The information in nextstate is used by the debugger to display the current line while stepping thru

• hence it has to be the start of the statement,
• hence the line with the sub statement in our case
• not the "function name", since it could be in another line

Sorry, I don't think there is any room left to argue.

edit

The debugger can't work properly with this bug, and actually fails.

If you type v you'll see something like

  DB<1> n
main::tst(caller_subline.pl:24):                               do { A 
+=> 1, B =>
main::tst(caller_subline.pl:25):                             );

  DB<1> v
21
22
23         print_calling_line( __LINE__,
24==>                          do { A => 1, B => 2, C => 3 }
25                           );
26
27         print_calling_line( __LINE__,
28:                            do { A => 1, B => 2, C => 3 },
29:                            do { A => 1, B => 2, C => 3 ,
30:                                   do { A => 1, B => 2, C => 3 }

  DB<1> n
Called from line 23; caller() reports line 24
main::tst(caller_subline.pl:29):                               do { A 
+=> 1, B =>
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