Add doc comment

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bjorn3 2022-06-08 14:31:36 +00:00
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//! lib-proc-macro diagnostic
//!
//! Copy from <https://github.com/rust-lang/rust/blob/e45d9973b2665897a768312e971b82cc62633103/src/libproc_macro/diagnostic.rs>
//! augmented with removing unstable features
use super::Span;
/// An enum representing a diagnostic level.