* io.c (rb_fopen): mode string copy at the lowest level.

* io.c (rb_io_flags_mode): requires output buffer no more.  no
  allocation needed.

* array.c (rb_ary_index): takes a block to compare items in an
  array.  [ruby-talk:113069] [Ruby2]

* array.c (rb_ary_rindex): ditto.

* marshal.c (r_byte): retrieve pointer from string value for each
  time.  [ruby-dev:24404]

* marshal.c (r_bytes0): ditto.

* enum.c (sort_by_i): re-entrance check added.  [ruby-dev:24399]

* io.c (io_read): should freeze all reading buffer.
  [ruby-dev:24400]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@6996 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/mathn.rb

@@ -16,6 +16,7 @@ require "matrix.rb"
 
 class Integer
 
+  remove_method(:gcd2)
   def gcd2(int)
     a = self.abs
     b = int.abs
@@ -116,6 +117,7 @@ end
 class Rational
   Unify = true
 
+  remove_method(:inspect)
   def inspect
     format "%s/%s", numerator.inspect, denominator.inspect
   end
@@ -228,6 +230,7 @@ class Rational
 end
 
 module Math
+  remove_method(:sqrt)
   def sqrt(a)
     if a.kind_of?(Complex)
       abs = sqrt(a.real*a.real + a.image*a.image)