You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: client.rs
    path of file: ./repos/grin/src/bin/cmd
    
    the code of the file until where you have to start completion: // Copyright 2021 The Grin Developers
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/// Grin client commands
    
	pub fn verify_chain(&self, assume_valid_rangeproofs_kernels: bool) {
		let mut e = term::stdout().unwrap();
		let params = json!([assume_valid_rangeproofs_kernels]);
		writeln!(
			e,
			"Checking the state of the chain. This might take time..."
		)
		.unwrap();
		match self.send_json_request::<()>("validate_chain", &params) {
			Ok(_) => {
				if assume_valid_rangeproofs_kernels {
					writeln!(e, "Successfully validated the sum of kernel excesses! [fast_verification enabled]").unwrap()
				} else {
					writeln!(e, "Successfully validated the sum of kernel excesses, kernel signature and rangeproofs!").unwrap()
				}
			}
			Err(err) => writeln!(e, "Failed to validate chain: {:?}", err).unwrap(),
		}
		e.reset().unwrap();
	}