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: callgrind.rs
    path of file: ./repos/cargo-profiler/src/parse
    
    the code of the file until where you have to start completion: use crate::err::ProfError;
use crate::profiler::Profiler;
use lazy_static::lazy_static;
use regex::Regex;
use std::ffi::OsStr;
use std::process::Command;

// Parser trait. To
    
    fn callgrind_cli(&self, binary: &str, binargs: &[&OsStr]) -> Result<String, ProfError> {
        // get callgrind cli output from stdout
        Command::new("valgrind")
            .arg("--tool=callgrind")
            .arg("--callgrind-out-file=callgrind.out")
            .arg(binary)
            .args(binargs)
            .output()
            .unwrap_or_else(|e| panic!("failed to execute process: {}", e));

        let cachegrind_output = Command::new("callgrind_annotate")
            .arg("callgrind.out")
            .arg(binary)
            .output()
            .unwrap_or_else(|e| panic!("failed to execute process: {}", e));

        Ok(String::from_utf8(cachegrind_output.stdout)
            .expect("error while returning cachegrind stdout"))
    }