Drop singleton class when flattening.

See https://bugs.ruby-lang.org/issues/12738
jruby · Oct 18, 2017 · a708b16 · a708b16
1 parent ee9d51c
commit a708b16
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/core/src/main/java/org/jruby/RubyArray.java b/core/src/main/java/org/jruby/RubyArray.java
@@ -3110,7 +3110,7 @@ public IRubyObject flatten_bang19(ThreadContext context, IRubyObject arg) {
     public IRubyObject flatten(ThreadContext context) {
         Ruby runtime = context.runtime;
 
-        RubyArray result = new RubyArray(runtime, getMetaClass(), realLength);
+        RubyArray result = new RubyArray(runtime, getMetaClass().getRealClass(), realLength);
         flatten(context, -1, result);
         result.infectBy(this);
         return result;