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765e8c75b0
Never emit `vptr` for empty/auto traits Emiting `vptr`s for empty/auto traits is unnecessary (#114942) and causes unsoundness in `trait_upcasting` (#131813). This PR should ensure that we never emit vtables for such traits. See the linked issues for more details. I'm not sure if I can add tests for the vtable layout. So this PR only adds tests for the soundness hole (i.e., the segmentation fault will disappear after this PR). Fixes #114942 Fixes #131813 Cc #65991 (tracking issue for `trait_upcasting`) r? `@WaffleLapkin` (per https://github.com/rust-lang/rust/issues/131813#issuecomment-2419969745) |
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