q -x $'(cadr \'`,X)'
(SYSTEM::UNQUOTE X)
$ clisp -q -x $'(cadr \'`(,@X))'
((SYSTEM::SPLICE X))
$ clisp -q -x "'(system::backquote (system::unquote x))"
`,X
$ clisp -q -x "'(system::backquote (system::splice x))"
`,@X
$ clisp -q -x '`,@x'
*** - READ: the syntax `,@form is invalid

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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