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    static char* valid_keys[] = {
        "callbacks", "can", "default", "depends", "isa", "optional", "
+regex", "type"
...
            FAIL(buffer, options);
        }
    }

$ ./841578.pl
1..4
...
 at ./841578.pl line 14
        main::howareyoufeelingtoday('happy') called at ./841578.pl lin
+e 18
# Looks like your test exited with 9 before it could output anything.