Crate features / either
Feature flags · either 1.19.0 · from crates.io 2026-10-24
either features: what each one does, and the line to copy
Short answereither 1.19.0 has 2 features. By default it turns on std; add default-features = false to start from nothing. It needs Rust 1.63.0 or newer.
Pick features
Every feature
| Feature | In default | Turns on |
|---|---|---|
std | yes | nothing else (a switch the code checks) |
use_std | std |
dep:x turns on the optional dependency x; x/y turns on feature y of dependency x (with ?, only if x is already on).
MSRV history
The minimum Rust version either declares (rust-version), and the release that changed it:
- 1.7.0 (2022-06-29): Rust 1.31
- 1.8.0 (2022-08-17): Rust 1.36
- 1.9.0 (2023-07-22): no rust-version declared
- 1.10.0 (2024-02-10): Rust 1.36
- 1.12.0 (2024-05-16): Rust 1.37
- 1.14.0 (2025-02-23): Rust 1.63.0
Stuck on an older compiler? Pin the last version that supports it, for example cargo update -p either --precise <version>, or use resolver 3, which picks compatible versions for you.
More on either
Real downloads, dependents and alternatives: either crate data (3M real downloads a day, 1,488 dependents).
docs.rs feature list · crates.io · license MIT OR Apache-2.0 · edition 2021
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