This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Thread.set_trace_func (from ruby core) --- thr.set_trace_func(proc) -> proc thr.set_trace_func(nil) -> nil --- Establishes *proc* on *thr* as the handler for tracing, or disables tracing if the parameter is `nil`. See Kernel#set_trace_func.
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.