RFC: moving forward with @nogc Phobos

[Foo via Digitalmars-d]

I hate the fact that this will produce template bloat for each 
function/method.
I'm also in favor of "let the user pick", but I would use a 
global variable:

----
enum MemoryManagementPolicy { gc, rc, mrc }
immutable
     gc = ResourceManagementPolicy.gc,
     rc = ResourceManagementPolicy.rc,
     mrc = ResourceManagementPolicy.mrc;

auto RMP = gc;
----

and in my code:

----
RMP = rc;
string str = "foo"; // compiler knows -> ref counted
// ...
RMP = gc;
string str2 = "bar"; // normal behaviour restored
----