Concatenate the given to this , meaning that once this Flow’s input is exhausted and all result elements have been generated, the Source’s elements will be produced. Note that the is materialized together with this Flow and just kept from producing elements by asserting back-pressure until its time comes. If this gets upstream error - no elements from the given will be pulled. @see . It is recommended to use the internally optimized Left< TLeft, TRight> (TLeft, TRight) and Right< TLeft, TRight> (TLeft, TRight) combiners where appropriate instead of manually writing functions that pass through one of the values.

public Flow<TIn, TOut, TMat3> ConcatMaterialized<TMat2, TMat3>(
	IGraph<SourceShape<TOut>, TMat2> that,
	Func<TMat, TMat2, TMat3> materializedFunction
)

member ConcatMaterialized : 
        that : IGraph<SourceShape<'TOut>, 'TMat2> * 
        materializedFunction : Func<'TMat, 'TMat2, 'TMat3> -> Flow<'TIn, 'TOut, 'TMat3>