'exit' when debugging in REPL puts pry into a broken state

[banister]

Note the -1 prompt ([6] (pry) : -1>) which indicates an empty binding_stack

crow:pry-debugger john$ ruby o.rb 

Frame number: 0/1
Frame type: eval

From: o.rb @ line 24 :

    19: def boink
    20:   x = 30
    21:   puts "hi"
    22: end
    23: 
 => 24: binding.pry

[1] (pry) main: 0> break my
Breakpoint 1: o.rb @ line 7 (Enabled) :

     4:   puts "hi"
     5: end
     6: 
 =>  7: def my
     8:   puts "hey there"
     9:   pig
    10: end

[2] (pry) main: 0> my

Breakpoint 1. First hit.
resume_pry: changing binding to #<Binding:0x007fedda447800>

Frame number: 0/1
Frame type: eval

From: o.rb @ line 7 Object#my:

 =>  7: def my
     8:   puts "hey there"
     9:   pig
    10: end

[3] (pry) main: 0> exit
hey there
putty
hi
=> nil
[5] (pry) : -1> cat o.rb
require 'pry'

def love
  puts "hi"
end

def my
  puts "hey there"
  pig
end

def pig
  x = 10
  y = 30
  puts "putty"
  boink
end

def boink
  x = 30
  puts "hi"
end

binding.pry
[6] (pry) : -1>