Function add_feature_diagnostics_for_issue

pub fn add_feature_diagnostics_for_issue<G: EmissionGuarantee>(
    err: &mut Diag<'_, G>,
    sess: &Session,
    feature: Symbol,
    issue: GateIssue,
    feature_from_cli: bool,
    inject_span: Option<Span>,
)

Adds the diagnostics for a feature to an existing error.

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 add_feature_diagnostics.