stan-dev/stan — pull request #1004 by PeterLi2016 (2014-09-01 02:39:40+00:00)
Title: Feature/test nan as bool

#### Summary:
Added NaN tests for as_bool in agrad/fwd/functions, and agrad/rev/functions with doc on behavior at NaN (in code since the function is not exposed to users).

#### Intended Effect:
Added NaN tests for as_bool in agrad/fwd/functions, and agrad/rev/functions with doc on behavior at NaN (in code since the function is not exposed to users).

#### How to Verify:
Run test/unit-agrad-fwd/functions/as_bool, test/unit-agrad-rev/functions/as_bool

#### Side Effects:
None.

#### Documentation:
Added doc on behavior of as_bool at NaN in code.

#### Reviewer Suggestions:
Anyone.