| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License.. |
| |
| //! The Rust Prelude. |
| //! |
| //! Rust comes with a variety of things in its standard library. However, if |
| //! you had to manually import every single thing that you used, it would be |
| //! very verbose. But importing a lot of things that a program never uses isn't |
| //! good either. A balance needs to be struck. |
| //! |
| //! The *prelude* is the list of things that Rust automatically imports into |
| //! every Rust program. It's kept as small as possible, and is focused on |
| //! things, particularly traits, which are used in almost every single Rust |
| //! program. |
| //! |
| //! On a technical level, Rust inserts |
| //! |
| pub mod v1; |
| |
| /// The 2015 version of the prelude of The Rust Standard Library. |
| /// |
| /// See the [module-level documentation](self) for more. |
| #[cfg(enable_prelude_version)] |
| pub mod rust_2015 { |
| #[doc(no_inline)] |
| pub use super::v1::*; |
| } |
| |
| /// The 2018 version of the prelude of The Rust Standard Library. |
| /// |
| /// See the [module-level documentation](self) for more. |
| #[cfg(enable_prelude_version)] |
| pub mod rust_2018 { |
| #[doc(no_inline)] |
| pub use super::v1::*; |
| } |
| |
| /// The 2021 version of the prelude of The Rust Standard Library. |
| /// |
| /// See the [module-level documentation](self) for more. |
| #[cfg(enable_prelude_version)] |
| pub mod rust_2021 { |
| #[doc(no_inline)] |
| pub use super::v1::*; |
| |
| #[doc(no_inline)] |
| pub use core::prelude::rust_2021::*; |
| } |