#std #back-compatible #polyfill

no-std standback

New standard library, old compiler

18 releases

new 0.3.3 Jun 16, 2021
0.3.1 Apr 6, 2021
0.2.17 Mar 22, 2021
0.2.14 Dec 30, 2020
0.2.1 Mar 13, 2020

#64 in Rust patterns

Download history 123352/week @ 2021-02-24 124730/week @ 2021-03-03 132015/week @ 2021-03-10 134295/week @ 2021-03-17 135242/week @ 2021-03-24 120658/week @ 2021-03-31 133893/week @ 2021-04-07 130895/week @ 2021-04-14 128522/week @ 2021-04-21 128292/week @ 2021-04-28 126943/week @ 2021-05-05 133748/week @ 2021-05-12 128333/week @ 2021-05-19 131980/week @ 2021-05-26 126860/week @ 2021-06-02 111053/week @ 2021-06-09

549,906 downloads per month
Used in 1,404 crates (2 directly)


3.5K SLoC


build status license version rustc 1.36.0


Standback exists to allow the usage of various APIs that have been stabilized since rustc 1.36.0 without having to require users to upgrade their compiler. The best part? Only old features are built from scratch; anything stable on the compiler in use will just be re-exported.

Note that it is sometimes the case that newly stabilized methods would require internal methods, direct access to fields, or nightly features to work. As such, not every feature is backported. Found a neat way to implement a method or type that is possible on stable? Pull requests are accepted!


A majority of this code comes directly from the Rust standard library, where its license is the following. All new code is also released under this license.

This project is licensed under either of

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in time by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

No runtime deps