[rust-lang/rust] Name resolution is confusing when crates re-exports std items

### ROOT CAUSE The issue arises because snafu re-exports `std::error::Error`, causing the compiler to reference `snafu::Error` instead of the standard one. This leads to incorrect type resolution in function return types and trait implementations. ### CODE FIX To resolve the confusion, explicitly reference `std::error::Error` wherever necessary. ```rust trait JustTrait {} #[derive(Debug)] struct JustError; impl std::fmt::Display for JustError { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { todo!() } } impl std::error::Error for JustError {} fn foo() -> impl JustTrait { Box::new(JustError) as Box } ``` The function `foo()` now explicitly returns a `Box`, ensuring the correct type is used and resolving the trait bound error.