11 lines
155 B
Racket
11 lines
155 B
Racket
#lang racket
|
|
|
|
(provide/contract
|
|
;; like the unix debugging facility
|
|
[tee (-> symbol? any/c any)]
|
|
)
|
|
|
|
|
|
(define (tee tag x)
|
|
(printf "~a ~s\n" tag x)
|
|
x) |