Merge pull request #3091 from visualsayed/fix_hash_replace_method

protect NoMethodError from calling to_hash in replace

mrblib/hash.rb

@@ -154,6 +154,7 @@ class Hash
   #
   # ISO 15.2.13.4.23
   def replace(hash)
+    raise TypeError, "can't convert argument into Hash" unless hash.respond_to?(:to_hash)
     self.clear
     hash = hash.to_hash
     hash.each_key{|k|

test/t/hash.rb

@@ -239,6 +239,10 @@ assert('Hash#replace', '15.2.13.4.23') do
   a = Hash.new{|h,x| x}
   b.replace(a)
   assert_equal(127, b[127])
+
+   assert_raise(TypeError) do
+    { 'abc_key' => 'abc_value' }.replace "a"
+  end
 end
 
 assert('Hash#shift', '15.2.13.4.24') do