parse.y: use rb_fstring() for strings stored in the symbol table

* parse.y (register_symid_str): use fstrings in symbol table
  [Bug #9171] [ruby-core:58656]
* parse.y (rb_id2str): ditto
* string.c (rb_fstring): create frozen_strings on first usage. this
  allows rb_fstring() calls from the parser (before cString is created)
* string.c (fstring_set_class_i): set klass on fstrings generated
  before cString was defined
* string.c (Init_String): convert frozen_strings table to String
  objects after boot
* ext/-test-/symbol/type.c (bug_sym_id2str): expose rb_id2str()
* test/-ext-/symbol/test_type.rb (module Test_Symbol): verify symbol
  table entries are fstrings

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44057 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 0 deletions

diff --git a/test/-ext-/symbol/test_type.rb b/test/-ext-/symbol/test_type.rb
index d6816754c8..9053d936e2 100644
--- a/test/-ext-/symbol/test_type.rb
+++ b/test/-ext-/symbol/test_type.rb
@@ -3,6 +3,16 @@ require "-test-/symbol"
 
 module Test_Symbol
   class TestType < Test::Unit::TestCase
+    def test_id2str_fstring_bug9171
+      fstr = eval("# encoding: us-ascii
+        'foobar'.freeze")
+      assert_same fstr, Bug::Symbol.id2str(:foobar)
+
+      fstr = eval("# encoding: us-ascii
+        '>'.freeze")
+      assert_same fstr, Bug::Symbol.id2str(:>)
+    end
+
     def assert_symtype(sym, pred, msg = nil)
       assert_send([Bug::Symbol, pred, sym], msg)
     end