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Rollup merge of #105484 - nbdd0121:upcast, r=compiler-errors

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Implement allow-by-default `multiple_supertrait_upcastable` lint

The lint detects when an object-safe trait has multiple supertraits.

Enabled in libcore and liballoc as they are low-level enough that many embedded programs will use them.

r? `@nikomatsakis`
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fee1-dead 2022-12-28 15:51:41 +08:00 • committed by GitHub
commit 8b3d0c4cf9
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2
compiler/rustc_feature/src/active.rs
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@ -160,6 +160,8 @@ declare_features! (
(active, intrinsics, "1.0.0", None, None),
/// Allows using `#[lang = ".."]` attribute for linking items to special compiler logic.
(active, lang_items, "1.0.0", None, None),
/// Allows the `multiple_supertrait_upcastable` lint.
(active, multiple_supertrait_upcastable, "CURRENT_RUSTC_VERSION", None, None),
/// Allows using `#[omit_gdb_pretty_printer_section]`.
(active, omit_gdb_pretty_printer_section, "1.5.0", None, None),
/// Allows using `#[prelude_import]` on glob `use` items.