/usr/share/go/test/goprint.out is in golang-src 2:1.2.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
42 true false true +1.500000e+000 world 0x0 [0/0]0x0 0x0 0x0 255