## Rust version compatibility

SNAFU is tested and compatible back to Rust 1.65, released on
2022-11-03. Compatibility is controlled by Cargo feature flags.

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## `rust_1_81`

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<dt>Default</dt>
<dd>enabled</dd>
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When enabled, SNAFU will assume that it's safe to target features
available in Rust 1.81. Notably, the [`core::error::Error`][] trait is
used instead of [`std::error::Error`][].
