How does the C# garbage collector find objects whose only reference is an interior pointer?

Question

In C#, ref and out params are, as far as I know, passed by passing only the raw address of the relevant value. That address may be an interior poin

Answer 1

Your code compiles to

    IL_0001: newobj instance void Foo::.ctor()
    IL_0006: ldflda int32 Foo::'field'
    IL_000b: call void Foo::Increment(int32&)

AFAIK, the ldflda instruction creates a reference to the object containing the field, for as long as the address is on the stack (until the call completes).