Pre script: Just saw John's reply while typing the below mail and most
likely this mail is of no use. I am still sending it in case it helps by
any chance.

I had a quick peek at token.cc. It looks like parse_ident() would be the
function responsible for tokenising variable names. It's core logic checks
for

std::isalnum(c) || c == '_'

It looks like it should accept (in regex):
[_a-zA-Z0-9]+

So, the problem is probably at a higher level.

-- 
*Harshad RJ* <http://lavadip.com>

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