+ if let Some(expr_id) = expr {
+ let expr = hir.expect_expr(expr_id);
+ let is_ref = tables.expr_adjustments(expr).iter().any(|adj| adj.is_region_borrow());
+ let parent = hir.get_parent_node(expr_id);
+ if let Some(hir::Node::Expr(e)) = hir.find(parent) {
+ let method_span = hir.span(parent);
+ if tables.is_method_call(e) && is_ref {
+ err.span_help(
+ method_span,
+ "consider moving this method call into a `let` \
+ binding to create a shorter lived borrow",
+ );
+ }
+ }
+ }
+