This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.

set_backtrace 

        # Exception.set_backtrace

(from ruby core)
---
    exc.set_backtrace(backtrace)   ->  array

---

Sets the backtrace information associated with `exc`. The `backtrace`
must be an array of String objects or a single String in the format
described in Exception#backtrace.

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.