syntax_data: {"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let scope_end = self.tcx.sess.source_map().end_point(region_scope_span);
context_before:                 let region_scope_span = region_scope.span(self.tcx, self.region_scope_tree);