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: documentation.rs
    path of file: ./repos/nushell/crates/nu-engine/src
    
    the code of the file until where you have to start completion: use nu_protocol::ast::{Argument, Expr, Expression, RecordItem};
use nu_protocol::debugger::WithoutDebug;
use nu_protocol::{
    ast::Call,
    engine::{EngineState, Stack},
    record, Category, Example, IntoPipelineData, PipelineData, Signature, Span, SyntaxShape, Type,
    Value,
};
use std::{collections::HashMap, fmt::Write};

use crate::eval_call;

pub fn get_full_help(
    sig: &Signature,
    examples: &[Example],
    engine_state: &Engine
    
fn nu_highlight_string(code_string: &str, engine_state: &EngineState, stack: &mut Stack) -> String {
    if let Some(highlighter) = engine_state.find_decl(b"nu-highlight", &[]) {
        let decl = engine_state.get_decl(highlighter);

        if let Ok(output) = decl.run(
            engine_state,
            stack,
            &Call::new(Span::unknown()),
            Value::string(code_string, Span::unknown()).into_pipeline_data(),
        ) {
            let result = output.into_value(Span::unknown());
            if let Ok(s) = result.coerce_into_string() {
                return s; // successfully highlighted string
            }
        }
    }
    code_string.to_string()
}