#lang racket

(provide (all-defined-out))

(define-syntax (nil stx)
  (if (identifier? stx)
    (syntax/loc stx (quote ()))
    (raise-syntax-error #f "cannot be used as a function" stx)))

(define-syntax (t stx)
  (if (identifier? stx)
    (syntax/loc stx (quote t))
    (raise-syntax-error #f "cannot be used as a function" stx)))