# fromif accepts quoted string ------------------------------------------------
tcc -c
prio {
    class on route element(fromif "eth0");
}
EOF
# fromif no longer accepts bare word ------------------------------------------
tcc -c 2>&1
prio {
    class on route element(fromif eth0);
}
EOF
ERROR
<stdin>:2: syntax error near "eth0"
# fromif doesn't accept non-string --------------------------------------------
tcc -c 2>&1
prio {
    class on route element(fromif 42);
}
EOF
ERROR
<stdin>:2: invalid type conversion (expected string instead of integer) near ")"
# fromif accepts string expression --------------------------------------------
tcc -c
prio {
    class on route element(fromif "eth"+"0");
}
EOF
