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infer a type for fields sans declared type

This commit is contained in:
Sam Caldwell 2020-10-23 14:51:07 -04:00
parent 4cd90a6295
commit e75af5ae1c
1 changed files with 18 additions and 11 deletions
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29
racket/typed/roles.rkt
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@ -156,17 +156,24 @@
(⇒ : ★/t)
(⇒ ν-f (τ))])
(define-typed-syntax (field [x:id τ-f:type e:expr] ...) ≫
#:fail-unless (stx-andmap flat-type? #'(τ-f ...)) "keep your uppity data outta my fields"
[⊢ e ≫ e- (⇐ : τ-f)] ...
#:fail-unless (stx-andmap pure? #'(e- ...)) "field initializers not allowed to have effects"
#:with (x- ...) (generate-temporaries #'(x ...))
#:with (τ ...) (stx-map type-eval #'((Field τ-f.norm) ...))
#:with MF (type-eval #'MakesField)
----------------------------------------------------------------------
[⊢ (erased (field/intermediate [x x- τ e-] ...))
(⇒ : ★/t)
(⇒ ν-ep (MF))])
(define-typed-syntax field
[(_ [x:id τ-f:type e:expr] ...) ≫
#:cut
#:fail-unless (stx-andmap flat-type? #'(τ-f ...)) "keep your uppity data outta my fields"
[⊢ e ≫ e- (⇐ : τ-f)] ...
#:fail-unless (stx-andmap pure? #'(e- ...)) "field initializers not allowed to have effects"
#:with (x- ...) (generate-temporaries #'(x ...))
#:with (τ ...) (stx-map type-eval #'((Field τ-f.norm) ...))
#:with MF (type-eval #'MakesField)
----------------------------------------------------------------------
[⊢ (erased (field/intermediate [x x- τ e-] ...))
(⇒ : ★/t)
(⇒ ν-ep (MF))]]
[(_ flds ... [x:id e:expr] more-flds ...) ≫
#:cut
[⊢ e ≫ e- (⇒ : τ)]
--------------------
[≻ (field flds ... [x τ e-] more-flds ...)]])
(define-typed-syntax (assert e:expr) ≫
[⊢ e ≫ e- (⇒ : τ)]