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: nu_check.rs
    path of file: ./repos/nushell/crates/nu-command/src/system
    
    the code of the file until where you have to start completion: use nu_engine::{env::get_config, find_in_dirs_env, get_dirs_var_from_call, CallExt};
use nu_parser::{parse, parse_module_block, parse_module_file_or_dir, unescape_unquote_string};
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack, StateWorkingSet};
use nu_protocol::{
    Category, Example, PipelineData, ShellError, Signature, Span, Spanned, Syntax
    
    fn examples(&self) -> Vec<Example> {
        vec![
            Example {
                description: "Parse a input file as script(Default)",
                example: "nu-check script.nu",
                result: None,
            },
            Example {
                description: "Parse a input file as module",
                example: "nu-check --as-module module.nu",
                result: None,
            },
            Example {
                description: "Parse a input file by showing error message",
                example: "nu-check --debug script.nu",
                result: None,
            },
            Example {
                description: "Parse an external stream as script by showing error message",
                example: "open foo.nu | nu-check --debug script.nu",
                result: None,
            },
            Example {
                description: "Parse an internal stream as module by showing error message",
                example: "open module.nu | lines | nu-check --debug --as-module module.nu",
                result: None,
            },
            Example {
                description: "Parse a string as script",
                example: "$'two(char nl)lines' | nu-check ",
                result: None,
            },
            Example {
                description: "Heuristically parse which begins with script first, if it sees a failure, try module afterwards",
                example: "nu-check -a script.nu",
                result: None,
            },
            Example {
                description: "Heuristically parse by showing error message",
                example: "open foo.nu | lines | nu-check --all --debug",
                result: None,
            },
        ]
    }