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

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`
2022-12-28 15:51:41 +08:00 · 2022-12-28 15:51:41 +08:00 · 8b3d0c4cf9
commit 8b3d0c4cf9
parent ade9605a08 b656e24130
11 changed files with 167 additions and 0 deletions
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@ -943,6 +943,7 @@ symbols! {
        mul,
        mul_assign,
        mul_with_overflow,
+        multiple_supertrait_upcastable,
        must_not_suspend,
        must_use,
        naked,