alias and alias method in RubyEdit

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# keyword, lexically scoped
# arguments are bare identifiers, with no comma between them
alias new_method existing_method

# method defined in the Module class
# takes symbol or string arguments
alias_method :new_method, :existing_method
alias_method 'new_method', 'existing_method'

A note about the lexical scoping of the alias keyword: the value of self is determined at parse time, based on the class context in which the keyword appears. Conversely, alias_method is just a method, so it applies to whatever self happens to be at runtime:

class Foo
  def hello
    puts "Hello from Foo"
  end

  def self.add_alias
    alias hello2 hello
    alias_method :hello3, :hello
  end
end

Foo.add_alias
Foo.new.hello  # => puts "Hello from Foo"
Foo.new.hello2 # => puts "Hello from Foo"
Foo.new.hello3 # => puts "Hello from Foo"

class Bar < Foo
  def hello
    puts "Hello from Bar"
  end
end

Bar.add_alias
Bar.new.hello  # => puts "Hello from Bar"
Bar.new.hello2 # => puts "Hello from Foo"
Bar.new.hello3 # => puts "Hello from Bar"

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