Spirit-X3 | Boost 1.59 | Compilation never finishes for a recursive grammar

Hello Folks,
I have posted the question in SO as well (
http://stackoverflow.com/questions/43526708/optimizing-the-grammar ), but I
believe I have better chance of getting an answer to my query here.

<Reposting the question here>

I am working on creating an xpath2.0 parser as per the RFC. It's basically a
subproject of another project that I am working on.

After some initial success, I did the mistake of writing a bunch of grammar
rules and AST instead of compiling and testing it at every point. After that
I basically had a novel of template error messages to read (my fault
actually).

I have then then tried to work my way up by trying to compile and test bits
and pieces of the grammar rules individually and now I am stuck with the
compilation process never ending.

I am attaching two files along with this post:
1. All the code in a single cpp file.
2. Broken up the code in multiple files as suggested before in the mailing
list. (as per calc9 example)

Compiler - clang 3.8 on Mac (i7 processor 8 GB RAM)
template-depth - 1024
Boost Version - 1.59

rec_ex_orig.cc
<http://boost.2283326.n4.nabble.com/file/n4693813/rec_ex_orig.cc>  

rec_ex.tar <http://boost.2283326.n4.nabble.com/file/n4693813/rec_ex.tar>  



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