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.

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