typed-racket/typed-racket-test/fail/dviu-not-subtype.rkt
Daniel Feltey 2e0cc095c7 Initial support for typed units in typed racket.
Most unit forms are supported, including most of the "infer" forms that
infer imports/exports/linkages from the current context.

Notably, none of the structural linking forms for units are supported, and
`define-unit-binding` is also currently unsupported.
2015-09-10 16:32:11 -05:00

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Racket

#;
(exn-pred #rx"type mismatch")
#lang typed/racket
(define-signature x-sig ([x : Integer]))
(define-signature x-sub extends x-sig ([xx : Integer]))
(define u (unit (import) (export x-sig) (define x 1)))
(define-values/invoke-unit u (import) (export x-sub))