syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"cx.thir.params"}]}
source_snippet:         cx.thir.params = closure_env_param.into_iter().chain(explicit_params).collect();
context_before:         let explicit_params = cx.explicit_params(owner_id, fn_decl, &body);