That's a link to complete changelogs.

Those aren't an "incompatible changes seection".

perldelta covers bugfixes, feature additions etc.

   foreach entry in "https://perldoc.perl.org/perl#History" do
      open entry on browser
      search for "Incompatible Changes" section
      read section contents

Writing a script in Perl to do the above is left as exercise to the reader.

Hint, use LWP.

That's bullshit. I've run exercises from the Orelly CD bookshelf more than a decade old and they just run as is.

Almost all exercises are minimal in nature. They will touch only small areas and (unless the book is based around advanced ideas) will not touch tricky / changing functionality. So I'm not surprised exercises still work.

That just proves the point you got lucky with what language features were used on the exercises.

> That's bullshit.

Dude, there is literally a link with references.