UASM_LABEL_INVALID
for (; rel->lab != UASM_LABEL_INVALID; rel++)
for (l = lab; l->lab != UASM_LABEL_INVALID; l++)
for (; rel->lab != UASM_LABEL_INVALID; rel++)
for (; lab->lab != UASM_LABEL_INVALID; lab++)
for (; rel->lab != UASM_LABEL_INVALID; rel++) {