Concatenate the given SourceTOut, TMat to this FlowTIn, TOut, TMat, 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 SourceTOut, TMat is materialized together with this Flow and just kept from producing elements by asserting back-pressure until its time comes. If this FlowTIn, TOut, TMat gets upstream error - no elements from the given SourceTOut, TMat will be pulled. @see ConcatTIn, TOut. It is recommended to use the internally optimized LeftTLeft, TRight(TLeft, TRight) and RightTLeft, TRight(TLeft, TRight) combiners where appropriate instead of manually writing functions that pass through one of the values.

public Source<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> -> Source<'TOut, 'TMat3>