#std #back-compatible #polyfill

no-std standback

New standard library, old compiler

13 releases

0.2.13 Nov 17, 2020
0.2.12 Nov 17, 2020
0.2.11 Oct 7, 2020
0.2.10 Aug 23, 2020
0.1.0 Mar 6, 2020

#25 in No standard library

Download history 39588/week @ 2020-08-09 40117/week @ 2020-08-16 43903/week @ 2020-08-23 41228/week @ 2020-08-30 45452/week @ 2020-09-06 54320/week @ 2020-09-13 54004/week @ 2020-09-20 63289/week @ 2020-09-27 62314/week @ 2020-10-04 62727/week @ 2020-10-11 65721/week @ 2020-10-18 68708/week @ 2020-10-25 67801/week @ 2020-11-01 65951/week @ 2020-11-08 76654/week @ 2020-11-15 68467/week @ 2020-11-22

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Used in 944 crates (2 directly)


2.5K SLoC


build status license version rustc 1.31.0


Standback exists to allow the usage of various APIs that have been stabilized since rustc 1.31.0 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