I tried this code:
pub trait Inner{}
pub struct Wrapper(Box<dyn Inner>);
pub unsafe fn get_inner(wrapper: *mut Wrapper) -> &'static Box<dyn Inner> {
&(*wrapper).0
}I expected to see this happen: nothing happens or a valid suggestion is given
Instead, this happened: fires borrowed-box lint and suggests removing Box in return type which results in compilation error
warning: you seem to be trying to use `&Box<T>`. Consider using just `&T`
--> src/lib.rs:10:51
|
10 | pub unsafe fn get_inner(wrapper: *mut Wrapper) -> &'static Box<dyn Inner> {
| ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `&'static dyn Inner`
|
= note: `#[warn(clippy::borrowed_box)]` on by default
but using suggestion causes compile time error:
error[E0277]: the trait bound `std::boxed::Box<(dyn Inner + 'static)>: Inner` is not satisfied
--> src/lib.rs:11:5
|
11 | &(*wrapper).0
| ^^^^^^^^^^^^^ the trait `Inner` is not implemented for `std::boxed::Box<(dyn Inner + 'static)>`
|
= note: required for the cast to the object type `dyn Inner`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
Meta
Rust 1.49.0
https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=f6b0796cfa3ede3c6a695aba8e497f83
I tried this code:
I expected to see this happen: nothing happens or a valid suggestion is given
Instead, this happened: fires
borrowed-boxlint and suggests removingBoxin return type which results in compilation errorbut using suggestion causes compile time error:
Meta
Rust 1.49.0
https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=f6b0796cfa3ede3c6a695aba8e497f83