Has.Attribute error

[Rechenelf]

NUnit 2.5.10 with gui

The following line does not work:
Assert.That(GetType(), Has.Attribute<Attr1>() | Has.Attribute<Attr2>());

Compiler gives an error like "cannot use operator | with two ResolvableConstraintExpressions".
Would be nice if this will compile in future.

But this works:
Assert.That(GetType(), Has.Attribute<Attr1>().Or.Attribute<Attr2>());

[Rechenelf (matklaus)]

After thinking about once again, I wundering why | (bitwise or) is used instead of || (boolean or).
Should not be the operator|| be overloaded instead of operator|?
Similar && instead of &.

[Charlie Poole (charlie.poole)]

The design of NUnit requires the operator to return a constraint object, combining the two constraints. This is not possible using logical or, since || cannot be overridden. It's possible to simulate an override of operator ||, by specifying an implicit conversion of the constraint to boolean, but that would give a boolean result rather than a constraint. We need a constraint because the constraint object knows how to provide an error message.

[Charlie Poole (charlie.poole)]

Also applies to operator & and operator ! overrides. For the binary operators, it also needed combinations of Constraint and ResolvableConstraintExpression in both orders.