Change to raise TypeError (Hash#merge, #merge!)

mrbgems/mruby-hash-ext/mrblib/hash.rb

@@ -22,7 +22,7 @@ class Hash
   #
 
   def merge!(other, &block)
-    raise "can't convert argument into Hash" unless other.respond_to?(:to_hash)
+    raise TypeError, "can't convert argument into Hash" unless other.respond_to?(:to_hash)
     if block
       other.each_key{|k|
         self[k] = (self.has_key?(k))? block.call(k, self[k], other[k]): other[k]

mrbgems/mruby-hash-ext/test/hash.rb

@@ -16,6 +16,10 @@ assert('Hash#merge!') do
                'xyz_key' => 'xyz_value' }, result_1)
   assert_equal({'abc_key' => 'abc_value', 'cba_key' => 'cba_value',
                'xyz_key' => 'xyz_value' }, result_2)
+
+  assert_raise(TypeError) do
+    { 'abc_key' => 'abc_value' }.merge! "a"
+  end
 end
 
 assert('Hash#values_at') do

mrblib/hash.rb

@@ -179,7 +179,7 @@ class Hash
   # ISO 15.2.13.4.22
   def merge(other, &block)
     h = {}
-    raise "can't convert argument into Hash" unless other.respond_to?(:to_hash)
+    raise TypeError, "can't convert argument into Hash" unless other.respond_to?(:to_hash)
     other = other.to_hash
     self.each_key{|k| h[k] = self[k]}
     if block

test/t/hash.rb

@@ -223,6 +223,10 @@ assert('Hash#merge', '15.2.13.4.22') do
                 'xyz_key' => 'xyz_value' }, result_1)
   assert_equal({'abc_key' => 'abc_value', 'cba_key' => 'cba_value',
                 'xyz_key' => 'xyz_value' }, result_2)
+
+  assert_raise(TypeError) do
+    { 'abc_key' => 'abc_value' }.merge "a"
+  end
 end
 
 assert('Hash#replace', '15.2.13.4.23') do