syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"ty::Bound(debruijn,"}]}
source_snippet:             ty::Bound(debruijn, bound_ty) if debruijn == self.binder_index => {
context_before:         match t.kind() {
context_after:                 let idx = bound_ty.var().as_usize();