It looks to me like TR can’t generate contracts for prefab structs in a way that I would expect it to. Specifically, here’s a TR file and a Racket file that uses a TR-defined prefab structure:
makes-foo.rkt: #lang typed/racket (provide (struct-out Foo) get-a-foo) (struct Foo ([a : String]) #:prefab) (define (get-a-foo) (Foo "oeuth”)) uses-foo.rkt: #lang racket (require "makes-foo.rkt") (define a (get-a-foo)) This doesn’t typecheck (at least not in version 126.96.36.199--2017-11-05, tell me if I should just upgrade), with the message: Type Checker: could not convert type to a contract; contract generation not supported for this type identifier: get-a-foo type: (-> Foo) in: (get-a-foo) My first thought was that this was related to mutability, but the docs and my experiments suggest that prefab structures are default-immutable, and that this is reflected in a way that should be visible to the type-checker. Am I missing something, or is this just something that we haven’t yet had time to implement? John -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.