You are trying to use $q as a reference to an anonymous sub. I would expect some code above that line to look something like:

my $q = sub {
  my $var = shift; # 'lang' in this case
  return 1;
}
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You would then call the above subroutine using $q as the reference.

$q->('lang'); # one way
&{$q}('lang'); # another way
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Also, you can find out what kind of a reference $q is with the following (after $q is defined and assigned)

print ref($q);
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I don't know what this has to do with CGI.pm unless you assigned $q as a CGI class reference, and you're using it wrong, or re-assigned it or something...

Perhaps you just forgot to put the sub's name in your statement... for instance:

$q->h1('lang'); # instead of $q->('lang')
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--
Casey