I am trying to have my reatable recognize extra named chars like #\Home, #\End, ... but there's something I don't get...

In the following code:

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(include "~~/src/lib/header.scm")

(define extra-named-chars '(("Nul" . #\x00) ("Home" . #\x01) ("Enter" . #\x03) ("End" . #\x04)))

(define (add-extra-named-chars! readtable) (macro-readtable-named-char-table-set! readtable (append (macro-readtable-named-char-table readtable) extra-named-chars)))

(define (make-my-readtable) (let ((readtable (##readtable-copy ##main-readtable))) (add-extra-named-chars! readtable) readtable))

(define (tr) (add-extra-named-chars! ##main-readtable))

(define (tr2) (set! ##main-readtable (make-my-readtable)))

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If I do (tr) then everything works perfectly, but using tr2 doesn't work, I get Invalid '#' name: "End"

Any clue?

Thanks,

Guillaume Cartier