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 b;

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

struct S
{
    int i;
    float[4] f;
}

void main()
{
    S s;
    int i = s.i;
    int* p = &s.i;
    *p = 42;
    printf("%d == %d\n", *p, s.i);

    float* f = &s.f[0];
    printf("%f == %f\n", *f, s.f[0]);
    *f = 3.1415;
    printf("%f == %f\n", *f, s.f[0]);
    s.f[0] = 123.456;
    printf("%f == %f\n", *f, s.f[0]);
}