syntax_data: {"ast_node_type":"variable","tokens":[{"end":90,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let user_ty = user_provided_types.get(expr.hir_id).copied().map(Box::new);
context_before:                 let user_provided_types = self.typeck_results.user_provided_types();
context_after:                 debug!("convert_path_expr: user_ty={:?}", user_ty);