gistfile1.rs

    pub unsafe fn alloc_mega_group(mblocks: nat) -> ~Block {
        let n = MBLOCK_GROUP_BLOCKS(mblocks);
        let mut prev_link = &mut free_mblock_list.p;
        let mut best: Option<(&mut BlockData, &mut BlockMeta)> = None;
        loop {
            match prev_link {
                &None => break,
                // NB: need to match it out, so we don't take out a
                // reference on prev_link that will interfere with the
                // take()
                &Some(~Block {meta: BlockMeta {blocks, ..}, ..}) if blocks as uint == n => {
                    let mut bd = prev_link.take_unwrap();
                    *prev_link = bd.link.p.take();
                    return bd
                },
                &Some(ref mut bd) => {
                    if bd.meta.blocks as uint > n && match best {
                        None => true,
                        Some((_, ref best_meta)) => bd.meta.blocks < best_meta.blocks
                    } {
                        best = Some((&mut bd.data, &mut bd.meta))
                    }
                    prev_link = &mut bd.link.p;
                }
            }
        }
        match best {
            None => fail!("ni"),
            Some((data, meta)) => fail!("ni")
        }
    }

~~~~

BlockAlloc.rs|249 col 33 error| cannot borrow `*prev_link` as mutable more than once at a time
BlockAlloc.rs|253 col 22 n| second borrow of `*prev_link` as mutable occurs here
BlockAlloc.rs|250 col 20 error| cannot assign to `*prev_link` because it is borrowed
BlockAlloc.rs|253 col 22 n| borrow of `*prev_link` occurs here
BlockAlloc.rs|253 col 22 error| cannot borrow `(*prev_link)#0` as mutable more than once at a time
BlockAlloc.rs|253 col 22 n| second borrow of `(*prev_link)#0` as mutable occurs here
BlockAlloc.rs|260 col 20 error| cannot assign to `prev_link` because it is borrowed
BlockAlloc.rs|253 col 22 n| borrow of `prev_link` occurs here
|| error: aborting due to 4 previous errors
|| task 'rustc' failed at 'explicit failure', /build/buildd/rust-nightly-201312090405~898d2c3~saucy/src/libsyntax/diagnostic.rs:102
|| task '<main>' failed at 'explicit failure', /build/buildd/rust-nightly-201312090405~898d2c3~saucy/src/librustc/lib.rs:393