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    // Copyright 2016 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    // implements the unary operator "op &T"
    // based on "op T" where T is expected to be `Copy`able
    macro_rules! forward_ref_unop {
        (impl $imp:ident, $method:ident for $t:ty) => {
            forward_ref_unop!(impl $imp, $method for $t,
                    #[stable(feature = "rust1", since = "1.0.0")]);
        };
        (impl $imp:ident, $method:ident for $t:ty, #[$attr:meta]) => {
            #[$attr]
            impl<'a> $imp for &'a $t {
                type Output = <$t as $imp>::Output;

                #[inline]
                fn $method(self) -> <$t as $imp>::Output {
                    $imp::$method(*self)
                }
            }
        }
    }

    // implements binary operators "&T op U", "T op &U", "&T op &U"
    // based on "T op U" where T and U are expected to be `Copy`able
    macro_rules! forward_ref_binop {
        (impl $imp:ident, $method:ident for $t:ty, $u:ty) => {
            forward_ref_binop!(impl $imp, $method for $t, $u,
                    #[stable(feature = "rust1", since = "1.0.0")]);
        };
        (impl $imp:ident, $method:ident for $t:ty, $u:ty, #[$attr:meta]) => {
            #[$attr]
            impl<'a> $imp<$u> for &'a $t {
                type Output = <$t as $imp<$u>>::Output;

                #[inline]
                fn $method(self, other: $u) -> <$t as $imp<$u>>::Output {
                    $imp::$method(*self, other)
                }
            }

            #[$attr]
            impl<'a> $imp<&'a $u> for $t {
                type Output = <$t as $imp<$u>>::Output;

                #[inline]
                fn $method(self, other: &'a $u) -> <$t as $imp<$u>>::Output {
                    $imp::$method(self, *other)
                }
            }

            #[$attr]
            impl<'a, 'b> $imp<&'a $u> for &'b $t {
                type Output = <$t as $imp<$u>>::Output;

                #[inline]
                fn $method(self, other: &'a $u) -> <$t as $imp<$u>>::Output {
                    $imp::$method(*self, *other)
                }
            }
        }
    }

    // implements "T op= &U", based on "T op= U"
    // where U is expected to be `Copy`able
    macro_rules! forward_ref_op_assign {
        (impl $imp:ident, $method:ident for $t:ty, $u:ty) => {
            forward_ref_op_assign!(impl $imp, $method for $t, $u,
                    #[stable(feature = "op_assign_builtins_by_ref", since = "1.22.0")]);
        };
        (impl $imp:ident, $method:ident for $t:ty, $u:ty, #[$attr:meta]) => {
            #[$attr]
            impl<'a> $imp<&'a $u> for $t {
                #[inline]
                fn $method(&mut self, other: &'a $u) {
                    $imp::$method(self, *other);
                }
            }
        }
    }

    #[cfg(stage0)]
    macro_rules! public_in_stage0 {
        ( { $(#[$attr:meta])* } $($Item: tt)*) => {
            $(#[$attr])* pub $($Item)*
        }
    }

    #[cfg(not(stage0))]
    macro_rules! public_in_stage0 {
        ( { $(#[$attr:meta])* } $($Item: tt)*) => {
            $(#[$attr])* pub(crate) $($Item)*
        }
    }

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