Hello,

I present you a ruby-dev summary in these days.


[ruby-dev:18818] CFD: adding "condition" and so on for tracing events

  Hiroshi Nakamura suggested that the following events should be
  notified to the tracer, which is set by set_trace_func.

    - condition
      is notified at conditions.

    - load-call
      is notified immediately before loading a file.

    - load-return
      is notified immediately after loading a file.

    - rescue
      is notified at rescue clauses.

  Matz rejected the suggestion since they will make ruby slower.

[ruby-dev:18861] class variables

  Matz proposed the better specification of class variable as follows.
  He welcomes advice.

  (1) In a toplevel layer of a class, uninitialized class variables
      is forbidden to be substituted in a method.
      He thinks that we had better initialize them like constants.

  (2) In a declaration of a singleton class, initializing class variables
      are forbidden.
      It is because class variables belong to the most inner class/module
      which is not singleton.

  (3) Substituting class variables *outside of method definitions* give a
      warning. This is an early detection of the error like constants.

  (4) The scope of class variables is restricted only within the class/module.
      All the subclasses can not access to those class variables.

[ruby-dev:18887] String#substr?

  Takaaki Tateishi proposed a method for checking if a sub-string is exactly
  same as other sub-string without creating a new string object. The method
  suppresses the excessive cost of creating new strings.
  Matz approved the idea, however rejected its method name 'substr?'.

[ruby-dev:18896] spec. of format "%.nx"

  Kazuhisa Yanagawa asked a question about the specification of the method
  'format', since the result of "%.3x"%-10 is "..f6" whereas its precision
  is 3. The specification will be changed as follows.

    "%.4x"%-10 #=> fff6
    "%.3x"%-10 #=> ff6
    "%.2x"%-10 #=> f6
    "%.1x"%-10 #=> f6
-- 
Takaaki Tateishi <ttate / kt.jaist.ac.jp>