syntax_data: {"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let ty = self.typeck_results.node_type(expr.hir_id);
context_before:                 debug!("convert_path_expr: user_ty={:?}", user_ty);
context_after:                 match ty.kind() {