syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"ty::ReBound(debruijn,"}]}
source_snippet:         ty::ReBound(debruijn, br) if amount > 0 => {
context_before:     match region.kind() {
context_after:             Region::new_bound(cx, debruijn.shifted_in(amount), br)