Sorry, I didn't read your post properly. I don't think Try::Tiny handles warnings (just exceptions) but you can catch them: 
sub set_delim {
    undef $delim;
    local $SIG{__WARN__} = sub { die() };
    try {
       ...

[download]
Or you could turn warnings into exceptions: 
sub set_delim {
    undef $delim;
    use warnings 'FATAL' => 'all';
    try {
       ...

[download]

In reply to Re^3: Try::Tiny not returning error by tangent
in thread Try::Tiny not returning error by Audar

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