// Closures

fn main() {
    let square = (|i: i32| i * i);

    let commented = |// first
                     a, // argument
                     // second
                     b: WithType, // argument
                     // ignored
                     _| {
        (aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa, bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb)
    };

    let block_body = move |xxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
                           ref yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy| {
        xxxxxxxxxxxxxxxxxxxxxxxxxxxxx + yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
    };

    let loooooooooooooong_name = |field| {
        // TODO(#27): format comments.
        if field.node.attrs.len() > 0 {
            field.node.attrs[0].span.lo
        } else {
            field.span.lo
        }
    };

    let block_me = |field| if true_story() {
        1
    } else {
        2
    };

    let unblock_me = |trivial| closure();

    let empty = |arg| {};

    let simple = |arg| {
        // TODO(#27): comment formatting
        foo(arg)
    };

    let test = || {
        do_something();
        do_something_else();
    };

    let arg_test = |big_argument_name, test123| {
        looooooooooooooooooong_function_naaaaaaaaaaaaaaaaame()
    };

    let arg_test = |big_argument_name, test123| {
        looooooooooooooooooong_function_naaaaaaaaaaaaaaaaame()
    };

    let simple_closure = move || -> () {};

    let closure = |input: Ty| -> Option<String> { foo() };

    let closure_with_return_type = |aaaaaaaaaaaaaaaaaaaaaaarg1,
                                    aaaaaaaaaaaaaaaaaaaaaaarg2|
                                    -> Strong {
        "sup".to_owned()
    };

    |arg1, arg2, _, _, arg3, arg4| {
        let temp = arg4 + arg3;
        arg2 * arg1 - temp
    }
}

fn issue311() {
    let func = |x| println!("{}", x);

    (func)(0.0);
}

fn issue863() {
    let closure = |x| match x {
        0 => true,
        _ => false,
    } == true;
}

fn issue934() {
    let hash: &Fn(&&Block) -> u64 = &|block| -> u64 {
        let mut h = SpanlessHash::new(cx);
        h.hash_block(block);
        h.finish()
    };

    let hash: &Fn(&&Block) -> u64 = &|block| -> u64 {
        let mut h = SpanlessHash::new(cx);
        h.hash_block(block);
        h.finish();
    };
}

impl<'a, 'tcx: 'a> SpanlessEq<'a, 'tcx> {
    pub fn eq_expr(&self, left: &Expr, right: &Expr) -> bool {
        match (&left.node, &right.node) {
            (&ExprBinary(l_op, ref ll, ref lr), &ExprBinary(r_op, ref rl, ref rr)) => {
                l_op.node == r_op.node && self.eq_expr(ll, rl) && self.eq_expr(lr, rr) ||
                swap_binop(l_op.node, ll, lr).map_or(false, |(l_op, ll, lr)| {
                    l_op == r_op.node && self.eq_expr(ll, rl) && self.eq_expr(lr, rr)
                })
            }
        }
    }
}