blab repeated repetition parsing issue

[GoogleCodeExporter]

What steps will reproduce the problem?
1. $ blab -e '42++'
2.
3.

What is the expected output? What do you see instead?
expect *********************************************************************
get 
command line arguments:1 bad grammar:
   `42++ '
     ^

same affects nested {a,b}:s and other repetition operations.

blab -e '(42+)+' naturally works.

Original issue reported on code.google.com by aohelin on 3 Dec 2011 at 7:02