Avoid rededinition warnings [#61]

VERSION.yml

@@ -1,5 +1,5 @@
 ---
 :major: 2
 :minor: 6
-:patch: 2
+:patch: 3
 :build: 

backports.gemspec

@@ -5,11 +5,11 @@
 
 Gem::Specification.new do |s|
   s.name = "backports"
-  s.version = "2.6.2"
+  s.version = "2.6.3"
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.authors = ["Marc-Andr\u{e9} Lafortune"]
-  s.date = "2012-07-20"
+  s.date = "2012-08-13"
   s.description = "      Essential backports that enable some of the really nice features of ruby 1.8.7, ruby 1.9 and rails from ruby 1.8.6 and earlier.\n"
   s.email = "github@marc-andre.ca"
   s.extra_rdoc_files = [

lib/backports/1.9.2/stdlib/matrix.rb

@@ -18,10 +18,8 @@ module ExceptionForMatrix # :nodoc:
   def_e2message(TypeError, "wrong argument type %s (expected %s)")
   def_e2message(ArgumentError, "Wrong # of arguments(%d for %d)")
 
-  def_exception("ErrDimensionMismatch", "\#{self.name} dimension mismatch")
-  def_exception("ErrNotRegular", "Not Regular Matrix")
-  def_exception("ErrOperationNotDefined", "Operation(%s) can\\'t be defined: %s op %s")
-  def_exception("ErrOperationNotImplemented", "Sorry, Operation(%s) not implemented: %s op %s")
+  def_exception("ErrOperationNotDefined", "Operation(%s) can\\'t be defined: %s op %s") unless const_defined?(:ErrOperationNotDefined, false)
+  def_exception("ErrOperationNotImplemented", "Sorry, Operation(%s) not implemented: %s op %s") unless const_defined?(:ErrOperationNotImplemented, false)
 end
 
 #
@@ -513,7 +511,7 @@ def each_with_index(which = :all) # :yield: e, row, column
     self
   end
 
-  SELECTORS = {:all => true, :diagonal => true, :off_diagonal => true, :lower => true, :strict_lower => true, :strict_upper => true, :upper => true}.freeze
+  SELECTORS = {:all => true, :diagonal => true, :off_diagonal => true, :lower => true, :strict_lower => true, :strict_upper => true, :upper => true}.freeze unless const_defined?(:SELECTORS)
   #
   # :call-seq:
   #   index(value, selector = :all) -> [row, column]
@@ -610,12 +608,12 @@ def empty?
     column_size == 0 || row_size == 0
   end
 
-  
+
   #
   # Returns +true+ is this is an hermitian matrix.
   # Raises an error if matrix is not square.
   #
-  
+
   def hermitian?
     Matrix.Raise ErrDimensionMismatch unless square?
     each_with_index(:strict_upper).all? do |e, row, col|