syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // Attribute scope exit drops to scope's closing brace.
context_before:                 let region_scope_span = region_scope.span(self.tcx, self.region_scope_tree);
context_after:                 let scope_end = self.tcx.sess.source_map().end_point(region_scope_span);