Example from http://dlang.org/iasm.html:
---
struct Foo { int a,b,c; }
int bar(Foo *f) {
    asm {
        mov EBX, f;
        mov EAX, Foo.b[EBX];
    }
}
---
main.d(5): Error: variable b cannot be read at compile time

Also see Issue 5302

Workaround: add .offsetof