Given the following Typed Racket program:
#lang typed/racket
(: greater-than-5? (Any -> Boolean))
(define (greater-than-5? x)
(and (integer? x) (> x 5)))
(: equal-to-7? (Any -> Boolean))
(define (equal-to-7? x)
(and (greater-than-5? x) (= x 7)))
I receive the error (highlighting the x in (= x 7)):
Type Checker: Expected Complex, but got Any in: x
Is there a way to tag greater-than-5? to mark that it only returns #t on
integers? Marking its type as (Any -> Boolean : Integer) causes an error:
Type Checker: Expected result with filter ((Integer @ x) | (! Integer @
x)), got filter (((U Float Integer) @ x) | (OrFilter (! Integer @ x) ((U
Float Integer) @ x))) in: (and (integer? x) (> x 5))
-- Jeremiah Willcock
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