nested ternary operators are parsed incorrectly

[GoogleCodeExporter]

What steps will reproduce the problem?
Run:
    echo a ? b ? c : d : e | python sexp.py

What is the expected output? What do you see instead?

It should be equivalent to
    echo a ? (b ? c : d) : e | python sexp.py

, i.e.:

    (SCRIPT
      (TERNARY a (TERNARY b c d) e))

however, instead I get:

    (SCRIPT
      (TERNARY a b (TERNARY c d e)))

which is the same as

    echo (a ? b : c) ? d : e | python sexp.py

Original issue reported on code.google.com by [email protected] on 24 Jan 2014 at 9:29