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: args.rs
    path of file: ./repos/wasmi/crates/cli/src
    
    the code of the file until where you have to start completion: use anyhow::{Context, Error, Result};
use clap::{Parser, ValueEnum};
use std::{
    ffi::OsStr,
    net::SocketAddr,
    path::{Path, PathBuf},
    str::FromStr,
};
use wasmi_wasi::{ambient_authority, Dir, TcpListener, WasiCtx, WasiCtxBuilder};

/// A CLI flag value key-value argument.
#[derive(Debug, Clone)]
struct KeyValue {
    key: String,
    value: String,
}

impl FromSt
    
    fn argv(&self) -> Vec<String> {
        let mut args = Vec::with_capacity(self.func_args.len() + 1);
        // The WebAssembly filename is expected to be the first argument to WASI.
        // Note that the module name still has it's `.wasm` file extension.
        let module_name = self
            .wasm_file
            .file_name()
            .and_then(OsStr::to_str)
            .unwrap_or("")
            .into();
        args.push(module_name);
        args.extend_from_slice(&self.func_args);
        args
    }