syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"(ty::ConstKind::Unevaluated(au),"}]}
source_snippet:         (ty::ConstKind::Unevaluated(au), ty::ConstKind::Unevaluated(bu)) if au.def == bu.def => {
context_before:         // be stabilized.
context_after:             if cfg!(debug_assertions) {