This file is indexed.

/usr/lib/mysql-testsuite/include/have_ipv6.inc is in mysql-testsuite-5.6 5.6.16-1~exp1.

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The actual contents of the file can be viewed below.

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# Check if ipv6 is available.
#
--disable_query_log
--disable_result_log
--disable_abort_on_error
connect (checkcon123456789,::1,root,,test);
if($mysql_errno)
{
    skip No IPv6 support;
}
connection default;
if(!$mysql_errno)
{
  disconnect checkcon123456789;
}
--enable_abort_on_error
--enable_result_log
--enable_query_log
# end check