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```
if ($foo){...}
```

if ($myHash{"unknown_if_this_key_exists_yet_or_not"}){...}

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if ($myHash{unknown}{if}{this}{key}{combination}{exists}{yet}{or}{not}
+){...}

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my %myHash = ();
if ($myHash{unknown}{if}{this}{key}{combination}{exists}{yet}{or}{not}
+){print "Nothing prints here; Good!"}
if ($myHash{unknown}{if}{this}{key}{combination}{exists}{yet}{or}     
+){print "This will print, although we'd like it not to...";}

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if (exists($myHash{unknown}{if}{this}{key}{combination}{exists}{yet}{o
+r}{not}) and $myHash{unknown}{if}{this}{key}{combination}{exists}{yet
+}{or}{not}){...}

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if ($myHash{"this_key_does_not_exist"){...}

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Readonly::Hash $myHash => ("key1" = "val1",); 
$myTempValue = $myHash{"this_key_does_not_exist"};

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no autovivification;
my %myHash = ();
if ($myHash{unknown}{if}{this}{key}{combination}{exists}{yet}{or}{not}
+){print "Nothing prints here; Good!"}
if ($myHash{unknown}{if}{this}{key}{combination}{exists}{yet}{or}     
+){print "This will NOT print! That is exactly what we want!";}

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cpan
> notest install autovivification
> q