syntax_data: {"ast_node_type":"other","tokens":[{"end":9,"kind":"keyword","start":0,"text":"{"}]}
source_snippet:         {
context_before:             && let Res::Def(DefKind::Ctor(CtorOf::Variant, CtorKind::Const), variant_ctor_id) = res
context_after:             // Check whether this is casting an enum variant discriminant.