syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"|"}]}
source_snippet:                 | DefKind::SyntheticCoroutineBody => {
context_before:                 | DefKind::Closure
context_after:                     bug!("not an adt: {def:?} ({:?})", tcx.def_kind(def.did()))