fluent/fluentd-ui — pull request #89 by kou (2014-10-05 07:02:56+00:00)
Title: Suppress "already initialized constant KEYS" warning

`Class.new {...}` uses a closure to define a class. Closure keeps
environment that includes local variables and so on. Assignment changes
the environment. So `klass = Class.new { KEYS = [] }` doesn't define
`klass::KEYS`. It defines `Object::KEYS`.

a = 1
Class.new do
a = 2
X = 3
end
p a # => 2
p X # => 3

We need to use `const_set` to define a constant in `Class.new {...}`.