A @dfn{primitive function} is a function callable from Lisp but
written in the C programming language. Primitive functions are also
called @dfn{subrs} or @dfn{built-in functions}. (The word ``subr'' is
A @dfn{primitive function} is a function callable from Lisp but
written in the C programming language. Primitive functions are also
called @dfn{subrs} or @dfn{built-in functions}. (The word ``subr'' is