syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"sess.dcx().emit_err(MultipleMutBorrows"}]}
source_snippet:         sess.dcx().emit_err(MultipleMutBorrows { span: pat.span, occurrences });
context_before:         // Report mutability conflicts for e.g. `ref mut x @ Some(ref mut y)`.
context_after:     } else if report_mut_ref {