That was not a valid example:
$ perl -c /tmp/test.pl
Missing right curly or square bracket at /tmp/test.pl line 1, at end of
line
syntax error at /tmp/test.pl line 1, at EOF
/tmp/test.pl had compilation errors.
$ cat /tmp/test.pl
!@77 {{} #!@3 = ++ 90 x (%}[.