I'm using etags for the first time in a long while, and it has an
infinite loop buffer-tag-table-list.
tags-check-parent-directories-for-tag-files is at its default setting
of t so etags goes up the parent directories as expected. It does
this by running (expand-file-name ".." cur). When cur is "/",
(expand-file-name ".." cur) returns "/..". Then (expand-file-name
".." cur) returns "/" and we continue around again.
Perhaps the check should look for cur equal to "/" and stop? (What
about Windows machines?)
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