syntax_data: {"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"_"}]}
source_snippet:         _ => return ty::Const::new_misc_error(tcx),
context_before:         (ast::LitKind::Err(guar), _) => return ty::Const::new_error(tcx, guar),
context_after:     };