Upgrading a package that removes a needed provides

Installed packages:

• foo-1-1 provides foo1.
• bar-1-1 depends on foo1

Upgrade:

• foo-2-1 provides foo2
• foo1 is added to the repo

Result:

error: failed to prepare transaction (could not satisfy dependencies) 
:: installing foo (2-1) breaks dependency 'foo1' required by bar

This is tracked in our test suite: sync-update-package-removing-required-provides.py

See also: https://bugs.archlinux.org/task/74324