parse.y: junk sigil only names

* parse.y (intern_str): sigil only names are junk, at least one
  identifier character is needed.  [ruby-dev:47723] [Bug #8928]
* parse.y (rb_enc_symname_type): fix out of bound access.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42988 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 0 deletions

diff --git a/test/ruby/test_object.rb b/test/ruby/test_object.rb
index b46403ad6f..d33884e036 100644
--- a/test/ruby/test_object.rb
+++ b/test/ruby/test_object.rb
@@ -163,6 +163,8 @@ class TestObject < Test::Unit::TestCase
     o.instance_eval { @foo = :foo }
     assert_equal(:foo, o.instance_variable_get(:@foo))
     assert_equal(nil, o.instance_variable_get(:@bar))
+    assert_raise(NameError) { o.instance_variable_get('@') }
+    assert_raise(NameError) { o.instance_variable_get(:'@') }
     assert_raise(NameError) { o.instance_variable_get(:foo) }
     assert_raise(NameError) { o.instance_variable_get("bar") }
     assert_raise(TypeError) { o.instance_variable_get(1) }
@@ -178,6 +180,8 @@ class TestObject < Test::Unit::TestCase
     o = Object.new
     o.instance_variable_set(:@foo, :foo)
     assert_equal(:foo, o.instance_eval { @foo })
+    assert_raise(NameError) { o.instance_variable_set(:'@', 1) }
+    assert_raise(NameError) { o.instance_variable_set('@', 1) }
     assert_raise(NameError) { o.instance_variable_set(:foo, 1) }
     assert_raise(NameError) { o.instance_variable_set("bar", 1) }
     assert_raise(TypeError) { o.instance_variable_set(1, 1) }
@@ -195,6 +199,8 @@ class TestObject < Test::Unit::TestCase
     o.instance_eval { @foo = :foo }
     assert_equal(true, o.instance_variable_defined?(:@foo))
     assert_equal(false, o.instance_variable_defined?(:@bar))
+    assert_raise(NameError) { o.instance_variable_defined?(:'@') }
+    assert_raise(NameError) { o.instance_variable_defined?('@') }
     assert_raise(NameError) { o.instance_variable_defined?(:foo) }
     assert_raise(NameError) { o.instance_variable_defined?("bar") }
     assert_raise(TypeError) { o.instance_variable_defined?(1) }