special-operator-p symbol → generalized-boolean

symbol — a symbol.

generalized-boolean — a generalized boolean.

Returns true if symbol is a special operator; otherwise, returns false.

(special-operator-p 'if) → true 
(special-operator-p 'car) → false 
(special-operator-p 'one) → false

Should signal type-error if its argument is not a symbol.

Historically, this function was called special-form-p. The name was finally declared a misnomer and changed, since it returned true for special operators, not special forms.