Generic IEnumerable missintepreted

[waclaw66]

The last test fails with
Expression of type 'System.Collections.Generic.IEnumerable`1[T]' cannot be used for parameter of type 'System.Collections.Generic.IEnumerable`1[System.Object]' of method 'Boolean Any[Object](System.Collections.Generic.IEnumerable`1[System.Object])'

public class Utils
{
    public static bool Any<T>(IEnumerable<T> collection)
    {
        return false;
    }

    public static bool Any(IEnumerable collection)
    {
        return false;
    }
}

var target = new Interpreter();
target.Reference(typeof(Utils));
target.Reference(typeof(IEnumerable<>));

Assert.DoesNotThrow(() => Utils.Any((IEnumerable<object>)null));
Assert.DoesNotThrow(() => Utils.Any(null));
Assert.DoesNotThrow(() => target.Eval("Utils.Any(list)", new Parameter("list", typeof(IEnumerable<object>), null)));
Assert.DoesNotThrow(() => target.Eval("Utils.Any(null)"));

[metoule]

After PR #210, there's a different exception:

System.ArgumentException : Type System.Collections.Generic.IEnumerable`1[T] contains generic parameters (Parameter 'type')
  TypeUtils.ValidateType(Type type, String paramName, Int32 index)
  TypeUtils.ValidateType(Type type, String paramName, Boolean allowByRef, Boolean allowPointer)
  Expression.Constant(Object value, Type type)
  Parser.PromoteExpression(Expression expr, Type type, Boolean exact) line 2182