I've pushed a repair to the git repo.
The problem is in the vicinity of `syntax-local-lift-context'. We could
blame the documentation, which didn't say that the result is always
`#f' for a top-level context in any namespace. Some code using
`syntax-local-lift-context' took the special result `#f'
I'm not sure how to describe this, so I'll show the steps to reproduce
it:
$ cat foo.rkt
#lang racket/gui
(define frame (new frame% (label "hello, world")))
(define canvas (new canvas% (parent frame)))
(send frame show #t)
$ cat bar.rkt
#lang racket/gui
(define frame (new frame% (label "bye, w
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