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Two types definitely overlap if they are equal.

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Fixes infinite loop in Whalesong compilation.
This commit is contained in:
Sam Tobin-Hochstadt 2011-09-16 17:19:47 -04:00
parent 2570fae481
commit c55cceed8c
1 changed files with 3 additions and 2 deletions
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5
collects/typed-racket/types/remove-intersect.rkt
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@ -1,8 +1,8 @@
#lang scheme/base
(require "../utils/utils.rkt"
(rep type-rep rep-utils)
(types union subtype resolve convenience utils)
(rep type-rep rep-utils)
(types union subtype resolve convenience utils)
racket/match mzlib/trace)
(provide (rename-out [*remove remove]) overlap)
@ -11,6 +11,7 @@
(define (overlap t1 t2)
(let ([ks (Type-key t1)] [kt (Type-key t2)])
(cond
[(type-equal? t1 t2) #t]
[(and (symbol? ks) (symbol? kt) (not (eq? ks kt))) #f]
[(and (symbol? ks) (pair? kt) (not (memq ks kt))) #f]
[(and (symbol? kt) (pair? ks) (not (memq kt ks))) #f]