[perl #125333] LTA warning "Redeclaration of symbol" (no line number of the first declaration)

[via RT]

# New Ticket Created by  Alex Jakimenko 
# Please include the string:  [perl #125333]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=125333 >


Code:

#!/usr/bin/env perl6
my $foo;
my $foo;

Result:

Potential difficulties:
    Redeclaration of symbol $foo
    at ./test.pl:3
    ------> my $foo⏏;

It would be great if it printed the line number of the first declaration
(e.g. "first declared on line 2").