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#!/usr/bin/perl
use strict;
...
print 3+$x;

print "done\n";

Use of uninitialized value $name in concatenation (.) or string at t/f
+iles/hello_with_warn.pl line 7
Argument "2x" isn't numeric in addition (+) at t/files/hello_with_warn
+.pl line 9.

#!/usr/bin/perl
use warnings;

$what = 42;

Name "main::what" used only once: possible typo at t/files/no_strict.p
+l line 4.

#!/usr/bin/perl
use strict;
...
if ($x) {
    print "ok";
}

Global symbol "$x" requires explicit package name at t/files/missing_s
+emicolon.pl line 7.
syntax error at t/files/missing_semicolon.pl line 7, near ") {"
Execution of t/files/missing_semicolon.pl aborted due to compilation e
+rrors.