in perl -V
...
...
@INC:
    /usr/lib/perl5/site_perl
    /usr/share/perl5/site_perl
    /usr/lib/perl5/vendor_perl
    /usr/share/perl5/vendor_perl
    /usr/lib/perl5/core_perl
    /usr/share/perl5/core_perl



and

yaourt -S perl-moose

...
...
t/type_constraints/util_type_constraints_export.t       (Wstat: 512 Tests: 0 Failed: 0)
  Non-zero exit status: 2
  Parse errors: No plan found in TAP output
t/type_constraints/util_type_reloading.t                (Wstat: 1024 Tests: 4 Failed: 4)
  Failed tests:  1-4
  Non-zero exit status: 4
Files=387, Tests=53, 35 wallclock secs ( 1.37 usr  0.65 sys + 27.80 cusr  3.91 csys = 33.73 CPU)
Result: FAIL
Failed 353/387 test programs. 19/53 subtests failed.
make: *** [test_dynamic] Error 4
==> ERROR: A failure occurred in check().
    Aborting...
==> ERROR: Makepkg was unable to build perl-moose.
==> Restart building perl-moose ? [y/N]