i made a one-character typo that created an error without a relevant line
number. when applying a (listof predicate) in my struct's contract, i
accidentally supplied a non-predicate function -- which is very easy to do when
the predicate is the name of a struct. (i forgot the question mark.)
=====
#lang racket
(module pie racket
(struct paperclip ())
(provide (struct-out paperclip))
(struct cup (contents))
(provide (contract-out
[struct cup ((contents (listof paperclip)))])) ;bug
);mod
(require 'pie)
(define best-mom (cup '(oops)))
=====
i get the following error in DrRacket:
=====
listof: contract violation
expected: contract?
given: #<procedure:paperclip>
D:\cygwin64\usr\local\racket\collects\racket\contract\private\guts.rkt: 427:23
#'(app ctc/proc margs (... ...))
D:\cygwin64\usr\local\racket\collects\racket\contract\private\provide.rkt:
827:47 (coerce-contract
'provide/contract field-contract)
=====
is there a way to get an error message with more relevant context?
braids
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