9.1.0.9
9 Web
9.1 Dispatch
| (require toolbox/web/dispatch) | package: toolbox-web-lib |
syntax
(define-enum-bidi-match-expander id syms-expr)
syms-expr : (listof symbol?)
Binds id as a bi-directional match expander like symbol-arg, but additionally constrained to be one of the symbols in the list produced by syms-expr.
Examples:
> (define-enum-bidi-match-expander language-arg '(racket rhombus)) > (match "racket" [(language-arg l) l]) 'racket
> (match "rhombus" [(language-arg l) l]) 'rhombus
> (match "cheesecake" [(language-arg l) l]) match: no matching clause for "cheesecake"