* compile.c (iseq_compile_each): Dynamic string literals should be

frozen.
  [ruby-core:57574] [Feature #8976]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52501 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Mon Nov  9 17:29:09 2015  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* compile.c (iseq_compile_each): Dynamic string literals should be
+	  frozen.
+	  [ruby-core:57574] [Feature #8976]
+
 Mon Nov  9 15:56:07 2015  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
 
 	* common.mk: Use ruby organization url for simplecov repository.

compile.c

@@ -5130,6 +5130,11 @@ iseq_compile_each(rb_iseq_t *iseq, LINK_ANCHOR *ret, NODE * node, int poped)
 	if (poped) {
 	    ADD_INSN(ret, line, pop);
 	}
+	else {
+	    if (iseq->compile_data->option->frozen_string_literal) {
+		ADD_SEND (ret, line, idFreeze, INT2FIX(0));
+	    }
+	}
 	break;
       }
       case NODE_XSTR:{

test/ruby/test_iseq.rb

@@ -175,7 +175,7 @@ class TestISeq < Test::Unit::TestCase
     s1, s2, s3, s4 = compile(code, line, {frozen_string_literal: true}).eval
     assert_predicate(s1, :frozen?)
     assert_predicate(s2, :frozen?)
-    assert_not_predicate(s3, :frozen?)
+    assert_predicate(s3, :frozen?)
     assert_predicate(s4, :frozen?)
     assert_same(s1, s2)
   end