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Auto merge of rust-lang#77723 - jonas-schievink:rollup-htz44r4, r=jon…
…as-schievink Rollup of 8 pull requests Successful merges: - rust-lang#76750 (Don't discourage implementing `core::fmt::Write`) - rust-lang#77449 (BTreeMap: comment why drain_filter's size_hint is somewhat pessimistic) - rust-lang#77660 ((docs): make mutex error comment consistent with codebase) - rust-lang#77663 (Add compile fail test for issue 27675) - rust-lang#77673 (Remove unnecessary lamda on emitter map.) - rust-lang#77701 (Make `max_log_info` easily greppable (for figuring out why debug logging is disabled)) - rust-lang#77702 (Remove not needed lambda.) - rust-lang#77710 (Update submodule llvm to get LVI bugfix) Failed merges: r? `@ghost`
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Submodule llvm-project
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/// The compiler previously did not properly check the bound of `From` when it was used from type | ||
/// of the dyn trait object (use in `copy_any` below). Since the associated type is under user | ||
/// control in this usage, the compiler could be tricked to believe any type implemented any trait. | ||
/// This would ICE, except for pure marker traits like `Copy`. It did not require providing an | ||
/// instance of the dyn trait type, only name said type. | ||
trait Setup { | ||
type From: Copy; | ||
} | ||
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fn copy<U: Setup + ?Sized>(from: &U::From) -> U::From { | ||
*from | ||
} | ||
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pub fn copy_any<T>(t: &T) -> T { | ||
copy::<dyn Setup<From=T>>(t) | ||
//~^ ERROR the trait bound `T: Copy` is not satisfied | ||
} | ||
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fn main() {} |