{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"trait_span:"}]}
                            trait_span: tcx.def_span(param.def_id),
                        tcx.dcx().emit_err(errors::SelfTyNotCaptured {
                            opaque_span: tcx.def_span(opaque_def_id),