You need to lose the braces around the argument to close because Perl is interpreting that as an anonymous hash (as "use warnings" will tell you).
This works for me:
use strict;
use warnings;
my %files;
open $files{"foo"}, '>', "xyz" or die "open failed: $!";
print { $files{"foo"} } "done\n" or die "print failed: $!";
# close { $files{"foo"} }; # oops: 'Odd number of elements in anony
+mous hash'
close $files{"foo"}; # works ok
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