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backtrace_locations 

        # Fiber.backtrace_locations

(from ruby core)
---
    fiber.backtrace_locations -> array
    fiber.backtrace_locations(start) -> array
    fiber.backtrace_locations(start, count) -> array
    fiber.backtrace_locations(start..end) -> array

---

Like #backtrace, but returns each line of the execution stack as a
Thread::Backtrace::Location. Accepts the same arguments as #backtrace.

    f = Fiber.new { Fiber.yield }
    f.resume
    loc = f.backtrace_locations.first
    loc.label  #=> "yield"
    loc.path   #=> "test.rb"
    loc.lineno #=> 1

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