src/Shared/EntityFramework/Core/Common/Utils/Set.cs
// <summary>
// Requires: other collection must not be null.
// Unions other set with this set, returning the result.
// </summary>
other collection must not be null.
Unions other set with this set, returning the result.
other collection must not be null . Unions other set with this set returning the result .
internal Set<TElement> Union(IEnumerable<TElement> other)
        {
            var copy = new Set<TElement>(this);
            copy.Unite(other);
            return copy;
        }
internal Set < TElement > Union ( IEnumerable < TElement > other ) { var copy = new Set < TElement > ( this ) ; copy . Unite ( other ) ; return copy ; }
Requires: other collection must not be null.
Requires : other collection must not be null .
other
IEnumerable<TElement>