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#!perl -w

...

    warn sprintf "In test, at end (2): TMPDIR '%s'\n",
        ! exists $ENV{TMPDIR} ?  '<absent>' : ! defined $ENV{TMPDIR} ?
+ '<undef>' : $ENV{TMPDIR};

In test, at start (1): TMPDIR '<absent>'
Use of uninitialized value in join or string at test3.pl line 7.
I see args '', 'C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp', 'C:\DOCUME~1\ADMI
+NI~1\LOCALS~1\Temp'
In test, at end (2): TMPDIR '<undef>'

In test, at start (1): TMPDIR '<absent>'
In test, at end (2): TMPDIR '<undef>'