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  1. or download this
    #!/usr/bin/perl

...
print "b : $$b\n";

print "b2 : ${$b}\n";
  2. or download this
    perl -MO=Deparse,-p test_ref.pl

...
print("b : $$b\n");
print("b2 : ${$b;}\n");
test_ref.pl syntax OK
  3. or download this
    perl -Dt  test_ref.pl

...
(test_ref.pl:9) print
b2 : foo
(test_ref.pl:9) leave
  4. or download this
    (test_ref.pl:4) nextstate             (test_ref.pl:7) nextstate
(test_ref.pl:7) pushmark              (test_ref.pl:9) pushmark
...
(test_ref.pl:7) concat                (test_ref.pl:9) concat
(test_ref.pl:7) print                 (test_ref.pl:9) print
b : foo                               b2 : foo