Asuka Minato
d3a75c9017
Added the regression test unsized_from_keeps_type_info that builds minimal MyBox/MyRc stand-ins with CoerceUnsized + From to mirror the original Rc::from(Box<[i32]>) scenario and assert that the inferred type for rc stays MyRc<[i32]>. The fixture uses only minicore pieces (coerce_unsized, from) so it exercises the unsized coercion path entirely within the test harness, ensuring we’ll catch future regressions without needing real Box/Rc.
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