You are undefining $delim and then trying to use it, perl itself is giving you the 'uninitialized value' warning (see perllexwarn). Try instead: 
delete $delimiters{$delim};

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Update: no that won't throw an exception in this context

In reply to Re: Try::Tiny not returning error by tangent
in thread Try::Tiny not returning error by Audar

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