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mod sealed {
    pub trait Sealed {}

}

use self::sealed::Sealed;

/// A trait used to cause a compile-time error mentioning the types constrained by it.
///
/// This trait is usable when there are generic parameters,
/// to give the user an error message telling them why an impl is not usable.
///
/// This trait is unimplementable.
///
pub trait TypePanic: Sealed {}