RunBinaryHandler тип

R RunBinaryHandler(Zone self, ZoneDelegate parent, Zone zone, R f(T1 arg1, T2 arg2), T1 arg1, T2 arg2)

Исходный код

typedef R RunBinaryHandler<R, T1, T2>(Zone self, ZoneDelegate parent, Zone zone,
    R f(T1 arg1, T2 arg2), T1 arg1, T2 arg2);

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https://api.dartlang.org/stable/1.24.3/dart-async/RunBinaryHandler.html