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 interface7;

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

interface I
{
}

class C : I
{
}

void main()
{
    I i = new C;
    ClassInfo ci = i.classinfo;
    char[] name = ci.name;
    printf("ci.name = %.*s\n", name.length, name.ptr);
    ClassInfo cI = I.classinfo;
    name = cI.name;
    printf("cI.name = %.*s\n", name.length, name.ptr);
    assert(ci is cI);
}