[racket-dev] regexp-split produces immutable cons when rnrs/base-6 is required

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Hi,

regexp-split produces an immutable cons when rnrs/base-6 is required:

$ echo "m" | racket -e '(require rnrs/base-6) (car (regexp-split " +"
(read-line (current-input-port))))
'mcar: expects argument of type <mutable-pair>; given '("m")

but

$ echo "m" | racket -e '(require rnrs/base-6) (car (list (read-line
(current-input-port))))'
"m"

so apparently regexp-split is the culprit,

Marijn
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