If defer was used multiple times in one function it was failing to
compile. For example added test is failing like this:

    In file included from golang/runtime/libgolang_test.cpp:22:
    golang/runtime/libgolang_test.cpp: In function ‘void __test_defer(int*)’:
    ./golang/libgolang.h:457:59: error: redeclaration of ‘golang::_deferred _defer___COUNTER__’
     #define defer(f) golang::_deferred _defer_ ## __COUNTER__ (f)
                                                               ^
    golang/runtime/libgolang_test.cpp:473:5: note: in expansion of macro ‘defer’
         defer([&]() {
         ^~~~~
    ./golang/libgolang.h:457:36: note: ‘golang::_deferred _defer___COUNTER__’ previously declared here
     #define defer(f) golang::_deferred _defer_ ## __COUNTER__ (f)
                                        ^~~~~~~
    golang/runtime/libgolang_test.cpp:470:5: note: in expansion of macro ‘defer’
         defer([&]() {
         ^~~~~

It turns out the __COUNTER__ was not expanded and they say you have to
use 3 level of macro calls. Oh well...

https://stackoverflow.com/a/27611869/9456786