syntax_data: {"ast_node_type":"variable","tokens":[{"end":59,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let ty::InstantiatedPredicates { mut predicates, .. } =
context_before:     // Compute the bounds on Self and the type parameters.
context_after:         tcx.predicates_of(def_id).instantiate_identity(tcx);