\&Foo::some_sub autovivifies a sub stub at run-time (just like sub Foo::some_sub; would at compile-time).

So it will work fine as long as we don't make any reference to the sub in any compiled code that comes before the definition. 

use B;

$\="\n";

# line 99 'bin/some_code.pl'
{
    no strict 'refs';
    print B::svref_2object(eval q(\\*{'Foo::some_sub'}))->LINE;
    print B::svref_2object(eval q(\\&Foo::some_sub))->GV->LINE;
}
eval q{Foo::some_sub()};

package Foo;
# line 23 'bin/some_file.pl'
sub some_sub {
    warn "Got to here";
}
__END__
25
25
Got to here at 'bin/some_file.pl' line 24.

[download]

Of course, string eval has a code smell, but so does no strict 'refs'.

In reply to Re^3: Getting file and line number where a subroutine is declared by kyle
in thread Getting file and line number where a subroutine is declared by Ovid

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