There are a few other extensions that should be supported. Plan9-style C also
supports accessing anonymous structure and union members by type name iff they
are declared using a typedef name. For example, `p.Point` in:
```
typedef struct Point
{
int x, y;
} Point;
struct
{
int type;
Point;
} p;
void take(Point* point);
```
It also supports using the address of the parent struct without a cast anywhere
that the address of the anonymous member is used, as in `take(p)`. The compiler
should automatically promote the type, adjust the address, and suppress the
otherwise germane `[-Wincompatible-pointer-types]` warning.
I'm not sure whether these two extensions are leveraged in the Go 1.3 compiler,
but they are frequently used in Plan 9 itself, and are necessary for compiling
it.
http://reviews.llvm.org/D3853
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