Racket Documentation Landmarks

DrRacket (the Mac app window)
Syntax Foundation
Syntactic Forms
3.2 Importing and Exporting: require and provide

Mysterious message about adding “#lang racket” to beginning of ”the definitions window”.
I saved “Untitled.rkt” in ~/play/Scheme/Racket”. That file turns out to hold the text from the upper pane of the window. Its first (and only) line is “#lang racket”.

I think that the recursive definition of syntax category require-spec has only infinite terminal productions.
2015 June 12 e-mail from Clements

For my tastes:
#lang r5rs
(define call/cc call-with-current-continuation)
(#%require (only racket/base bitwise-not bitwise-and bitwise-ior bitwise-xor arithmetic-shift))