3b13b9c2b4
Reject specialized Drop impls. See Issue #8142 for discussion. This makes it illegal for a Drop impl to be more specialized than the original item. So for example, all of the following are now rejected (when they would have been blindly accepted before): ```rust struct S<A> { ... }; impl Drop for S<i8> { ... } // error: specialized to concrete type struct T<'a> { ... }; impl Drop for T<'static> { ... } // error: specialized to concrete region struct U<A> { ... }; impl<A:Clone> Drop for U<A> { ... } // error: added extra type requirement struct V<'a,'b>; impl<'a,'b:a> Drop for V<'a,'b> { ... } // error: added extra region requirement ``` Due to examples like the above, this is a [breaking-change]. (The fix is to either remove the specialization from the `Drop` impl, or to transcribe the requirements into the struct/enum definition; examples of both are shown in the PR's fixed to `libstd`.) ---- This is likely to be the last thing blocking the removal of the `#[unsafe_destructor]` attribute. Fix #8142 Fix #23584 |
||
|---|---|---|
| .. | ||
| advanced-macros.md | ||
| advanced.md | ||
| arrays-vectors-and-slices.md | ||
| associated-types.md | ||
| basic.md | ||
| closures.md | ||
| comments.md | ||
| compound-data-types.md | ||
| conclusion.md | ||
| concurrency.md | ||
| crates-and-modules.md | ||
| documentation.md | ||
| error-handling.md | ||
| ffi.md | ||
| functions.md | ||
| generics.md | ||
| glossary.md | ||
| hello-cargo.md | ||
| hello-world.md | ||
| if.md | ||
| installing-rust.md | ||
| intermediate.md | ||
| iterators.md | ||
| looping.md | ||
| macros.md | ||
| match.md | ||
| method-syntax.md | ||
| more-strings.md | ||
| ownership.md | ||
| patterns.md | ||
| plugins.md | ||
| pointers.md | ||
| README.md | ||
| standard-input.md | ||
| static-and-dynamic-dispatch.md | ||
| strings.md | ||
| SUMMARY.md | ||
| testing.md | ||
| traits.md | ||
| unsafe.md | ||
| variable-bindings.md | ||
% The Rust Programming Language
Welcome! This book will teach you about the Rust Programming Language. Rust is a modern systems programming language focusing on safety and speed. It accomplishes these goals by being memory safe without using garbage collection.
"The Rust Programming Language" is split into three sections, which you can navigate through the menu on the left.
Basics
This section is a linear introduction to the basic syntax and semantics of Rust. It has individual sections on each part of Rust's syntax, and culminates in a small project: a guessing game.
After reading "Basics," you will have a good foundation to learn more about Rust, and can write very simple programs.
Intermediate
This section contains individual chapters, which are self-contained. They focus on specific topics, and can be read in any order.
After reading "Intermediate," you will have a solid understanding of Rust, and will be able to understand most Rust code and write more complex programs.
Advanced
In a similar fashion to "Intermediate," this section is full of individual, deep-dive chapters, which stand alone and can be read in any order. These chapters focus on the most complex features, as well as some things that are only available in upcoming versions of Rust.
After reading "Advanced," you'll be a Rust expert!