Function rustc_middle::lint::lint_level

pub fn lint_level(
    sess: &Session,
    lint: &'static Lint,
    level: Level,
    src: LintLevelSource,
    span: Option<MultiSpan>,
    msg: impl Into<DiagnosticMessage>,
    decorate: impl for<'a, 'b> FnOnce(&'b mut DiagnosticBuilder<'a, ()>)
)

The innermost function for emitting lints.

If you are looking to implement a lint, look for higher level functions, for example:

• TyCtxt::emit_node_span_lint
• TyCtxt::node_span_lint
• TyCtxt::emit_node_lint
• TyCtxt::node_lint
• LintContext::opt_span_lint

decorate

It is not intended to call emit/cancel on the DiagnosticBuilder passed in the decorate callback.