String#end_with? should check the base and search strings have compatible encodings.

Author: nirvdrum

spec/ruby/core/string/end_with_spec.rb

@@ -47,4 +47,11 @@
     "céréale".end_with?("réale").should be_true
   end
 
+  it "raises an Encoding::CompatibilityError if the encodings are incompatible" do
+    pat = "ア".encode Encoding::EUC_JP
+    lambda do
+      "あれ".end_with?(pat)
+    end.should raise_error(Encoding::CompatibilityError)
+  end
+
 end

src/main/ruby/core/string.rb

@@ -531,12 +531,12 @@ def encode(to=undefined, from=undefined, options=undefined)
 
   def end_with?(*suffixes)
     suffixes.each do |original_suffix|
-      suffix = Truffle::Type.rb_check_convert_type original_suffix, String, :to_str
-      unless suffix
-        raise TypeError, "no implicit conversion of #{original_suffix.class} into String"
-      end
+      suffix = Truffle::Type.rb_convert_type original_suffix, String, :to_str
+      Truffle::Type.compatible_encoding self, suffix
+
       return true if self[-suffix.length, suffix.length] == suffix
     end
+
     false
   end