In "Re: Regexp::Common and "multidimensional hash lookup disabled"", I suggested that a patch for Regexp::Common could fix the problem. This was wrong.

The "source for Regexp::Common" starts with (line 3):

use 5.10.0;
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This will use the feature bundle :5.10. See "feature: FEATURE BUNDLES" which includes:

:5.10     bareword_filehandles indirect
          multidimensional say state switch
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So, the multidimensional feature is already loaded.

My test included:

...
package Regexp::Common;
use if $] >= 5.035, feature => 'multidimensional';

package main;
...
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which seemed to fix the problem. However, rewriting that as:

...
package Regexp::Common {
    use if $] >= 5.035, feature => 'multidimensional';
}

package main;
...
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and the problem returns:

Multidimensional hash lookup is disabled at ...
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I'll be striking the incorrect information from the earlier post. It will be in a spoiler; I won't delete it.