Re-delay a resolve bug related to Self-ctor in patterns
#133286
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For the code pattern reported in <rust-lang#133272>, ```rs impl Foo { fn fun() { let S { ref Self } = todo!(); } } ``` <rust-lang#121208> converted this to a `span_bug` from a `span_delayed_bug` because this specific self-ctor code pattern lacked test coverage. It turns out this can be hit but we just lacked test coverage, so change it back to a `span_delayed_bug` and add a target tested case.
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For the code pattern reported in #133272,
#121208 converted this to a
span_bugfrom aspan_delayed_bugbecause this specific self-ctor code pattern lacked test coverage. It turns out this can be hit but we just lacked test coverage, so change it back to aspan_delayed_bugand add a targeted test case.Follow-up to #121208, cc @nnethercote (very good exercise to expose our test coverage gaps).
Fixes #133272.