Automatic invariant generation

[Nicholas Wilson via Digitalmars-d]

The compiler seems to inset an `assert(this !is null, "null 
this");` into my struct.
which is for all intents and purposes.
struct Foo {
     Bar b;
}

struct Bar {
     void* ptr;
}

I tried disabling the invariant but it complained that invariant 
requires a function body.
Is there a way to disable the implicit generations of invariants 
for my code other than -release? Like for a particular subset of 
files (separate invocations of the compiler is not an acceptable 
approach.

The reason being that I do not support global variables (of any 
kind) at the moment in dcompute and the insertion of the string 
literal to the assert breaks that.