syntax_data: {"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:             if cfg!(debug_assertions) {
context_before:         (ty::ConstKind::Unevaluated(au), ty::ConstKind::Unevaluated(bu)) if au.def == bu.def => {
context_after:                 let a_ty = cx.type_of(au.def).instantiate(cx, au.args);