"<var>X</var>" не в состоянии реализовать как "<var>Y</var>", так и "<var>Z</var>", поскольку они могут быть идентичными для некоторых подстановок параметров-типов

Message in Russian (Русский)

Unlocalized message

'<var>X</var>' cannot implement both '<var>Y</var>' and '<var>Z</var>' because they may unify for some type parameter substitutions

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