/usr/share/axiom-20170501/src/algebra/NONE.spad is in axiom-source 20170501-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | )abbrev domain NONE None
++ Author: Mark Botch
++ Description:
++ \spadtype{None} implements a type with no objects. It is mainly
++ used in technical situations where such a thing is needed (for example,
++ the interpreter and some of the internal \spadtype{Expression} code).
None() : SIG == CODE where
SIG ==> SetCategory
CODE ==> add
coerce(none:%):OutputForm == "NONE" :: OutputForm
x:% = y:% == EQ(x,y)$Lisp
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