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use strict;
use warnings;
...
splice_insert(@a);

print "@a   # after subroutine\n";

0 1 2 3 4 5 6   # before subroutine
0 1 a b c 4 5 6 # after splice
. . . . . . . . # after for loop
. . 2 3 . . .   # after subroutine