meaning autotest exit code 13

[djien]

I generate test.at to a testsuite script using autom4te (v.2.68) and execute
this test. It fails with a return code 13.
Please inform me whether there is a list of return-codes which explains this
error code.

Test is simple: it compares output Hello, world

Thank you for your effort


t.at
#AT_PACKAGE_STRING 
#AT_PACKAGE_BUGREPORT
m4_define([AT_PACKAGE_STRING],    [hello])
m4_define([AT_PACKAGE_BUGREPORT], address@hidden)
AT_INIT([hello])
AT_SETUP([hello])
AT_TESTED(hello)
AT_CHECK([hello],['Hello, world'])
AT_CLEANUP

t.log
## ---------------------- ##
## Detailed failed tests. ##
## ---------------------- ##

#                             -*- compilation -*-
1. testsuite.at:6: testing hello ...
++ set +x
/testsuite.at:8: hello
++ hello
--- /dev/null   2013-03-05 22:33:26.850202646 +0100
+++
/media/wd40/TODOs/work/work_20130306/4a_autotest/t.dir/at-groups/1/stdout
2013-03-06 09:36:49.099438123 +0100
@@ -0,0 +1 @@
+Hello, world
/testsuite.at:8: exit code was 13, expected Hello, world
1. testsuite.at:6: 1. hello (testsuite.at:6): FAILED (testsuite.at:8)



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