syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"self,"}]}
source_snippet:     self, PolyTraitPredicate, SizedTraitKind, TraitPredicate, TraitRef, Ty, TyCtxt, TypeFoldable,
context_before: use rustc_middle::ty::{
context_after:     TypeFolder, TypeSuperFoldable, TypeVisitableExt,