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add error form

This commit is contained in:
Sam Caldwell 2019-05-20 14:28:38 -04:00
parent 4420f6cd74
commit ed695c66d6
1 changed files with 10 additions and 2 deletions
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12
racket/typed/core-expressions.rkt
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@ -12,10 +12,11 @@
match
tuple
select
error
(for-syntax (all-defined-out)))
(require "core-types.rkt")
(require (only-in "prim.rkt" Bool #%datum))
(require (only-in "prim.rkt" Bool String #%datum))
(require (postfix-in - racket/match))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@ -147,7 +148,7 @@
#'((x ...) ...))
--------------------------------------------------------------
[⊢ (match- e- [p- s-] ...
[_ (#%app- error "incomplete pattern match")])
[_ (#%app- error- "incomplete pattern match")])
(⇒ : (U τ-s ...))
(⇒ ν-ep (eps ... ...))
(⇒ ν-f #,(make-Branch #'((fs ...) ...)))
@ -171,6 +172,13 @@
(define- (tuple-select n t)
(#%app- list-ref- t (#%app- add1- n)))
(define-typed-syntax (error msg args ...) ≫
[⊢ msg ≫ msg- (⇐ : String)]
[⊢ args ≫ args- (⇒ : τ)] ...
#:fail-unless (all-pure? #'(msg- args- ...)) "expressions must be pure"
----------------------------------------
[⊢ (#%app- error- msg- args- ...) (⇒ : ⊥)])
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Helpers
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;