A symbol file that exists but cannot be read has a null uuid, which the
check against the copy already embedded reported as "would collide with a
different element". Say that the file could not be read, with its full
path and length, since a long path is the usual cause on Windows.
tst_unreadableelement makes the file unreadable through its permissions
and fails on master with the old message.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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