OK, I'm still not sure what's going on.
I ran

foreach my $key (sort keys %clocks){
  print_clock_assertions({ $clocks{$key} });       #line 32
}
sub print_clock_assertions {
  my($hashref)=$_[0];
  print STDOUT "ref 1 :$hashref->{'speed'}\n";     #line 44
  }
[download]

and got loads of

Odd number of elements in hash assignment at parse_timing_info.pl line
+ 32.
Use of uninitialized value in concatenation (.) at parse_timing_info.p
+l line 44.
ref 1 :
[download]

does $hashref contain the has reference when I do this?

PS Why how do stop the square bracket being removed?

Edit: chipmunk 2001-04-19