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-

/// A macro for defining #[cfg] if-else statements.
-///
-/// This is similar to the `if/elif` C preprocessor macro by allowing definition
-/// of a cascade of `#[cfg]` cases, emitting the implementation which matches
-/// first.
-///
-/// This allows you to conveniently provide a long list #[cfg]'d blocks of code
-/// without having to rewrite each clause multiple times.
-macro_rules! cfg_if {
-    // match if/else chains with a final `else`
-    ($(
-        if #[cfg($($meta:meta),*)] { $($it:item)* }
-    ) else * else {
-        $($it2:item)*
-    }) => {
-        cfg_if! {
-            @__items
-            () ;
-            $( ( ($($meta),*) ($($it)*) ), )*
-            ( () ($($it2)*) ),
-        }
-    };
-
-    // match if/else chains lacking a final `else`
-    (
-        if #[cfg($($i_met:meta),*)] { $($i_it:item)* }
-        $(
-            else if #[cfg($($e_met:meta),*)] { $($e_it:item)* }
-        )*
-    ) => {
-        cfg_if! {
-            @__items
-            () ;
-            ( ($($i_met),*) ($($i_it)*) ),
-            $( ( ($($e_met),*) ($($e_it)*) ), )*
-            ( () () ),
-        }
-    };
-
-    // Internal and recursive macro to emit all the items
-    //
-    // Collects all the negated `cfg`s in a list at the beginning and after the
-    // semicolon is all the remaining items
-    (@__items ($($not:meta,)*) ; ) => {};
-    (@__items ($($not:meta,)*) ; ( ($($m:meta),*) ($($it:item)*) ),
-     $($rest:tt)*) => {
-        // Emit all items within one block, applying an appropriate #[cfg]. The
-        // #[cfg] will require all `$m` matchers specified and must also negate
-        // all previous matchers.
-        cfg_if! { @__apply cfg(all($($m,)* not(any($($not),*)))), $($it)* }
-
-        // Recurse to emit all other items in `$rest`, and when we do so add all
-        // our `$m` matchers to the list of `$not` matchers as future emissions
-        // will have to negate everything we just matched as well.
-        cfg_if! { @__items ($($not,)* $($m,)*) ; $($rest)* }
-    };
-
-    // Internal macro to Apply a cfg attribute to a list of items
-    (@__apply $m:meta, $($it:item)*) => {
-        $(#[$m] $it)*
-    };
-}
-
-macro_rules! s {
-    ($($(#[$attr:meta])* pub $t:ident $i:ident { $($field:tt)* })*) => ($(
-        s!(it: $(#[$attr])* pub $t $i { $($field)* });
-    )*);
-    (it: $(#[$attr:meta])* pub union $i:ident { $($field:tt)* }) => (
-        compile_error!("unions cannot derive extra traits, use s_no_extra_traits instead");
-    );
-    (it: $(#[$attr:meta])* pub struct $i:ident { $($field:tt)* }) => (
-        __item! {
-            #[repr(C)]
-            #[cfg_attr(feature = "extra_traits", derive(Debug, Eq, Hash, PartialEq))]
-            #[allow(deprecated)]
-            $(#[$attr])*
-            pub struct $i { $($field)* }
-        }
-        #[allow(deprecated)]
-        impl ::Copy for $i {}
-        #[allow(deprecated)]
-        impl ::Clone for $i {
-            fn clone(&self) -> $i { *self }
-        }
-    );
-}
-
-macro_rules! s_no_extra_traits {
-    ($($(#[$attr:meta])* pub $t:ident $i:ident { $($field:tt)* })*) => ($(
-        s_no_extra_traits!(it: $(#[$attr])* pub $t $i { $($field)* });
-    )*);
-    (it: $(#[$attr:meta])* pub union $i:ident { $($field:tt)* }) => (
-        cfg_if! {
-            if #[cfg(libc_union)] {
-                __item! {
-                    #[repr(C)]
-                    $(#[$attr])*
-                    pub union $i { $($field)* }
-                }
-
-                impl ::Copy for $i {}
-                impl ::Clone for $i {
-                    fn clone(&self) -> $i { *self }
-                }
-            }
-        }
-    );
-    (it: $(#[$attr:meta])* pub struct $i:ident { $($field:tt)* }) => (
-        __item! {
-            #[repr(C)]
-            $(#[$attr])*
-            pub struct $i { $($field)* }
-        }
-        #[allow(deprecated)]
-        impl ::Copy for $i {}
-        #[allow(deprecated)]
-        impl ::Clone for $i {
-            fn clone(&self) -> $i { *self }
-        }
-    );
-}
-
-macro_rules! e {
-    ($($(#[$attr:meta])* pub enum $i:ident { $($field:tt)* })*) => ($(
-        __item! {
-            #[cfg_attr(feature = "extra_traits", derive(Debug, Eq, Hash, PartialEq))]
-            $(#[$attr])*
-            pub enum $i { $($field)* }
-        }
-        impl ::Copy for $i {}
-        impl ::Clone for $i {
-            fn clone(&self) -> $i { *self }
-        }
-    )*);
-}
-
-macro_rules! s_paren {
-    ($($(#[$attr:meta])* pub struct $i:ident ( $($field:tt)* ); )* ) => ($(
-        __item! {
-            #[cfg_attr(feature = "extra_traits", derive(Debug, Eq, Hash, PartialEq))]
-            $(#[$attr])*
-            pub struct $i ( $($field)* );
-        }
-        impl ::Copy for $i {}
-        impl ::Clone for $i {
-            fn clone(&self) -> $i { *self }
-        }
-    )*);
-}
-
-// This is a pretty horrible hack to allow us to conditionally mark
-// some functions as 'const', without requiring users of this macro
-// to care about the "const-extern-fn" feature.
-//
-// When 'const-extern-fn' is enabled, we emit the captured 'const' keyword
-// in the expanded function.
-//
-// When 'const-extern-fn' is disabled, we always emit a plain 'pub unsafe extern fn'.
-// Note that the expression matched by the macro is exactly the same - this allows
-// users of this macro to work whether or not 'const-extern-fn' is enabled
-//
-// Unfortunately, we need to duplicate most of this macro between the 'cfg_if' blocks.
-// This is because 'const unsafe extern fn' won't even parse on older compilers,
-// so we need to avoid emitting it at all of 'const-extern-fn'.
-//
-// Specifically, moving the 'cfg_if' into the macro body will *not* work.
-// Doing so would cause the '#[cfg(feature = "const-extern-fn")]' to be emitted
-// into user code. The 'cfg' gate will not stop Rust from trying to parse the
-// 'pub const unsafe extern fn', so users would get a compiler error even when
-// the 'const-extern-fn' feature is disabled
-//
-// Note that users of this macro need to place 'const' in a weird position
-// (after the closing ')' for the arguments, but before the return type).
-// This was the only way I could satisfy the following two requirements:
-// 1. Avoid ambiguity errors from 'macro_rules!' (which happen when writing '$foo:ident fn'
-// 2. Allow users of this macro to mix 'pub fn foo' and 'pub const fn bar' within the same
-// 'f!' block
-cfg_if! {
-    if #[cfg(libc_const_extern_fn)] {
-        macro_rules! f {
-            ($($(#[$attr:meta])* pub $({$constness:ident})* fn $i:ident(
-                        $($arg:ident: $argty:ty),*
-            ) -> $ret:ty {
-                $($body:stmt);*
-            })*) => ($(
-                #[inline]
-                $(#[$attr])*
-                pub $($constness)* unsafe extern fn $i($($arg: $argty),*
-                ) -> $ret {
-                    $($body);*
-                }
-            )*)
-        }
-
-        macro_rules! safe_f {
-            ($($(#[$attr:meta])* pub $({$constness:ident})* fn $i:ident(
-                        $($arg:ident: $argty:ty),*
-            ) -> $ret:ty {
-                $($body:stmt);*
-            })*) => ($(
-                #[inline]
-                $(#[$attr])*
-                pub $($constness)* extern fn $i($($arg: $argty),*
-                ) -> $ret {
-                    $($body);*
-                }
-            )*)
-        }
-
-        macro_rules! const_fn {
-            ($($(#[$attr:meta])* $({$constness:ident})* fn $i:ident(
-                        $($arg:ident: $argty:ty),*
-            ) -> $ret:ty {
-                $($body:stmt);*
-            })*) => ($(
-                #[inline]
-                $(#[$attr])*
-                $($constness)* fn $i($($arg: $argty),*
-                ) -> $ret {
-                    $($body);*
-                }
-            )*)
-        }
-
-    } else {
-        macro_rules! f {
-            ($($(#[$attr:meta])* pub $({$constness:ident})* fn $i:ident(
-                        $($arg:ident: $argty:ty),*
-            ) -> $ret:ty {
-                $($body:stmt);*
-            })*) => ($(
-                #[inline]
-                $(#[$attr])*
-                pub unsafe extern fn $i($($arg: $argty),*
-                ) -> $ret {
-                    $($body);*
-                }
-            )*)
-        }
-
-        macro_rules! safe_f {
-            ($($(#[$attr:meta])* pub $({$constness:ident})* fn $i:ident(
-                        $($arg:ident: $argty:ty),*
-            ) -> $ret:ty {
-                $($body:stmt);*
-            })*) => ($(
-                #[inline]
-                $(#[$attr])*
-                pub extern fn $i($($arg: $argty),*
-                ) -> $ret {
-                    $($body);*
-                }
-            )*)
-        }
-
-        macro_rules! const_fn {
-            ($($(#[$attr:meta])* $({$constness:ident})* fn $i:ident(
-                        $($arg:ident: $argty:ty),*
-            ) -> $ret:ty {
-                $($body:stmt);*
-            })*) => ($(
-                #[inline]
-                $(#[$attr])*
-                fn $i($($arg: $argty),*
-                ) -> $ret {
-                    $($body);*
-                }
-            )*)
-        }
-    }
-}
-
-macro_rules! __item {
-    ($i:item) => {
-        $i
-    };
-}
-
-macro_rules! align_const {
-    ($($(#[$attr:meta])*
-       pub const $name:ident : $t1:ty
-       = $t2:ident { $($field:tt)* };)*) => ($(
-        #[cfg(libc_align)]
-        $(#[$attr])*
-        pub const $name : $t1 = $t2 {
-            $($field)*
-        };
-        #[cfg(not(libc_align))]
-        $(#[$attr])*
-        pub const $name : $t1 = $t2 {
-            $($field)*
-            __align: [],
-        };
-    )*)
-}
-
-// This macro is used to deprecate items that should be accessed via the mach2 crate
-macro_rules! deprecated_mach {
-    (pub const $id:ident: $ty:ty = $expr:expr;) => {
-        #[deprecated(
-            since = "0.2.55",
-            note = "Use the `mach2` crate instead",
-        )]
-        #[allow(deprecated)]
-        pub const $id: $ty = $expr;
-    };
-    ($(pub const $id:ident: $ty:ty = $expr:expr;)*) => {
-        $(
-            deprecated_mach!(
-                pub const $id: $ty = $expr;
-            );
-        )*
-    };
-    (pub type $id:ident = $ty:ty;) => {
-        #[deprecated(
-            since = "0.2.55",
-            note = "Use the `mach2` crate instead",
-        )]
-        #[allow(deprecated)]
-        pub type $id = $ty;
-    };
-    ($(pub type $id:ident = $ty:ty;)*) => {
-        $(
-            deprecated_mach!(
-                pub type $id = $ty;
-            );
-        )*
-    }
-}
-
-#[cfg(not(libc_ptr_addr_of))]
-macro_rules! ptr_addr_of {
-    ($place:expr) => {
-        &$place
-    };
-}
-
-#[cfg(libc_ptr_addr_of)]
-macro_rules! ptr_addr_of {
-    ($place:expr) => {
-        ::core::ptr::addr_of!($place)
-    };
-}
-

-