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  1. #!/usr/bin/perl
  2. use strict;
  3. use warnings;
  4.  
  5. if (1) {
  6. my $a = 1;
  7. }
  8. print $a;
  9.  
Success #stdin #stdout #stderr 0s 3696KB
stdin
Standard input is empty
stdout
Standard output is empty
stderr
Name "main::a" used only once: possible typo at prog.pl line 8.
Use of uninitialized value $a in print at prog.pl line 8.