/usr/share/racket/pkgs/plai-lib/main.rkt is in racket-common 6.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #lang racket
(require plai/datatype
         plai/test-harness)
(provide (all-from-out plai/datatype)
         (except-out (all-from-out racket) error (for-syntax error) #%module-begin provide)
         (except-out (all-from-out plai/test-harness) plai-error)
         (rename-out [plai-error error] 
                     [plai-module-begin #%module-begin])
         (rename-out [plai-provide provide]))
(define-syntax (plai-provide stx)
  (raise-syntax-error #f "The PLAI language provides all defined names" stx))
(define-syntax (plai-module-begin stx)
  (syntax-case stx ()
    [(_ body ...)
     #`(#%module-begin
        (provide #,(datum->syntax stx '(all-defined-out)))
        body ...)]))
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