Nothing's captured. $a, $b, $c are still in scope, and we've already established that eval should and can access lexicals in scope.

Place all by the calls to f() in curlies or in a module and you'll see it doesn't capture. 

use strict;

{

my $a = 1;
my $b = 2;
my $c = 3;

sub f {
  my $var = shift;
  print $var, "=", eval "\$$var", "\n";
};

}

&f("a");
&f("b");
&f("c");

[download]
$ perl -w a.pl
Variable "$a" is not available at (eval 1) line 2.
Use of uninitialized value in print at a.pl line 11.
a=
Variable "$b" is not available at (eval 2) line 2.
Use of uninitialized value in print at a.pl line 11.
b=
Variable "$c" is not available at (eval 3) line 2.
Use of uninitialized value in print at a.pl line 11.
c=

[download]

In reply to Re^3: Accessing lexicals in other scopes dynamically by name by ikegami
in thread Accessing lexicals in other scopes dynamically by name by LanX

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