This file is indexed.

/usr/share/systemtap/runtime/autoconf-stacktrace_ops-warning.c is in systemtap-common 1.6-1ubuntu1.

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The actual contents of the file can be viewed below.

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/* Some kernels have warning fields in stacktrace_ops. */
#include <linux/sched.h>
#include <asm/stacktrace.h>

void foo (void)
{
  struct stacktrace_ops t;
  t.warning = 0;
  (void) t;
}