our @x;
sub foo {
  print "wantarray? ", wantarray?1:0, "\n";
  push @x, (1,2,3);
  return @x;
}
pop foo();

##</code><code>##

Type of arg 1 to pop must be array (not subroutine entry) at Monks/Snippet.pm line 7, near ");"
Execution of Monks/Snippet.pm aborted due to compilation errors.

##</code><code>##

Type of arg 1 to push must be array (not subroutine entry) at Monks/Snippet.pm line 7, near "4;"
Execution of Monks/Snippet.pm aborted due to compilation errors.