Comment 1 by Ziyu4Huang:

You can print address of array pointer, isn't it ?
  var a = [...]int {1, 2, 3};
  fmt.Printf("pointer %p\n", &a);
maps, slice, channel are all reference type, why do you want a reference's address?
Only data that reference point to has meaning, like.
  var b = a[0:];
  fmt.Printf("pointer %p\n", &b[0]);

Comment 2:

being able to print the address of a mutable data structure is very useful for debugging 
- there's no other easy way to verify that two pieces of code are talking to the same 
thing. currently, %v will print the address of a channel, but there's no way to do the 
same with the others, except with the builtin function print, which only works to stdout.

Comment 3:

Status changed to Accepted.

Comment 4:

Owner changed to r...@golang.org.

Comment 5:

Labels changed: added packagechange.

Comment 6:

This issue was closed by revision 2e853ec.

Status changed to Fixed.

Merged into issue #-.