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sub block(&) {
    return undef;
}

print block {'whatever'} || "is undef";
  2. or download this
    sub block(&) {
    return undef;
...
Too many arguments for main::block at bug.pl line 6, near "// "is unde
+f""
syntax error at bug.pl line 6, near "// "is undef""
Execution of bug.pl aborted due to compilation errors.