[Bug gdb/31463] New: Artificial variables in locals output

["dmitry.neverov at jetbrains dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31463

            Bug ID: 31463
           Summary: Artificial variables in locals output
           Product: gdb
           Version: 14.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: dmitry.neverov at jetbrains dot com
  Target Milestone: ---

To reproduce compile the program (g++ -g -o main main.cpp):

#include <iostream>
#include <vector>

int main() {
  std::vector<int> v = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
  for (auto i : v) {
    std::cout << i << std::endl;
  }
  return 0;
}

Run gdb: 

$ gdb -q -batch main -ex "b main.cpp:7" -ex "run" -ex "info locals"

The output contains artificial symbols __for_range, __for_begin, __for_end:

Breakpoint 1, main () at main.cpp:7
7           std::cout << i << std::endl;
i = 1
__for_range = std::vector of length 10, capacity 10 = {1, 2, 3, 4, 5, 6, 7, 8,
9, 10}
__for_begin = 1
__for_end = 60721
v = std::vector of length 10, capacity 10 = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

These symbols also returned when iterating over a block
in python, and is_artificial is not exposed in python API.

This was fixed for Ada, but not other languages in
https://sourceware.org/bugzilla/show_bug.cgi?id=28180.

I've noticed, that in python such symbols have the line=0.
Is it correct to use this as a sign that the symbol is artificial?

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