# no #include needed to get fields --------------------------------------------
tcc -c -Wnounused
$foo = ip_hdr;
EOF
# tcc -n disables default.tc inclusion ----------------------------------------
tcc -c -n 2>&1
$foo = ip_hdr;
EOF
ERROR
<stdin>:1: syntax error near "ip_hdr"
# of course, we can #include fields.tc explicitly (-n) ------------------------
tcc -c -n -Wnounused
#include "fields.tc"

$foo = ip_hdr;
EOF
# of course, we can #include fields.tc explicitly (no -n) ---------------------
tcc -c -Wnounused
#include "fields.tc"

$foo = ip_hdr;
EOF
