{"ast_node_type":"variable","tokens":[{"end":57,"kind":"keyword","start":0,"text":"let"}]}
    let mut llvm_c_strs = Vec::with_capacity(n_args + 1);
    let n_args = sess.opts.cg.llvm_args.len() + sess.target.llvm_args.len();
    let mut llvm_args = Vec::with_capacity(n_args + 1);