I'm not seeing this problem on Debian, using mit-scheme 11.2-2.
$ mit-scheme
Image saved on Wednesday August 25, 2021 at 11:53:38 AM
Release 11.2 || SF || LIAR/x86-64
1 ]=> (vector 1 2 3)
;Value: #(1 2 3)
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Bugs, which is
** Summary changed:
- Evaluating (vector 1 2 3) fails.
+ Printing vectors fails (was "Evaluating (vector 1 2 3) fails.").
** Description changed:
- #(a b c) and (list->vector '(a b c)) also fail with the error "Unbound
- variable: nmv-header?".
+ Entering (vector 1 2 3) results in the error "Unb
