Port upstream r66952 (r66888)

* Fix rubyspec to follow IO#ungetbyte's fix
  Merge CRuby r66824
  With fixing actual spec and the version the change applied.

ruby/ruby@b228a08

Author: sorah

debian/patches/0009-merge-revision-s-66888-Backport-15460.patch

@@ -0,0 +1,41 @@
+From: naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+Date: Wed, 30 Jan 2019 13:09:26 +0000
+Subject: merge revision(s) 66888: [Backport #15460]
+
+* Fix rubyspec to follow IO#ungetbyte's fix
+  Merge CRuby r66824
+  With fixing actual spec and the version the change applied.
+
+git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@66952 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
+---
+ spec/ruby/core/io/ungetbyte_spec.rb | 9 +++++----
+ 1 file changed, 5 insertions(+), 4 deletions(-)
+
+diff --git a/spec/ruby/core/io/ungetbyte_spec.rb b/spec/ruby/core/io/ungetbyte_spec.rb
+index 2e51fb0..f5f9a11 100644
+--- a/spec/ruby/core/io/ungetbyte_spec.rb
++++ b/spec/ruby/core/io/ungetbyte_spec.rb
+@@ -49,7 +49,7 @@
+     end
+   end
+ 
+-  ruby_version_is '2.6'...'2.7' do
++  ruby_version_is '2.6'...'2.6.1' do
+     it "is an RangeError if the integer is not in 8bit" do
+       for i in [4095, 0x4f7574206f6620636861722072616e6765] do
+         lambda { @io.ungetbyte(i) }.should raise_error(RangeError)
+@@ -57,10 +57,11 @@
+     end
+   end
+ 
+-  ruby_version_is '2.7' do
++  ruby_version_is '2.6.1' do
+     it "never raises RangeError" do
+-      for i in [4095, 0x4f7574206f6620636861722072616e6765] do
+-        lambda { @io.ungetbyte(i) }.should_not raise_error
++      for i in [4095, 0x4f7574206f6620636861722072616e67ff] do
++        @io.ungetbyte(i).should be_nil
++        @io.getbyte.should == 255
+       end
+     end
+   end

debian/patches/series

@@ -6,3 +6,4 @@
 0006-Port-to-kfreebsd-amd64.patch
 0007-Fix-tests-when-ruby-program-suffix-is-used-without-r.patch
 0008-Unset-SOURCE_DATE_EPOCH-on-Rubygems-test-cases.patch
+0009-merge-revision-s-66888-Backport-15460.patch