[racket] Macros that use local-require (hygiene issues?)

Hi All,

I've been struggling to have a macro be given a path then require something
from that path. The following code produces and "Unbound Identifier" error,
although I would expect it to evaluate to 1. Could someone provide insight
into what is going on?

#lang racket/load
;;provider
(module T racket
  (provide a)
  (define a 1))
;; requirer
(module R racket
  (require (for-syntax syntax/parse))
  (define-syntax (test-binding stx)
    (syntax-parse stx
      [(_ path)
       #'(let () (local-require (only-in path a)) a)]))
  (test-binding 'T))
;; go
(require 'R)


P.S. I attempted to do this with `dynamic-require,` but that failed because
in my actual program `path` is sometimes `(submod "..")`, which caused an
error about not having a base path.
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