how to use pi()?

[Jiqiang Guo]

../../../../../bin/stanc --name=fire fire.stan.0

Model name=fire

Input file=fire.stan.0

Output file=fire.cpp

ERROR PARSING

LOCATION:  file=input; line=38, column=21

     tmp <- sqrt(2 * pi()) * alpha * sigma * Phi(alpha * sigma) * exp(0.5 * pow(alpha * sigma, 2));

                    ^-- here

DIAGNOSTIC(S) FROM PARSER:

variable "pi" does not exist.

variable "pi" does not exist.

Parser expecting: <unnamed-rule>

--

Jiqiang

[Bob Carpenter]

That's a bug -- thanks for catching it.

I've added a test and will fix the problem ASAP.

- Bob

[Bob Carpenter]

I just pushed the patch (and test),
so pi() and the other constants should
work now.

It was my fault for not understanding the
base case of the sequence w. separator
rules in the parser which don't include the empty
sequence (which seems like a bad design choice
on Boost's part, but easy enough to patch up
on our end).

- Bob