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(W parenthesis)
...
(W uninitialized)

Global symbol "$tring" requires explicit package name (did you forget 
+to declare "my $tring"?) at ...
Execution of ... aborted due to compilation errors (#1)
...
Uncaught exception from user code:
    Global symbol "$tring" requires explicit package name (did you for
+get to declare "my $tring"?) at ...
    Execution of ... aborted due to compilation errors.

$ perl -MO=Deparse -e 'index my $tring,$art'
index my $tring, $art;
-e syntax OK