gistfile1.txt

  trace = TracePoint.new(:call, :b_call, :c_call) do |tp|
    p [tp.lineno, tp.defined_class, tp.method_id, tp.event]
  end

  trace.enable

  puts "Hello, TracePoint!"

puts [1,2,3].length

[7, Kernel, :puts, :c_call]
[7, IO, :puts, :c_call]
[7, IO, :write, :c_call]
Hello, TracePoint![7, IO, :write, :c_call]

[9, Kernel, :puts, :c_call]
[9, IO, :puts, :c_call]
[9, Fixnum, :to_s, :c_call]
[9, IO, :write, :c_call]
3[9, IO, :write, :c_call]