Ruby

I've just caught up this running our test suite against the newly released ruby 2.4. Here is the repro gist:

 class A def initialize(x) @x = x end def perform puts "performing #{@x} times" end end puts "basic" A.new(1).tap do |a| a.instance_exec do perform end end #puts "advanced"  A.new(1).tap do |a| a.instance_exec(A.new(3), &:perform) end 

The last one output "3 times in all ruby 2's except latest 2.4 .

This seems to apply the to_proc symbol to the object itself, and not the argument of instance_exec, which is a regression.