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: ptr.rs
    path of file: ./repos/enigma/enigma/src/instruction
    
    the code of the file until where you have to start completion: use crate::atom::Atom;
use crate::loader::{FuncInfo, LINE_INVALID_LOCATION};
use crate::module::{Module, MFA};
use crate::value::{self, CastFrom, Term};

#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Hash, Debug)]
pub struct InstrPtr {
    /// Module containing the instruction set.
    pub module: *const Module,
    /// Offset to the current instruction.
    pub ptr: u32,
}

unsafe impl Send for InstrPtr {}
unsafe impl Sync for InstrPtr {}

impl InstrPtr {
    pub fn new(module: *const Module, ptr: u32) -> Self {
        InstrPtr { module, ptr }
    }

    #[inline(always)]
    pub fn get_module<'a, 'b>(&'a self) -> &'b Module {
        unsafe { &(*self.module) }
    }

    // typedef struct {
    //     ErtsCodeMFA* mfa;		/* Pointer to: Mod, Name, Arity */
    //     Uint 
    
    pub fn lookup_loc(&self) -> Option<FuncInfo> {
        // TODO limit search scope in the future by searching between (current func, currentfunc+1);
        let module = unsafe { &(*self.module) };

        let mut low = 0;
        let mut high = module.lines.len() - 1;

        while high > low {
            let mid = low + (high - low) / 2;
            let ptr = self.ptr as usize;
            if ptr < module.lines[mid].pos {
                high = mid;
            } else if ptr < module.lines[mid + 1].pos {
                let res = module.lines[mid];

                if res.loc == LINE_INVALID_LOCATION {
                    return None;
                }

                // TODO: fname
                return Some((0, res.loc as u32)); // unsafe cast
            } else {
                low = mid + 1;
            }
        }
        None
    }