warn "# $_" while <$out>;
warn "# $_" while <$err>;

##</code><code>##

ok 1 - compiling ptr_cast_test.c
not ok 2 - STDERR empty after compiling
#   Failed test 'STDERR empty after compiling'
#   at t/local/00_ptr_cast.t line 30.
#          got: undef
#     expected: ''
ok 3 - ./ptr_cast_test exited with 0
ok 4 - casting pointer integer and back worked
ok 5 - STDERR empty after running
# Looks like you failed 1 test of 5.