Make "`aa[key]`" use the same runtime call as "`key in aa`". The runtime calls these were using were different, but with equivalent definitions. With `ldc -O3`, the following functions now all compile to the exact same code: {{{ int[int] y; void foo(int x) { if (x in y) { auto z = x in y; sink(*z); } } void bar(int x) { if (x in y) { sink(y[x]); } } void baz(int x) { if (auto p = x in y) { sink(*p); } } }}}

module interface2;

extern(C) int printf(char*,...);

interface A
{
    void a();
}

interface B
{
    void b();
}

class C : A,B
{
    int i = 0;
    override void a()
    {
        printf("hello from C.a\n");
    }
    override void b()
    {
        printf("hello from C.b\n");
    }
}

void main()
{
    scope c = new C;
    {c.a();
    c.b();}
    {A a = c;
    a.a();}
    {B b = c;
    b.b();}
}