1# RUN: cp %s %t && not %update_test_body %t 2>&1 | FileCheck %s 2# RUN: diff -u %t %s 3 4# CHECK: stdout is empty; forgot -o - ? 5 6.ifdef GEN 7#--- a.txt 8.long 0 9#--- b.txt 10.long 1 11#--- gen 12true 13.endif 14