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: mod.rs
    path of file: ./repos/diem/language/move-lang/src/to_bytecode
    
    the code of the file until where you have to start completion: // Copyright (c) The Diem Core Contributors
// SPDX-License-Identifier: Apache-2.0

#[macro_use]
mod context;
mod remove_fallt
    
fn remap_labels(blocks: &mut IR::BytecodeBlocks, map: &HashMap<IR::BlockLabel, IR::BlockLabel>) {
    use IR::Bytecode_ as B;
    for (_, block) in blocks {
        for instr in block {
            match &mut instr.value {
                B::Branch(lbl) | B::BrTrue(lbl) | B::BrFalse(lbl) => {
                    *lbl = map[lbl].clone();
                }
                _ => (),
            }
        }
    }
}