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    //! The `is_{target_arch}_feature_detected!` macro are only available on their
    //! architecture. These macros provide a better error messages when the user
    //! attempts to call them in a different architecture.

    #[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))]
    #[macro_export]
    #[unstable(feature = "stdsimd", issue = "27731")]
    macro_rules! is_x86_feature_detected {
        ($t: tt) => {
            compile_error!(
                r#"
            is_x86_feature_detected can only be used on x86 and x86_64 targets.
            You can prevent it from being used in other architectures by
            guarding it behind a cfg(target_arch) as follows:

                #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
                    if is_x86_feature_detected(...) { ... }
                }
            "#
            )
        };
    }

    #[cfg(not(target_arch = "arm"))]
    #[macro_export]
    #[unstable(feature = "stdsimd", issue = "27731")]
    macro_rules! is_arm_feature_detected {
        ($t:tt) => {
            compile_error!(
                r#"
            is_arm_feature_detected can only be used on ARM targets.
            You can prevent it from being used in other architectures by
            guarding it behind a cfg(target_arch) as follows:

                #[cfg(target_arch = "arm")] {
                    if is_arm_feature_detected(...) { ... }
                }
            "#
            )
        };
    }

    #[cfg(not(target_arch = "aarch64"))]
    #[macro_export]
    #[unstable(feature = "stdsimd", issue = "27731")]
    macro_rules! is_aarch64_feature_detected {
        ($t: tt) => {
            compile_error!(
                r#"
            is_aarch64_feature_detected can only be used on AArch64 targets.
            You can prevent it from being used in other architectures by
            guarding it behind a cfg(target_arch) as follows:

                #[cfg(target_arch = "aarch64")] {
                    if is_aarch64_feature_detected(...) { ... }
                }
            "#
            )
        };
    }

    #[cfg(not(target_arch = "powerpc"))]
    #[macro_export]
    #[unstable(feature = "stdsimd", issue = "27731")]
    macro_rules! is_powerpc_feature_detected {
        ($t:tt) => {
            compile_error!(
                r#"
    is_powerpc_feature_detected can only be used on PowerPC targets.
    You can prevent it from being used in other architectures by
    guarding it behind a cfg(target_arch) as follows:

        #[cfg(target_arch = "powerpc")] {
            if is_powerpc_feature_detected(...) { ... }
        }
    "#
            )
        };
    }

    #[cfg(not(target_arch = "powerpc64"))]
    #[macro_export]
    #[unstable(feature = "stdsimd", issue = "27731")]
    macro_rules! is_powerpc64_feature_detected {
        ($t:tt) => {
            compile_error!(
                r#"
    is_powerpc64_feature_detected can only be used on PowerPC64 targets.
    You can prevent it from being used in other architectures by
    guarding it behind a cfg(target_arch) as follows:

        #[cfg(target_arch = "powerpc64")] {
            if is_powerpc64_feature_detected(...) { ... }
        }
    "#
            )
        };
    }

    #[cfg(not(target_arch = "mips"))]
    #[macro_export]
    #[unstable(feature = "stdsimd", issue = "27731")]
    macro_rules! is_mips_feature_detected {
        ($t:tt) => {
            compile_error!(
                r#"
            is_mips_feature_detected can only be used on MIPS targets.
            You can prevent it from being used in other architectures by
            guarding it behind a cfg(target_arch) as follows:

                #[cfg(target_arch = "mips")] {
                    if is_mips_feature_detected(...) { ... }
                }
            "#
            )
        };
    }

    #[cfg(not(target_arch = "mips64"))]
    #[macro_export]
    #[unstable(feature = "stdsimd", issue = "27731")]
    macro_rules! is_mips64_feature_detected {
        ($t:tt) => {
            compile_error!(
                r#"
            is_mips64_feature_detected can only be used on MIPS64 targets.
            You can prevent it from being used in other architectures by
            guarding it behind a cfg(target_arch) as follows:

                #[cfg(target_arch = "mips64")] {
                    if is_mips64_feature_detected(...) { ... }
                }
            "#
            )
        };
    }

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