syntax_data: {"ast_node_type":"variable","tokens":[{"end":49,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let source_info = self.source_info(span);
context_before:         let borrow_kind = super::util::ref_pat_borrow_kind(mutability);
context_after:         let re_erased = self.tcx.lifetimes.re_erased;