Expression interpreter - IsTrue, IsFalse, UnaryPlus missing cases

[bartdesmet]

Evaluating the following expressions results in NotSupportedException, where it doesn't for the compiler. It seems there's the wrong assumption those node types are always used in conjunction with a method, but that's not the case for primitive types:

Test(Expression.IsTrue(Expression.Constant(true)));
Test(Expression.IsFalse(Expression.Constant(true)));
Test(Expression.UnaryPlus(Expression.Constant(42)));

where Test is a simple wrapper around Expression.Lambda<Func>(e).Compile()()

[VSadov]

closed in dotnet/corefx#3227