syntax_data: {"ast_node_type":"variable","tokens":[{"end":43,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:     if let ty::Adt(def, args) = ty.kind() {
context_before: ) -> Option<SmallVec<[Ty<'tcx>; 2]>> {
context_after:         let mut did = def.did();