syntax_data: {"ast_node_type":"other","tokens":[{"end":25,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // be stabilized.
context_before:         // and is the better alternative to waiting until `generic_const_exprs` can
context_after:         (ty::ConstKind::Unevaluated(au), ty::ConstKind::Unevaluated(bu)) if au.def == bu.def => {