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<ol class="chapter"><li class="affix"><a href="../introduction.html">Introduction</a></li><li><a href="../editions/index.html" class="active"><strong aria-hidden="true">1.</strong> What are editions?</a></li><li><ol class="section"><li><a href="../editions/creating-a-new-project.html"><strong aria-hidden="true">1.1.</strong> Creating a new project</a></li><li><a href="../editions/transitioning-an-existing-project-to-a-new-edition.html"><strong aria-hidden="true">1.2.</strong> Transitioning an existing project to a new edition</a></li></ol></li><li><a href="../rust-2015/index.html"><strong aria-hidden="true">2.</strong> Rust 2015</a></li><li><a href="../rust-2018/index.html"><strong aria-hidden="true">3.</strong> Rust 2018</a></li><li><ol class="section"><li><a href="../rust-2018/edition-changes.html"><strong aria-hidden="true">3.1.</strong> 2018-Specific Changes</a></li><li><a href="../rust-2018/module-system/index.html"><strong aria-hidden="true">3.2.</strong> Module system</a></li><li><ol class="section"><li><a href="../rust-2018/module-system/raw-identifiers.html"><strong aria-hidden="true">3.2.1.</strong> Raw identifiers</a></li><li><a href="../rust-2018/module-system/path-clarity.html"><strong aria-hidden="true">3.2.2.</strong> Path clarity</a></li><li><a href="../rust-2018/module-system/more-visibility-modifiers.html"><strong aria-hidden="true">3.2.3.</strong> More visibility modifiers</a></li><li><a href="../rust-2018/module-system/nested-imports-with-use.html"><strong aria-hidden="true">3.2.4.</strong> Nested imports with use</a></li></ol></li><li><a href="../rust-2018/error-handling-and-panics/index.html"><strong aria-hidden="true">3.3.</strong> Error handling and panics</a></li><li><ol class="section"><li><a href="../rust-2018/error-handling-and-panics/the-question-mark-operator-for-easier-error-handling.html"><strong aria-hidden="true">3.3.1.</strong> The ? operator for easier error handling</a></li><li><a href="../rust-2018/error-handling-and-panics/question-mark-in-main-and-tests.html"><strong aria-hidden="true">3.3.2.</strong> ? in main and tests</a></li><li><a href="../rust-2018/error-handling-and-panics/controlling-panics-with-std-panic.html"><strong aria-hidden="true">3.3.3.</strong> Controlling panics with std::panic</a></li><li><a href="../rust-2018/error-handling-and-panics/aborting-on-panic.html"><strong aria-hidden="true">3.3.4.</strong> Aborting on panic</a></li></ol></li><li><a href="../rust-2018/control-flow/index.html"><strong aria-hidden="true">3.4.</strong> Control flow</a></li><li><ol class="section"><li><a href="../rust-2018/control-flow/loops-can-break-with-a-value.html"><strong aria-hidden="true">3.4.1.</strong> Loops can break with a value</a></li><li><a href="../rust-2018/control-flow/async-await-for-easier-concurrency.html"><strong aria-hidden="true">3.4.2.</strong> async/await for easier concurrency</a></li></ol></li><li><a href="../rust-2018/trait-system/index.html"><strong aria-hidden="true">3.5.</strong> Trait system</a></li><li><ol class="section"><li><a href="../rust-2018/trait-system/impl-trait-for-returning-complex-types-with-ease.html"><strong aria-hidden="true">3.5.1.</strong> impl Trait for returning complex types with ease</a></li><li><a href="../rust-2018/trait-system/dyn-trait-for-trait-objects.html"><strong aria-hidden="true">3.5.2.</strong> dyn Trait for trait objects</a></li><li><a href="../rust-2018/trait-system/more-container-types-support-trait-objects.html"><strong aria-hidden="true">3.5.3.</strong> More container types support trait objects</a></li><li><a href="../rust-2018/trait-system/associated-constants.html"><strong aria-hidden="true">3.5.4.</strong> Associated constants</a></li><li><a href="../rust-2018/trait-system/no-anon-params.html"><strong aria-hidden="true">3.5.5.</strong> No more anonymous parameters</a></li></ol></li><li><a href="../rust-2018/slice-patterns.html"><strong aria-hidden="true">3.6.</strong> Slice patterns</a></li><li><a href="../rust-2018/ownership-and-lifetimes/index.html"><strong aria-hidden="true">3.7.</strong> Ownership and lifetimes</a></li><li><ol class="section"><li><a href="../rust-2018/ownership-and-lifetimes/non-lexical-lifetimes.html"><strong aria-hidden="true">3.7.1.</strong> Non-lexical lifetimes</a></li><li><a href="../rust-2018/ownership-and-lifetimes/default-match-bindings.html"><strong aria-hidden="true">3.7.2.</strong> Default match bindings</a></li><li><a href="../rust-2018/ownership-and-lifetimes/the-anonymous-lifetime.html"><strong aria-hidden="true">3.7.3.</strong> '_, the anonymous lifetime</a></li><li><a href="../rust-2018/ownership-and-lifetimes/lifetime-elision-in-impl.html"><strong aria-hidden="true">3.7.4.</strong> Lifetime elision in impl</a></li><li><a href="../rust-2018/ownership-and-lifetimes/inference-in-structs.html"><strong aria-hidden="true">3.7.5.</strong> T: 'a inference in structs</a></li><li><a href="../rust-2018/ownership-and-lifetimes/simpler-lifetimes-in-static-and-const.html"><strong aria-hidden="true">3.7.6.</strong> Simpler lifetimes in static and const</a></li></ol></li><li><a href="../rust-2018/data-types/index.html"><strong aria-hidden="true">3.8.</strong> Data types</a></li><li><ol class="section"><li><a href="../rust-2018/data-types/field-init-shorthand.html"><strong aria-hidden="true">3.8.1.</strong> Field init shorthand</a></li><li><a href="../rust-2018/data-types/inclusive-ranges.html"><strong aria-hidden="true">3.8.2.</strong> ..= for inclusive ranges</a></li><li><a href="../rust-2018/data-types/128-bit-integers.html"><strong aria-hidden="true">3.8.3.</strong> 128 bit integers</a></li><li><a href="../rust-2018/data-types/operator-equals-are-now-implementable.html"><strong aria-hidden="true">3.8.4.</strong> "Operator-equals" are now implementable</a></li><li><a href="../rust-2018/data-types/union-for-an-unsafe-form-of-enum.html"><strong aria-hidden="true">3.8.5.</strong> union for an unsafe form of enum</a></li><li><a href="../rust-2018/data-types/choosing-alignment-with-the-repr-attribute.html"><strong aria-hidden="true">3.8.6.</strong> Choosing alignment with the repr attribute</a></li></ol></li><li><a href="../rust-2018/simd-for-faster-computing.html"><strong aria-hidden="true">3.9.</strong> SIMD for faster computing</a></li><li><a href="../rust-2018/macros/index.html"><strong aria-hidden="true">3.10.</strong> Macros</a></li><li><ol class="section"><li><a href="../rust-2018/macros/custom-derive.html"><strong aria-hidden="true">3.10.1.</strong> Custom Derive</a></li><li><a href="../rust-2018/macros/macro-changes.html"><strong aria-hidden="true">3.10.2.</strong> Macro changes</a></li><li><a href="../rust-2018/macros/at-most-once.html"><strong aria-hidden="true">3.10.3.</strong> At most one repetition</a></li></ol></li><li><a href="../rust-2018/the-compiler/index.html"><strong aria-hidden="true">3.11.</strong> The compiler</a></li><li><ol class="section"><li><a href="../rust-2018/the-compiler/improved-error-messages.html"><strong aria-hidden="true">3.11.1.</strong> Improved error messages</a></li><li><a href="../rust-2018/the-compiler/incremental-compilation-for-faster-compiles.html"><strong aria-hidden="true">3.11.2.</strong> Incremental Compilation for faster compiles</a></li><li><a href="../rust-2018/the-compiler/an-attribute-for-deprecation.html"><strong aria-hidden="true">3.11.3.</strong> An attribute for deprecation</a></li></ol></li><li><a href="../rust-2018/rustup-for-managing-rust-versions.html"><strong aria-hidden="true">3.12.</strong> Rustup for managing Rust versions</a></li><li><a href="../rust-2018/cargo-and-crates-io/index.html"><strong aria-hidden="true">3.13.</strong> Cargo and crates.io</a></li><li><ol class="section"><li><a href="../rust-2018/cargo-and-crates-io/cargo-check-for-faster-checking.html"><strong aria-hidden="true">3.13.1.</strong> cargo check for faster checking</a></li><li><a href="../rust-2018/cargo-and-crates-io/cargo-install-for-easy-installation-of-tools.html"><strong aria-hidden="true">3.13.2.</strong> cargo install for easy installation of tools</a></li><li><a href="../rust-2018/cargo-and-crates-io/cargo-new-defaults-to-a-binary-project.html"><strong aria-hidden="true">3.13.3.</strong> cargo new defaults to a binary project</a></li><li><a href="../rust-2018/cargo-and-crates-io/cargo-rustc-for-passing-arbitrary-flags-to-rustc.html"><strong aria-hidden="true">3.13.4.</strong> cargo rustc for passing arbitrary flags to rustc</a></li><li><a href="../rust-2018/cargo-and-crates-io/cargo-workspaces-for-multi-package-projects.html"><strong aria-hidden="true">3.13.5.</strong> Cargo workspaces for multi-package projects</a></li><li><a href="../rust-2018/cargo-and-crates-io/multi-file-examples.html"><strong aria-hidden="true">3.13.6.</strong> Multi-file examples</a></li><li><a href="../rust-2018/cargo-and-crates-io/replacing-dependencies-with-patch.html"><strong aria-hidden="true">3.13.7.</strong> Replacing dependencies with patch</a></li><li><a href="../rust-2018/cargo-and-crates-io/cargo-can-use-a-local-registry-replacement.html"><strong aria-hidden="true">3.13.8.</strong> Cargo can use a local registry replacement</a></li><li><a href="../rust-2018/cargo-and-crates-io/crates-io-disallows-wildcard-dependencies.html"><strong aria-hidden="true">3.13.9.</strong> Crates.io disallows wildcard dependencies</a></li></ol></li><li><a href="../rust-2018/documentation/index.html"><strong aria-hidden="true">3.14.</strong> Documentation</a></li><li><ol class="section"><li><a href="../rust-2018/documentation/new-editions-of-the-book.html"><strong aria-hidden="true">3.14.1.</strong> New editions of the "the book"</a></li><li><a href="../rust-2018/documentation/the-rust-bookshelf.html"><strong aria-hidden="true">3.14.2.</strong> The Rust Bookshelf</a></li><li><a href="../rust-2018/documentation/the-rustonomicon.html"><strong aria-hidden="true">3.14.3.</strong> The Rustonomicon</a></li><li><a href="../rust-2018/documentation/std-os-has-documentation-for-all-platforms.html"><strong aria-hidden="true">3.14.4.</strong> Full documentation for std::os</a></li></ol></li><li><a href="../rust-2018/rustdoc/index.html"><strong aria-hidden="true">3.15.</strong> rustdoc</a></li><li><ol class="section"><li><a href="../rust-2018/rustdoc/documentation-tests-can-now-compile-fail.html"><strong aria-hidden="true">3.15.1.</strong> Documentation tests can now compile-fail</a></li><li><a href="../rust-2018/rustdoc/rustdoc-uses-commonmark.html"><strong aria-hidden="true">3.15.2.</strong> Rustdoc uses CommonMark</a></li></ol></li><li><a href="../rust-2018/platform-and-target-support/index.html"><strong aria-hidden="true">3.16.</strong> Platform and target support</a></li><li><ol class="section"><li><a href="../rust-2018/platform-and-target-support/libcore-for-low-level-rust.html"><strong aria-hidden="true">3.16.1.</strong> libcore for low-level Rust</a></li><li><a href="../rust-2018/platform-and-target-support/webassembly-support.html"><strong aria-hidden="true">3.16.2.</strong> WebAssembly support</a></li><li><a href="../rust-2018/platform-and-target-support/global-allocators.html"><strong aria-hidden="true">3.16.3.</strong> Global allocators</a></li><li><a href="../rust-2018/platform-and-target-support/msvc-toolchain-support.html"><strong aria-hidden="true">3.16.4.</strong> MSVC toolchain support</a></li><li><a href="../rust-2018/platform-and-target-support/musl-support-for-fully-static-binaries.html"><strong aria-hidden="true">3.16.5.</strong> MUSL support for fully static binaries</a></li><li><a href="../rust-2018/platform-and-target-support/cdylib-crates-for-c-interoperability.html"><strong aria-hidden="true">3.16.6.</strong> cdylib crates for C interoperability</a></li></ol></li></ol></li></ol>
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<a class="header" href="#what-are-editions" id="what-are-editions"><h1>What are Editions?</h1></a>
<p>Rust ships releases on a six-week cycle. This means that users get a constant
stream of new features. This is much faster than updates for other languages,
but this also means that each update is smaller. After a while, all of those
tiny changes add up. But, from release to release, it can be hard to look back
and say <em>"Wow, between Rust 1.10 and Rust 1.20, Rust has changed a lot!"</em></p>
<p>Every two or three years, we'll be producing a new <em>edition</em> of Rust. Each
edition brings together the features that have landed into a clear package, with
fully updated documentation and tooling. New editions ship through the usual
release process.</p>
<p>This serves different purposes for different people:</p>
<ul>
<li>
<p>For active Rust users, it brings together incremental changes into an
easy-to-understand package.</p>
</li>
<li>
<p>For non-users, it signals that some major advancements have landed, which
might make Rust worth another look.</p>
</li>
<li>
<p>For those developing Rust itself, it provides a rallying point for the project as a
whole.</p>
</li>
</ul>
<a class="header" href="#compatibility" id="compatibility"><h2>Compatibility</h2></a>
<p>When a new edition becomes available in the compiler, crates must explicitly opt
in to it to take full advantage. This opt in enables editions to contain
incompatible changes, like adding a new keyword that might conflict with
identifiers in code, or turning warnings into errors. A Rust compiler will
support all editions that existed prior to the compiler's release, and can link
crates of any supported editions together.
Edition changes only affect the way the compiler initially parses the code.
Therefore, if you're using Rust 2015, and
one of your dependencies uses Rust 2018, it all works just fine. The opposite
situation works as well.</p>
<p>Just to be clear: most features will be available on all editions.
People using any edition of Rust will continue to see improvements as new
stable releases are made. In some cases however, mainly when new keywords are
added, but sometimes for other reasons, there may be new features that are only
available in later editions. You only need to upgrade if you want to take
advantage of such features.</p>
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