{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"err.span_note(self.cast_span,"}]}
                    err.span_note(self.cast_span, "trying to cast to a mutable reference type");
                    err.span_note(self.expr_span, "this reference is immutable");
                } else if let Some((sugg, remove_cast)) = sugg {