[ruby-dev:51088] [Ruby master Bug#18067] Composite procs with `instance_exec` aren't executed within the context of the receiver

Issue #18067 has been reported by ttanimichi (Tsukuru Tanimichi).

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Bug #18067: Composite procs with `instance_exec` aren't executed within the context of the receiver
https://bugs.ruby-lang.org/issues/18067

* Author: ttanimichi (Tsukuru Tanimichi)
* Status: Open
* Priority: Normal
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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```ruby
func1 = -> (x) { x + y }

class A
  def y
    10
  end
end

A.new.instance_exec(1, &func1) # => 11

func2 = -> (x) { x * 2 }
f = func1 >> func2
A.new.instance_exec(1, &f) # => undefined local variable or method `y' for main:Object (NameError)
```



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