Rollup of 6 pull requests#155115

Merged

rust-bors[bot] merged 16 commits intorust-lang:mainfrom

JonathanBrouwer:rollup-RePrRPQ

Apr 10, 2026

Commits on Mar 30, 2026

Commits on Mar 31, 2026

Add suggestion to `.to_owned()` used on `Cow` when borrowing

Periodic1911
authored and
m4rch3n1ng
committed
apply review suggestions and move Cow sym to rustc
m4rch3n1ng
committed

Commits on Apr 8, 2026

compiletest: pass -Zunstable-options for unpretty and no-codegen paths
DeepeshWR
committed

Commits on Apr 10, 2026

Introduce a `#[diagnostic::on_unknown_item]` attribute
weiznich
committed
Address review comments
weiznich
committed
Rename the attribute to `on_unknown`
weiznich
committed
Make `rustc_attr_parsing::SharedContext::emit_lint` take a `MultiSpan` instead of a `Span`
GuillaumeGomez
committed
Reject dangling attributes in where clauses
cijiugechu
committed
Rollup merge of #152901 - weiznich:feature/on_unknown_item, r=jdonszelmann
JonathanBrouwer
authored
Rollup merge of #155078 - cijiugechu:fix/where-clause-trailing-attrs, r=petrochenkov
JonathanBrouwer
authored
Rollup merge of #154449 - nnethercote:rustc_errors-dep-rustc_abi, r=davidtwco
JonathanBrouwer
authored
Rollup merge of #154646 - m4rch3n1ng:144792-cow-diag, r=davidtwco
JonathanBrouwer
authored
Rollup merge of #154993 - DeepeshWR:compiletest-custom-target-unstable, r=davidtwco
JonathanBrouwer
authored
Rollup merge of #155097 - GuillaumeGomez:emit_lint-multispan, r=JonathanBrouwer
JonathanBrouwer
authored