That can be done with ValueTuples instead of Anonymous Types: `items.Select( i => ( i, frob: Expensive( i.P1 ) ) ).Where( t => t.frob > 3 );` ...and ValueTuple

That can be done with ValueTuples instead of Anonymous Types: `items.Select( i => ( i, frob: Expensive( i.P1 ) ) ).Where( t => t.frob > 3 );` ...and ValueTuples are superior to Anonymous Types because you can actually return them from a function or use them as parameters - whereas Anonymous Types cannot cross method-call boundaries (excepting using generics for pass-through). Anonymous Types in C# were a massive mistake. They should be [Obsolete]'d, IMO.