[racket] syntax-rearm error.

Seems in the last 6-8 weeks or so Syntax has reignited the cold-war and is
re-arming.  Just started seeing this today after a fresh build off of the
Racket git main branch.  Haven't enough info yet to open a bug report but
thought I'd toss it out in case it jogs someones memory of a recent commit.

If I load the code in DrRacket it syntax checks just find, but fails if I
try and run the code.

Welcome to DrRacket, version 5.2.900.1--2012-03-12(01e1b1d/g) [3m].
Language: typed/racket/base; memory limit: 128 MB.
. . ../../../usr/local/racket/collects/racket/private/map.rkt:26:19:
syntax-rearm: expects type <syntax> as 1st argument, given: '(#<syntax
(#%app register-type (quote-s...>); other arguments were: #<syntax
(begin-for-syntax (#%app regi...>

Ray
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