Implications of MRI's current implementation of bindings...

crazy.rb

def munger(&block)
  block.binding.eval('b = rand(99)')
end
 
def doit
  a = 1
  b = 2
  munger do; end
  puts "a + b = #{a + b}"
end
 
doit

Should you be able to extract an environment from any closure?

• Yes
• No

Should all bindings in the lexical scope of the closure be captured by the environment?

• All
• Only those used
• Only those explicitly specified

Should bindings be live in the environment?

• All bindings are live and mutable
• Bindings are live, but read-only
• Bindings are a snapshot in time
• User specifies state of each binding

What happens if you define a new binding using the environment?

• New binding shadows old binding
• Environment is cloned containing new binding
• Defining new bindings is not allowed