Auto merge of #69573 - pnkfelix:issue-53114-add-tests, r=Centril

tests encoding current behavior for various cases of "binding" to _.

The `_` binding form is special, in that it encodes a "no-op": nothing is actually bound, and thus nothing is moved or borrowed in this scenario. Usually we do the "right" thing in all such cases. The exceptions are explicitly pointed out in this test case, so that we keep track of whether they are eventually fixed.

Cc #53114.

(This does not close the aforementioned issue; it just adds the tests encoding the current behavior, which we hope to eventually fix.)

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