From: Michael Edgar <adgar@...>
Date: 2011-07-24T06:05:57+09:00
Subject: Re: Top level function definition gets in Kernel module?

On Jul 23, 2011, at 4:57 PM, Jean-Pascal Billaud wrote:

> irb(main):001:0> def test_fun
> irb(main):002:1> end
> => nil
> irb(main):003:0> p Object.instance_methods.sort
> [...]
> singleton_methods", "taint", "tainted?", "tap", "test_fun", "to_a",
> "to_enum", "to_s", "type", "untaint"]
> => nil
> irb(main):004:0> p Kernel.methods.sort
> [...]
> "tainted?", "tap", "test", "test_fun", "throw", "to_a", "to_enum",
> "to_s", "trace_var", "trap", "type", "untaint", "untrace_var", "warn"]
> => nil

You wrote Kernel.methods, not Kernel.instance_methods. Kernel.methods
returns the names of all the methods on the Kernel object itself. "Kernel" is
a reference to an object of class Module, which is a subclass of Object.

Thus, since test_fun is an instance method on Object, and Kernel is an instance
of a subclass of Object, it has access to that method as well.

I think you were confused between Kernel.methods and Kernel.instance_methods.
Kernel.instance_methods does not include "test_fun" given this example, as expected.

Michael Edgar
adgar@carboni.ca
http://carboni.ca/