parse.y: remove "f" suffix [ruby-core:57966] [Feature #9042]

revert r42847 "test_string.rb: add test string encoding"

revert r42846 "parse.y: freeze in advance to reduce objects"

revert r42843 "parse.y: deduplicate frozen string literals"

revert r42780 "test_string.rb: yet another test"

revert r42779 "parse.y: valid suffix word only"

revert r42778 "test_string.rb: remove duplicated code"

revert r42775 "parse.y: force_encoding"

This reverts commit 93ea04ecec.

revert r42773 "Add frozen string literals"

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43634 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_string.rb

@@ -2201,60 +2201,6 @@ class TestString < Test::Unit::TestCase
       })
     end
     assert_equal "hello", str
-    assert_not_predicate str, :frozen?
-  end
-
-  def test_frozen_string
-    assert_equal "hello", "hello"f
-
-    assert_predicate "hello"f, :frozen?
-
-    f = -> { "hello"f }
-
-    assert_equal f.call.object_id, f.call.object_id
-  end
-
-  def test_frozen_dstring
-    assert_equal "hello123", "hello#{123}"f
-
-    assert_predicate "hello#{123}"f, :frozen?
-
-    i = 0
-    f = -> { "#{i += 1}"f }
-    assert_equal "1", f.call
-    assert_equal "2", f.call
-  end
-
-  def test_frozen_string_adjacent
-    str = nil
-    assert_nothing_raised(SyntaxError) do
-      eval(%{
-        str = "hello" "world"f
-      })
-    end
-    assert_equal "helloworld", str
-    assert_predicate str, :frozen?
-  end
-
-  def test_frozen_string_cannot_be_adjacent
-    assert_raise(SyntaxError) do
-      eval(%{
-        "hello"f "world"
-      })
-    end
-  end
-
-  def test_frozen_strings_are_deduplicated
-    a = "hello"f
-    b = "hello"f
-    assert_equal a.object_id, b.object_id
-  end
-
-  def test_frozen_strings_are_deduplicated_with_encoding
-    a = eval("# coding: utf-8\n'hello'f")
-    b = eval("# coding: ascii\n'hello'f")
-    assert_equal Encoding::UTF_8, a.encoding
-    assert_equal Encoding::US_ASCII, b.encoding
   end
 
   def test_eq_tilde_can_be_overridden