File: is_constant.doc

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\DOC is_constant

\TYPE {is_constant : (string -> bool)}

\SYNOPSIS
Determines whether a string is the name of a constant.

\DESCRIBE
This predicate returns {true} if the given string argument is the name
of a constant defined in the current theory or its ancestors:
it returns {false} otherwise.

\EXAMPLE
{
#is_constant `SUC`;;
true : bool

#is_constant `3`;;
true : bool

#is_constant `$!`;;
false : bool

#is_constant `!`;;
true : bool

#is_constant `xx`;;
false : bool
}
\SEEALSO
is_infix, is_binder

\ENDDOC