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: instance.rs
    path of file: ./repos/lucet/lucet-runtime/lucet-runtime-internals/src
    
    the code of the file until where you have to start completion: pub mod execution;
mod siginfo_ext;
pub mod sig
    
    pub fn as_exitcode(&self) -> Option<u32> {
        match self {
            TerminationDetails::Provided { provided, .. } => {
                // I apologize for this load-bearing `as u32`.
                // Wasi uses an u32 for the proc_exist status (`lucet_wasi::Exitcode`) in the
                // witx. However, wasmtime::Trap exit status is an i32, so the
                // wiggle::Trap::I32Exit variant mirrors Wasmtime. The `as u32` lets this method
                // return a type equivalent to `lucet_wasi::Exitcode`, but users interested in the
                // full range of `wiggle::Trap` will have to handle an i32 variant.
                match provided.downcast_ref::<wiggle::Trap>() {
                    Some(wiggle::Trap::I32Exit(code)) => Some(*code as u32),
                    _ => None,
                }
            }
            _ => None,
        }
    }