dmd/compiler/test/fail_compilation/fail2740.d

/*
TEST_OUTPUT:
---
fail_compilation/fail2740.d(17): Error: class `fail2740.Foo` ambiguous virtual function `foo`
---
*/
interface IFoo
{
	int foo();
}

mixin template MFoo(int N)
{
	int foo() { return N; }
}

class Foo : IFoo
{
	mixin MFoo!(1) t1;
	mixin MFoo!(2) t2;
}