print map{ print wantarray(); (1,2,3) } 1;;
Use of uninitialized value in print at (eval 19) line 1, <STDIN> line 11.

1 2 3

##</code><code>##

print scalar map{ print wantarray(); (1,2,3) } 1;;
Use of uninitialized value in print at (eval 20) line 1, <STDIN> line 12.

3

##</code><code>##

print do{ print wantarray(); (1,2,3) };;
Use of uninitialized value in print at (eval 23) line 1, <STDIN> line 15.

1 2 3