require and provide seem to exhibit strange behavior when used inside a macro.
Here, the `all-prefix' macro works (because of the 'prefix-in' somehow) while
the `all' macro doesn't.
#lang racket/base
(define-syntax-rule (all-prefix)
(begin
(require (for-meta 1 (prefix-in x: racket/base)))
(provide (for-meta 1 x:printf))))
(define-syntax-rule (all)
(begin
(require (for-meta 1 racket/base))
(provide (for-meta 1 printf))))
(all-prefix)
(all)
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