syntax_data: {"ast_node_type":"variable","tokens":[{"end":64,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let debruijn = debruijn.shifted_in(self.amount);
context_before:             ty::ReBound(debruijn, br) if debruijn >= self.current_index => {
context_after:                 Region::new_bound(self.cx, debruijn, br)