PHP does this (with a warning). I'm not sure if this should be an argument for or against.
<?php
$foo = array();
echo $foo['a']['b']['c']; // not an error <?php
$foo = array();
echo $foo['a']['b']['c']; // not an error echo $foo['a']['b'] ?? 'default_value'; $v = @first($var1, $var2, 'some-default');
d = lambda {|hash,key| Hash.new(&d) }
foo = Hash.new(&d)
p foo['a']['b']['c']
Of course it's likely to blow up in all kinds of ways since anything trying to do "if foo['a']" to check of 'a' is present in foo will break, for example.