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improve the way '() is treated as a constant

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so it fits in with stronger and whatnot and
the other list contracts
This commit is contained in:
Robby Findler 2014-12-13 14:54:31 -06:00
parent 63f7cf1568
commit c3e92093f6
3 changed files with 19 additions and 8 deletions
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2
pkgs/racket-test/tests/racket/contract/stronger.rkt
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@ -150,6 +150,8 @@
(or/c (-> string?) (-> integer? integer?) integer?)
(or/c (-> integer? integer?) integer?))
(ctest #t contract-stronger? (list/c) '())
(ctest #t contract-stronger? (list/c) '())
(ctest #t contract-stronger? (cons/c boolean? integer?) (cons/c boolean? integer?))
(ctest #f contract-stronger? (cons/c boolean? integer?) (cons/c integer? boolean?))
(ctest #t contract-stronger? (cons/c number? (listof number?)) (non-empty-listof number?))

11
racket/collects/racket/contract/private/guts.rkt
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@ -52,7 +52,7 @@
contract-custom-write-property-proc
(rename-out [contract-custom-write-property-proc custom-write-property-proc])
set-listof-any-and-cons/c-anyany!)
set-some-basic-contracts!)
(define (contract-custom-write-property-proc stct port display?)
(write-string "#<" port)
@ -220,9 +220,11 @@
;; bang it in here and use it only after it's been banged in.
(define listof-any #f)
(define consc-anyany #f)
(define (set-listof-any-and-cons/c-anyany! l p)
(define list/c-empty #f)
(define (set-some-basic-contracts! l p mt)
(set! listof-any l)
(set! consc-anyany p))
(set! consc-anyany p)
(set! list/c-empty mt))
(define (coerce-contract/f x [name name-default])
(define (coerce-simple-value x)
@ -239,7 +241,8 @@
x
#f
(memq x the-known-good-contracts))])]
[(or (symbol? x) (boolean? x) (char? x) (null? x) (keyword? x))
[(null? x) list/c-empty]
[(or (symbol? x) (boolean? x) (char? x) (keyword? x))
(make-eq-contract x
(if (name-default? name)
(if (or (null? x)

14
racket/collects/racket/contract/private/misc.rkt
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@ -1135,8 +1135,11 @@
(higher-order-list/c ctc-args)]))
(define (list/c-name-proc c)
(apply build-compound-type-name
'list/c (generic-list/c-args c)))
(define args (generic-list/c-args c))
(cond
[(null? args) ''()]
[else (apply build-compound-type-name 'list/c args)]))
(define ((list/c-first-order c) x)
(and (list? x)
(= (length x) (length (generic-list/c-args c)))
@ -2108,5 +2111,8 @@
[else "th"])))
;; this is a hack to work around cyclic linking issues;
;; see definition of set-listof-any-and-cons/c-anyany!
(set-listof-any-and-cons/c-anyany! (listof any/c) (cons/c any/c any/c))
;; see definition of set-some-basic-contracts!
(set-some-basic-contracts!
(listof any/c)
(cons/c any/c any/c)
(list/c))