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.
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
impersonator property, the second element is its value, and so on.