`racket/string` needs to be required _for syntax_ in order to work in the 
suggested way (because it's bindings are needed at compile time).

The following works for me in a module:

#lang racket/base

(require (for-syntax racket/base racket/string)

(require (filtered-in
          (λ (name)
            (string-replace name "->" "→"))

(string→number "42")

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