class A ['a] where 'a : System.IComparable ['a], System.IComparable ['a] { // E: constraint `System.IComparable.*' is already declared for 'a
}

namespace Bug1048 {
using System;

class RefTypeA {}
class RefTypeB {}

struct StructType {}

class Test1[T1] where T1 : Object, Int32 {} // E: generic parameter cannot be constrained by multiple non-interfaces : int, System.Object
class Test2[T1] where T1 : Object, StructType {} // E: generic parameter cannot be constrained by multiple non-interfaces : Bug1048.StructType, System.Object
class Test3[T1] where T1 : RefTypeA, RefTypeB {} // E: generic parameter cannot be constrained by multiple non-interfaces : Bug1048.RefTypeB, Bug1048.RefTypeA
}