Redefined error message (perl 5.42.0) with your example code

[nigelhorne]

$ perl
use DateTime::TimeZone::local;
Subroutine TimeZone redefined at /Users/njh/perl5/perlbrew/perls/perl-5.42.0/lib/site_perl/5.42.0/DateTime/TimeZone/local.pm line 14.
Subroutine _load_subclass redefined at /Users/njh/perl5/perlbrew/perls/perl-5.42.0/lib/site_perl/5.42.0/DateTime/TimeZone/local.pm line 45.
Subroutine FromEnv redefined at /Users/njh/perl5/perlbrew/perls/perl-5.42.0/lib/site_perl/5.42.0/DateTime/TimeZone/local.pm line 67.
Subroutine _IsValidName redefined at /Users/njh/perl5/perlbrew/perls/perl-5.42.0/lib/site_perl/5.42.0/DateTime/TimeZone/local.pm line 85.
print DateTime::TimeZone::local->TimeZone();
Can't locate object method "TimeZone" via package "DateTime::TimeZone::local" (perhaps you forgot to load "DateTime::TimeZone::local"?) at - line 2.

[autarch]

The package name uses Local with a capital "L". But the primary intended use of the local time zone is to write DateTime::TimeZone->new( name => 'local' ), not to use the Local package directly (though you can if you really want to).