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    use strict;
use warnings;
...
tst $h{$bla};  # line 16
undef $bla;
tst $h{$bla};  # line 19
  2. or download this
    entering tst()
leaving tst()
...
entering tst()
Use of uninitialized value in scalar assignment at perlmonks-1063097.p
+l line 6.
leaving tst()