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In this new version of Arbitrary Self Types, we no longer use the Deref trait exclusively when working out which self types are valid. Instead, we follow a chain of Receiver traits. This enables methods to be called on smart pointer types which fundamentally cannot support Deref (for instance because they are wrappers for pointers that don't follow Rust's aliasing rules). This includes: * Changes to tests appropriately * New tests for: * The basics of the feature * Ensuring lifetime elision works properly * Generic Receivers * A copy of the method subst test enhanced with Receiver This is really the heart of the 'arbitrary self types v2' feature, and is the most critical commit in the current PR. Subsequent commits are focused on: * Detecting "shadowing" problems, where a smart pointer type can hide methods in the pointee. * Diagnostics and cleanup. Naming: in this commit, the "Autoderef" type is modified so that it no longer solely focuses on the "Deref" trait, but can now consider the "Receiver" trait instead. Should it be renamed, to something like "TraitFollower"? This was considered, but rejected, because * even in the Receiver case, it still considers built-in derefs * the name Autoderef is short and snappy.
15 lines
894 B
Plaintext
15 lines
894 B
Plaintext
error[E0658]: `Box<Struct, impl FnMut(&mut Self)>` cannot be used as the type of `self` without the `arbitrary_self_types` feature
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--> $DIR/could-not-resolve-issue-121503.rs:6:35
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LL | async fn box_ref_Struct(self: Box<Self, impl FnMut(&mut Self)>) -> &u32 {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: see issue #44874 <https://github.com/rust-lang/rust/issues/44874> for more information
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= help: add `#![feature(arbitrary_self_types)]` to the crate attributes to enable
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= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
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= help: consider changing to `self`, `&self`, `&mut self`, or a type implementing `Receiver` such as `self: Box<Self>`, `self: Rc<Self>`, or `self: Arc<Self>`
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0658`.
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