You never captured $x. It was simply still in scope. You basically did 
my $x="global";
my $test=sub {
  my $x="pre";
   
  alert($x);           # pre

    my ($name,$val)=@_;
    eval('$'.$name."='".$val."'");

  alert($x);           # post
}

[download]
which we've already established should work. Call the sub from outside the scope in which $x resides and you'll see it fail.

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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