[issue43672] Raise ImportWarning when calling find_loader()

[Brett Cannon]

New submission from Brett Cannon <brett at python.org>:

Using find_loader() in the import system should raise ImportWarning to start transitioning people over to find_spec() who haven't migrated since Python 3.4.

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assignee: brett.cannon
components: Interpreter Core
messages: 389834
nosy: brett.cannon
priority: normal
severity: normal
status: open
title: Raise ImportWarning when calling find_loader()
versions: Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43672>
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