Another oddity: the problematic behavior seems to be associated with assignment to a freshly declared lexical:

c:\@Work\Perl\monks>perl -le
"use warnings;
 use strict;
 ;;
 use Test::More 'no_plan';
 use Test::NoWarnings;
 ;;
 note 'perl version: ', $];
 ;;
 @_ = qw(a b c d e f g);
 ;;
 note 'assign to a fresh lexical';
 ;;
 my @ra = (shift @_)[ 0, 0, 0 ];
 is_deeply \@ra, [ 'a', 'a', 'a' ], '1st = (shift)[slice] to my @ra';
 ;;
 @ra = (shift @_)[ 0, 0, 0 ];
 is_deeply \@ra, [ 'b', 'b', 'b' ], '2nd = (shift)[slice] to @ra';
 ;;
 note 'now another lexical';
 ;;
 my @rb = (shift @_)[ 0, 0, 0 ];
 is_deeply \@rb, [ 'c', 'c', 'c' ], '1st = (shift)[slice] to my @rb';
 ;;
 @rb = (shift @_)[ 0, 0, 0 ];
 is_deeply \@rb, [ 'd', 'd', 'd' ], '2nd = (shift)[slice] to @rb';
 ;;
 @rb = (shift @_)[ 0, 0, 0 ];
 is_deeply \@rb, [ 'e', 'e', 'e' ], '3rd = (shift)[slice] to @rb';
 ;;
 done_testing;
"
# perl version: 5.014004
# assign to a fresh lexical
not ok 1 - 1st = (shift)[slice] to my @ra
#   Failed test '1st = (shift)[slice] to my @ra'
#   at -e line 1.
#     Structures begin differing at:
#          $got->[1] = undef
#     $expected->[1] = 'a'
ok 2 - 2nd = (shift)[slice] to @ra
# now another lexical
not ok 3 - 1st = (shift)[slice] to my @rb
#   Failed test '1st = (shift)[slice] to my @rb'
#   at -e line 1.
#     Structures begin differing at:
#          $got->[1] = undef
#     $expected->[1] = 'c'
ok 4 - 2nd = (shift)[slice] to @rb
ok 5 - 3rd = (shift)[slice] to @rb
1..5
ok 6 - no warnings
1..6
# Looks like you failed 2 tests of 6.
[download]

(These tests all pass for all other versions I have in captivity; see update to this reply.)

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