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/mos/mos/src/test_runner
    
    the code of the file until where you have to start completion: use crate::diagnostic_emitter::MosResult;
use crate::memory_accessor::{ensure_ram_fn, MemoryAccessor};
use crate::utils::paint;
use ansi_term::Colour;
use codespan_reporting::diagnostic::Diagnostic;
use emulator_6502::{Interface6502, MOS6502};
use itertools::Itertools;
use mos_core::codegen::{
    codegen, Assertion, CodegenContext, Codegen
    
    fn nested_lookups() -> MosResult<()> {
        let mut runner = get_runner(
            r#"
            .test "a" {
                .const foo = 1
                label: {
                    .const foo = 2
                    .assert foo == 2
                    .assert super.foo == 1
                }
                .assert foo == 1
                .assert label.foo == 2
                brk
             }"#,
            idpath!("a"),
        )?;
        assert_eq!(runner.run()?, ExecuteResult::TestSuccess(0));
        Ok(())
    }