syntax_data: {"ast_node_type":"variable","tokens":[{"end":74,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let ty = self.typeck_results.node_type(anon_const.hir_id);
context_before:             hir::ExprKind::ConstBlock(ref anon_const) => {
context_after:                 let did = anon_const.def_id.to_def_id();