Rollup merge of #134509 - adetaylor:niche-deshadowing-tests, r=wesleywiser

Arbitrary self types v2: niche deshadowing test

Arbitrary self types v2 attempts to detect cases where methods in an "outer" type (e.g. a smart pointer) might "shadow" methods in the referent.

There are a couple of cases where the current code makes no attempt to detect such shadowing. Both of these cases only apply if other unstable features are enabled.

Add a test, mostly for illustrative purposes, so we can see the shadowing cases that can occur.

Part of #44874
r? ```@wesleywiser```

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