feature_warn_issue in rustc_session::errors - Rust
Description: Construct a future incompatibility diagnostic for a feature gate.

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## feature_warn_issue

# Function feature_warn_issue

Source

    pub fn feature_warn_issue(
        sess: &Session,
        feature: Symbol,
        span: Span,
        issue: GateIssue,
        explain: &'static str,
    )

Expand description

Construct a future incompatibility diagnostic for a feature gate.

This diagnostic is only a warning and does not cause compilation to fail.

This variant allows you to control whether it is a library or language feature. Almost always, you want to use this for a language feature. If so, prefer `feature_warn`.