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: basic.rs
    path of file: ./repos/gluon/parser/tests
    
    the code of the file until where you have to start completion: extern crate gluon_base as base;
extern crate gluon_parser as parser;
#[macro_use]
extern crate pretty_assertions;

#[macro_use]
mod support;

use crate::support::*;

use crate::base::{
    ast::*,
    metadata::*,
    mk_ast_arena,
    pos::{self, BytePos, Span, Spanned},
    types::{Alias, Field, Type, TypeContext},
};

use crate
    
fn quote_in_identifier() {
    let _ = ::env_logger::try_init();
    let e = parse_clear_span!("let f' = \\x y -> x + y in f' 1 2");
    mk_ast_arena!(arena);
    let arena = arena.borrow();
    let a = let_(
        arena,
        "f'",
        lambda(
            arena,
            "",
            vec![intern("x"), intern("y")],
            binop(arena, id("x"), "+", id("y")),
        ),
        app(arena, id("f'"), vec![int(1), int(2)]),
    );
    assert_eq!(*e.expr(), a);
}