backtrace--print-frame was deleted in emacs 27+, use alternate. #70
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This should have been caught via unit tests, and it did, I just didn't actually set the env-var for the unit test run correctly. I will automate that in another PR.
I decided to
(require 'backtrace)
dynamically, only when we actually need it, as it's not defined in emacs 26. In some future world when 26 support is dead (4 years from now?) I will move it to the top level requires.The commit is emacs-mirror/emacs@83af893