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    //! Re-exports either the Rust `std` library or `core` and `alloc` when `std` is
    //! disabled.
    //!
    //! `crate::stdlib::...` should be used rather than `std::` when adding code that
    //! will be available with the standard library disabled.
    //!
    //! Note that this module is called `stdlib` rather than `std`, as Rust 1.34.0
    //! does not permit redefining the name `stdlib` (although this works on the
    //! latest stable Rust).
    #[cfg(feature = "std")]
    pub(crate) use std::*;

    #[cfg(not(feature = "std"))]
    pub(crate) use self::no_std::*;

    #[cfg(not(feature = "std"))]
    mod no_std {
        // We pre-emptively export everything from libcore/liballoc, (even modules
        // we aren't using currently) to make adding new code easier. Therefore,
        // some of these imports will be unused.
        #![allow(unused_imports)]

        pub(crate) use core::{
            any, array, ascii, cell, char, clone, cmp, convert, default, f32, f64, ffi, future, hash,
            hint, i128, i16, i8, isize, iter, marker, mem, num, ops, option, pin, ptr, result, task,
            time, u128, u16, u32, u8, usize,
        };

        pub(crate) use alloc::{boxed, collections, rc, string, vec};

        pub(crate) mod borrow {
            pub(crate) use alloc::borrow::*;
            pub(crate) use core::borrow::*;
        }

        pub(crate) mod fmt {
            pub(crate) use alloc::fmt::*;
            pub(crate) use core::fmt::*;
        }

        pub(crate) mod slice {
            pub(crate) use alloc::slice::*;
            pub(crate) use core::slice::*;
        }

        pub(crate) mod str {
            pub(crate) use alloc::str::*;
            pub(crate) use core::str::*;
        }

        pub(crate) mod sync {
            pub(crate) use alloc::sync::*;
            pub(crate) use core::sync::*;
        }
    }