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<ol class="chapter"><li class="affix"><a href="../introduction.html">Introduction</a></li><li><a href="../editions/index.html"><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" class="active"><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="#rust-2015" id="rust-2015"><h1>Rust 2015</h1></a>
<p>Rust 2015 has a theme of "stability". It commenced with the release of 1.0,
and is the "default edition". The edition system was conceived in late 2017,
but Rust 1.0 was released in May of 2015. As such, 2015 is the edition
that you get when you don't specify any particular edition, for backwards
compatibility reasons.</p>
<p>"Stability" is the theme of Rust 2015 because 1.0 marked a huge change in
Rust development. Previous to Rust 1.0, Rust was changing on a daily basis.
This made it very difficult to write large software in Rust, and made it
difficult to learn. With the release of Rust 1.0 and Rust 2015, we committed
to backwards compatibility, ensuring a solid foundation for people to build
projects on top of.</p>
<p>Since it's the default edition, there's no way to port your code to Rust
2015; it just <em>is</em>. You'll be transitioning <em>away</em> from 2015, but never
really <em>to</em> 2015. As such, there's not much else to say about it!</p>
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