* struct.c (rb_struct_set): return assigned value from setter method

  rather than struct object. [Bug ruby#9353] [ruby-core:59509]

* test/ruby/test_struct.rb (test_setter_method_returns_value): add test

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44501 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Conflicts:
	ChangeLog

Author: charliesome

struct.c

@@ -156,7 +156,8 @@ rb_struct_set(VALUE obj, VALUE val)
     for (i=0; i<len; i++) {
 	slot = RARRAY_AREF(members, i);
 	if (rb_id_attrset(SYM2ID(slot)) == rb_frame_this_func()) {
-	    return RSTRUCT_SET(obj, i, val);
+	    RSTRUCT_SET(obj, i, val);
+	    return val;
 	}
     }
     rb_name_error(rb_frame_this_func(), "`%s' is not a struct member",

test/ruby/test_struct.rb

@@ -298,6 +298,12 @@ def test_bang_mark_in_member
     assert_same(x, o.b!)
   end
 
+  def test_setter_method_returns_value
+    klass = @Struct.new(:a)
+    x = klass.new
+    assert_equal "[Bug #9353]", x.send(:a=, "[Bug #9353]")
+  end
+
   class TopStruct < Test::Unit::TestCase
     include TestStruct