Concatenate the given Source< TOut, TMat> to this Flow<TIn, 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 Source< TOut, TMat> is materialized together with this Flow and just kept from producing elements by asserting back-pressure until its time comes. If this Flow< TIn, TOut, TMat> gets upstream error - no elements from the given Source< TOut, TMat> will be pulled. @see Concat<TIn, TOut>. 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 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>