fronzen-string-literal pragma

* compile.c (iseq_compile_each): override compile option by option
  given by pragma.
* iseq.c (rb_iseq_make_compile_option): extract a function to
  overwrite rb_compile_option_t.
* parse.y (parser_set_compile_option_flag): introduce pragma to
  override compile options.
* parse.y (magic_comments): new pragma "fronzen-string-literal".
  [Feature #8976]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51953 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 13 insertions, 0 deletions

diff --git a/test/ruby/test_literal.rb b/test/ruby/test_literal.rb
index 302f487bb6..0d65ebac2c 100644
--- a/test/ruby/test_literal.rb
+++ b/test/ruby/test_literal.rb
@@ -121,6 +121,19 @@ class TestRubyLiteral < Test::Unit::TestCase
     assert_equal "foo\n", `echo #{s}`
   end
 
+  def test_frozen_string
+    all_assertions do |a|
+      a.for("false") do
+        str = eval("# -*- frozen-string-literal: false -*-\n""'foo'")
+        assert_not_predicate(str, :frozen?)
+      end
+      a.for("true") do
+        str = eval("# -*- frozen-string-literal: true -*-\n""'foo'")
+        assert_predicate(str, :frozen?)
+      end
+    end
+  end
+
   def test_regexp
     assert_instance_of Regexp, //
     assert_match(//, 'a')