bad pass

// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use rustc::ty::TyCtxt;
use rustc::mir::repr::*;
use rustc::mir::transform::{MirPass, MirSource, Pass};
use rustc::mir::visit::{Visitor, LvalueContext};
use std::collections::{HashMap, HashSet};
use rustc_data_structures::tuple_slice::TupleSlice;

pub struct BadPass;

impl Pass for BadPass {}

impl<'tcx> MirPass<'tcx> for BadPass {
    fn run_pass<'a>(&mut self,
                    tcx: TyCtxt<'a, 'tcx, 'tcx>,
                    src: MirSource,
                    mir: &mut Mir<'tcx>) {

    }
}

#[derive(Debug, Eq, PartialEq, Copy, Clone, Hash)]
struct UseDefLocation {
    basic_block: BasicBlock,
    inner_location: InnerLocation,
}

impl UseDefLocation {
    fn print(&self, mir: &Mir) {
        let ref bb = mir[self.basic_block];
        match self.inner_location {
            InnerLocation::StatementIndex(idx) => {
                debug!("{:?}", bb.statements[idx]);
            },
            InnerLocation::Terminator => {
                debug!("{:?}", bb.terminator);
            }
        }
    }
}

#[derive(Debug, Eq, PartialEq, Copy, Clone, Hash)]
enum InnerLocation {
    StatementIndex(usize),
    Terminator,
}