^ and _ symbols are printed with quotes:
(print '(^ _))
=>
(|^| |_|)
Neither of them satisfy the second criterion for potential numbers:
http://www.lispworks.com/reference/HyperSpec/Body/02_caa.htm
"The token contains at least one digit."
'. is read as SI:|.|, while it should signal an error.
#.. errors with "The variable SI:|.| is unbound."
--
With best regards, Stas.
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