Need help in debugging GNU-sync-vc crash with 21.4.19

[Stephen J. Turnbull]

>>>>> "sjt" == Stephen J Turnbull <stephen at xemacs.org> writes:

    sjt> If you run xemacs 21.4 with

    -vanilla                                                     \
    -eval "(progn (require 'vc-hooks) (setq debug-on-error t))"  \
    /tmp/foo/foo.txt

OK, that recipe isn't quite right.  Better is

    -vanilla                                                     \
    -eval "(progn (setq debug-on-signal t) (require 'vc-hooks))" \
    /tmp/foo/foo.txt

This consistently gives me a "byte code underflow" error, in a
reasonable place (in the probe with `vc-svn-registered').  Please let
me know if you get that, too.

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