Function clippy_utils::diagnostics::span_lint_and_then

pub fn span_lint_and_then<C, S, F>(
    cx: &C,
    lint: &'static Lint,
    sp: S,
    msg: &str,
    f: F
)
where
    C: LintContext,
    S: Into<MultiSpan>,
    F: FnOnce(&mut Diag<'_, ()>),

Like span_lint but allows to add notes, help and suggestions using a closure.

If you need to customize your lint output a lot, use this function. If you change the signature, remember to update the internal lint CollapsibleCalls