delete deprecated IO-like methods

This commit deletes
{IO,ARGF,StringIO,Zib::GZipReader}#{bytes,chars,lines,codepoints}, which
have been deprecated since c47c095b9740e7c19d6fdca29ab661c1089221d4.

Note that String also has those methods.  They are neither depreacted
nor deleted because they are not aliases of counterpart each_something.

6 files changed, 35 insertions, 26 deletions

diff --git a/spec/ruby/library/stringio/bytes_spec.rb b/spec/ruby/library/stringio/bytes_spec.rb
index 692fba997f..bf0d27615e 100644
--- a/spec/ruby/library/stringio/bytes_spec.rb
+++ b/spec/ruby/library/stringio/bytes_spec.rb
@@ -2,10 +2,12 @@ require_relative '../../spec_helper'
 require 'stringio'
 require_relative 'shared/each_byte'
 
-describe "StringIO#bytes" do
-  it_behaves_like :stringio_each_byte, :bytes
-end
+ruby_version_is ''...'2.8' do
+  describe "StringIO#bytes" do
+    it_behaves_like :stringio_each_byte, :bytes
+  end
 
-describe "StringIO#bytes when self is not readable" do
-  it_behaves_like :stringio_each_byte_not_readable, :bytes
+  describe "StringIO#bytes when self is not readable" do
+    it_behaves_like :stringio_each_byte_not_readable, :bytes
+  end
 end
diff --git a/spec/ruby/library/stringio/chars_spec.rb b/spec/ruby/library/stringio/chars_spec.rb
index 7dc55d4b37..e3879c2cff 100644
--- a/spec/ruby/library/stringio/chars_spec.rb
+++ b/spec/ruby/library/stringio/chars_spec.rb
@@ -2,10 +2,12 @@ require_relative '../../spec_helper'
 require 'stringio'
 require_relative 'shared/each_char'
 
-describe "StringIO#chars" do
-  it_behaves_like :stringio_each_char, :chars
-end
+ruby_version_is ''...'2.8' do
+  describe "StringIO#chars" do
+    it_behaves_like :stringio_each_char, :chars
+  end
 
-describe "StringIO#chars when self is not readable" do
-  it_behaves_like :stringio_each_char_not_readable, :chars
+  describe "StringIO#chars when self is not readable" do
+    it_behaves_like :stringio_each_char_not_readable, :chars
+  end
 end
diff --git a/spec/ruby/library/stringio/codepoints_spec.rb b/spec/ruby/library/stringio/codepoints_spec.rb
index cc2e5d1b5d..6ca395c964 100644
--- a/spec/ruby/library/stringio/codepoints_spec.rb
+++ b/spec/ruby/library/stringio/codepoints_spec.rb
@@ -3,7 +3,10 @@ require_relative '../../spec_helper'
 require_relative 'fixtures/classes'
 require_relative 'shared/codepoints'
 
-# See redmine #1667
-describe "StringIO#codepoints" do
-  it_behaves_like :stringio_codepoints, :codepoints
+ruby_version_is ''...'2.8' do
+
+  # See redmine #1667
+  describe "StringIO#codepoints" do
+    it_behaves_like :stringio_codepoints, :codepoints
+  end
 end
diff --git a/spec/ruby/library/stringio/each_char_spec.rb b/spec/ruby/library/stringio/each_char_spec.rb
index 7305162ee6..14b2f09a17 100644
--- a/spec/ruby/library/stringio/each_char_spec.rb
+++ b/spec/ruby/library/stringio/each_char_spec.rb
@@ -7,5 +7,5 @@ describe "StringIO#each_char" do
 end
 
 describe "StringIO#each_char when self is not readable" do
-  it_behaves_like :stringio_each_char_not_readable, :chars
+  it_behaves_like :stringio_each_char_not_readable, :each_char
 end
diff --git a/spec/ruby/library/stringio/each_codepoint_spec.rb b/spec/ruby/library/stringio/each_codepoint_spec.rb
index 85aa34d9d8..f18de22aad 100644
--- a/spec/ruby/library/stringio/each_codepoint_spec.rb
+++ b/spec/ruby/library/stringio/each_codepoint_spec.rb
@@ -5,5 +5,5 @@ require_relative 'shared/codepoints'
 
 # See redmine #1667
 describe "StringIO#each_codepoint" do
-  it_behaves_like :stringio_codepoints, :codepoints
+  it_behaves_like :stringio_codepoints, :each_codepoint
 end
diff --git a/spec/ruby/library/stringio/lines_spec.rb b/spec/ruby/library/stringio/lines_spec.rb
index d9dd26c2e2..0a2ab0d817 100644
--- a/spec/ruby/library/stringio/lines_spec.rb
+++ b/spec/ruby/library/stringio/lines_spec.rb
@@ -2,18 +2,20 @@ require_relative '../../spec_helper'
 require 'stringio'
 require_relative 'shared/each'
 
-describe "StringIO#lines when passed a separator" do
-  it_behaves_like :stringio_each_separator, :lines
-end
+ruby_version_is ''...'2.8' do
+  describe "StringIO#lines when passed a separator" do
+    it_behaves_like :stringio_each_separator, :lines
+  end
 
-describe "StringIO#lines when passed no arguments" do
-  it_behaves_like :stringio_each_no_arguments, :lines
-end
+  describe "StringIO#lines when passed no arguments" do
+    it_behaves_like :stringio_each_no_arguments, :lines
+  end
 
-describe "StringIO#lines when self is not readable" do
-  it_behaves_like :stringio_each_not_readable, :lines
-end
+  describe "StringIO#lines when self is not readable" do
+    it_behaves_like :stringio_each_not_readable, :lines
+  end
 
-describe "StringIO#lines when passed chomp" do
-  it_behaves_like :stringio_each_chomp, :lines
+  describe "StringIO#lines when passed chomp" do
+    it_behaves_like :stringio_each_chomp, :lines
+  end
 end