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$ perl -v | head -2 | tail -1
This is perl 5, version 24, subversion 0 (v5.24.0) built for darwin-th
+read-multi-2level

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#!/usr/bin/env perl -l

...

print $x->@*;
print "$x->@*";

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```
teststring
ARRAY(0x7fc63c005498)->@*
```
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```
use 5.024;
```
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```
use feature qw{postderef_qq};
```
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```
teststring
test string
```

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$ perl -v | head -2 | tail -1
This is perl 5, version 20, subversion 0 (v5.20.0) built for darwin-th
+read-multi-2level

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Array found where operator expected at ./pm_1174734_postderef.pl line 
+11, at end of line
    (Missing operator before ?)
syntax error at ./pm_1174734_postderef.pl line 11, near "->@*"
Execution of ./pm_1174734_postderef.pl aborted due to compilation erro
+rs.

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use warnings;
no warnings qw{experimental::postderef};
use feature qw{postderef postderef_qq};

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```
teststring
test string
```

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Perl v5.20.0 required--this is only v5.18.0, stopped at ...
BEGIN failed--compilation aborted at ...

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Unknown warnings category 'experimental::postderef' at ...
BEGIN failed--compilation aborted at ...