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use strict;
use warnings;
...
print bar () . "\n";

sub bar {return 'bar';}

Unquoted string "bar" may clash with future reserved word at noname.pl
+ line 8.
foo
Use of uninitialized value in concatenation (.) or string at noname.pl
+ line 8.
print() on unopened filehandle bar at noname.pl line 8.