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: tests.rs
    path of file: ./repos/rust-analyzer/crates/hir-ty/src/mir/eval
    
    the code of the file until where you have to start completion: use base_db::FileId;
use hir_def::db::DefDatabase;
use syntax::{TextRange, TextSize};
use test_fixture::WithFixture;

use crate::{db::HirDatabase, test_db::TestDB, Interner, Substitution};

use super::{interpret_mir, MirEvalError};

fn eval_main(db: &TestDB, file_id: FileId) -> Result<(String, String), MirEvalError> {
    let module_id = db.module_for_file(file_id);
    let def_map = module_id.def_map(db);
    let scope = &def_map[module_id.local_id].scope;
    let func_id = scope
        .declarations()
        .find_map(|x| match x {
            hir_def::ModuleDefId::FunctionId(x) => {
                if db.function_data(x).name.display(db).to_string() == "main" {
                    Some(x)
                } else {
                    None
                }
            }
            _ => None,
        })
        .expect("no main function found
    
fn specialization_array_clone() {
    check_pass(
        r#"
//- minicore: copy, derive, slice, index, coerce_unsized
impl<T: Clone, const N: usize> Clone for [T; N] {
    #[inline]
    fn clone(&self) -> Self {
        SpecArrayClone::clone(self)
    }
}

trait SpecArrayClone: Clone {
    fn clone<const N: usize>(array: &[Self; N]) -> [Self; N];
}

impl<T: Clone> SpecArrayClone for T {
    #[inline]
    default fn clone<const N: usize>(array: &[T; N]) -> [T; N] {
        // FIXME: panic here when we actually implement specialization.
        from_slice(array)
    }
}

fn from_slice<T, const N: usize>(s: &[T]) -> [T; N] {
    [s[0]; N]
}

impl<T: Copy> SpecArrayClone for T {
    #[inline]
    fn clone<const N: usize>(array: &[T; N]) -> [T; N] {
        *array
    }
}

#[derive(Clone, Copy)]
struct X(i32);

fn main() {
    let ar = [X(1), X(2)];
    ar.clone();
}
        "#,
    );
}