hash value of enumerable should be obtained from its elements; close #1658

2 files changed, 18 insertions, 0 deletions

diff --git a/mrblib/enum.rb b/mrblib/enum.rb
index 0593e1f04..e6aa682dd 100644
--- a/mrblib/enum.rb
+++ b/mrblib/enum.rb
@@ -395,4 +395,13 @@ module Enumerable
   #
   # ISO 15.3.2.2.20
   alias to_a entries
+
+  # redefine #hash 15.3.1.3.15
+  def hash
+    h = 12347
+    self.each do |e|
+      h ^= e.hash
+    end
+    h
+  end
 end
diff --git a/mrblib/range.rb b/mrblib/range.rb
index d43e3c223..7ea795078 100644
--- a/mrblib/range.rb
+++ b/mrblib/range.rb
@@ -28,6 +28,15 @@ class Range
     end
     self
   end
+
+  # redefine #hash 15.3.1.3.15
+  def hash
+    h = first.hash ^ last.hash
+    if self.exclude_end?
+      h += 1
+    end
+    h
+  end
 end
 
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