So, what you are saying is that the advice to "build a comprehensive test suite" and then use a manual, step-by-step "rename a sub at random and run the test suite to see what happens" advice will, after all the laborious and manually intensive effort involved, miss the very same example that your pointed out that my fast and mostly automated method would miss: 

C:\test>type junk8.pl
#! perl -slw
use strict;

foo() if @ARGV;

C:\test>perl -MDevel::Cover junk8.pl
Devel::Cover 0.61: Collecting coverage data for branch, condition, pod
+, statement, subroutine and time.
Selecting packages matching:
Ignoring packages matching:
    /Devel/Cover[./]
Ignoring packages in:
    .
    c:/Perl/lib
    c:/Perl/site/lib

Devel::Cover: Can't find file "blib\lib\Storable.pm" (blib\lib\Storabl
+e.pm (autosplit into blib\lib\auto\Storable\retrieve.al)): ignored.
Devel::Cover: Writing coverage database to C:/test/cover_db/runs/11934
+13458.532.60512

---------------------------- ------ ------ ------ ------ ------ ------
+ ------
File                           stmt   bran   cond    sub    pod   time
+  total
---------------------------- ------ ------ ------ ------ ------ ------
+ ------
junk8.pl                      100.0   50.0    n/a  100.0    n/a  100.0
+   85.7
Total                         100.0   50.0    n/a  100.0    n/a  100.0
+   85.7
---------------------------- ------ ------ ------ ------ ------ ------
+ ------

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Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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In reply to Re^9: Cleaning up unused subroutines by BrowserUk
in thread Cleaning up unused subroutines by koknat

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