syntax_data: {"ast_node_type":"variable","tokens":[{"end":46,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let ty = typeck_results.node_type(hir_id);
context_before:     debug!("user_subts_applied_to_ty_of_hir_id: user_ty={:?}", user_ty);
context_after:     match ty.kind() {