path

        # Thread::Backtrace::Location.path

(from ruby core)
### Implementation from Location
---
    path()

---

Returns the file name of this frame. This will generally be an absolute
path, unless the frame is in the main script, in which case it will be
the script location passed on the command line.

For example, using `caller_locations.rb` from
Thread::Backtrace::Location

    loc = c(0..1).first
    loc.path #=> caller_locations.rb