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Showing content from https://doc.rust-lang.org/nightly/nightly-rustc/rustc_session/parse/fn.feature_err.html below:

feature_err in rustc_session::parse - Rust

rustc_session

::

parse Function feature_errSource 
pub fn feature_err(
    sess: &Session,
    feature: Symbol,
    span: impl Into<MultiSpan>,
    explain: impl Into<DiagMessage>,
) -> Diag<'_>
Expand description

Construct a diagnostic for a language feature error due to the given span. The feature’s Symbol is the one you used in unstable.rs and rustc_span::symbol.

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