Correct typo

`bust be an` → `must be a`
This commit is contained in:
Matthew Butterick 2017-07-02 19:58:33 -07:00 committed by Ben Greenman
parent b2b53d61a1
commit 442c2fdfaf

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@ -260,7 +260,7 @@ of the corresponding @racket[method-id]s, and replaces the method
implementation with the result. implementation with the result.
A @racket[props-expr] can provide properties to attach to the A @racket[props-expr] can provide properties to attach to the
impersonator. The result of @racket[props-expr] bust be an list with impersonator. The result of @racket[props-expr] must be a list with
an even number of elements, where the first element of the list is an an even number of elements, where the first element of the list is an
impersonator property, the second element is its value, and so on. impersonator property, the second element is its value, and so on.