visit_break_exprs(block, |break_expr, dest, sub_expr| {
if dest.target_id.ok() == Some(expr.hir_id) {
if call_site_span.is_none() && break_expr.span.ctxt() == ctxt {
- lint_break(cx, break_expr.span, sub_expr.unwrap().span);
+ // At this point sub_expr can be `None` in async functions which either diverge, or return the
+ // unit type.
+ if let Some(sub_expr) = sub_expr {
+ lint_break(cx, break_expr.span, sub_expr.span);
+ }
} else {
// the break expression is from a macro call, add a return to the loop
add_return = true;