syntax_data: {"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let did = anon_const.def_id.to_def_id();
context_before:                 let ty = self.typeck_results.node_type(anon_const.hir_id);
context_after:                 let typeck_root_def_id = tcx.typeck_root_def_id(did);