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: abi.rs
    path of file: ./repos/wasmtime/cranelift/codegen/src/machinst
    
    the code of the file until where you have to start completion: //! Implementation of a vanilla ABI, shared between several machines. The
//! implementation here assumes that arguments will be passed in registers
//! first, 
    
    pub fn init(&mut self, sigs: &SigSet, temps: Vec<Writable<Reg>>) {
        let mut temps_iter = temps.into_iter();
        for arg in sigs.args(self.sig) {
            let temp = match arg {
                &ABIArg::ImplicitPtrArg { pointer, .. } => match &pointer {
                    &ABIArgSlot::Reg { .. } => None,
                    &ABIArgSlot::Stack { .. } => Some(temps_iter.next().unwrap()),
                },
                _ => None,
            };
            self.arg_temp_reg.push(temp);
        }
        if sigs[self.sig].stack_ret_arg.is_some() {
            self.ret_area_ptr = Some(temps_iter.next().unwrap());
        }
    }