bash -c printf "fn main() {\n    let sep: String = \"\037\"\n    println(el_str_concat(\"a\", el_str_concat(sep, \"b\")))\n}\n" > /tmp/ctrl.el; echo "--- source bytes (note the raw 037 = 0x1F) ---"; od -c /tmp/ctrl.el | sed -n "2,3p"; echo "--- emitted run 1 ---"; /tmp/elcxc /tmp/ctrl.el 2>/dev/null | grep -n "el_val_t sep"; echo "--- emitted run 2 ---"; /tmp/elcxc /tmp/ctrl.el 2>/dev/null | grep -n "el_val_t sep"; echo "--- emitted run 3 ---"; /tmp/elcxc /tmp/ctrl.el 2>/dev/null | grep -n "el_val_t sep"