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.

1 files changed, 33 insertions, 31 deletions

diff --git a/spec/ruby/core/io/bytes_spec.rb b/spec/ruby/core/io/bytes_spec.rb
index feeb493566..f0e993e8f0 100644
--- a/spec/ruby/core/io/bytes_spec.rb
+++ b/spec/ruby/core/io/bytes_spec.rb
@@ -2,42 +2,44 @@
 require_relative '../../spec_helper'
 require_relative 'fixtures/classes'
 
-describe "IO#bytes" do
-  before :each do
-    @io = IOSpecs.io_fixture "lines.txt"
-  end
-
-  after :each do
-    @io.close unless @io.closed?
-  end
+ruby_version_is ''...'2.8' do
+  describe "IO#bytes" do
+    before :each do
+      @io = IOSpecs.io_fixture "lines.txt"
+    end
 
-  it "returns an enumerator of the next bytes from the stream" do
-    enum = @io.bytes
-    enum.should be_an_instance_of(Enumerator)
-    @io.readline.should == "Voici la ligne une.\n"
-    enum.first(5).should == [81, 117, 105, 32, 195]
-  end
+    after :each do
+      @io.close unless @io.closed?
+    end
 
-  it "yields each byte" do
-    count = 0
-    ScratchPad.record []
-    @io.each_byte do |byte|
-      ScratchPad << byte
-      break if 4 < count += 1
+    it "returns an enumerator of the next bytes from the stream" do
+      enum = @io.bytes
+      enum.should be_an_instance_of(Enumerator)
+      @io.readline.should == "Voici la ligne une.\n"
+      enum.first(5).should == [81, 117, 105, 32, 195]
     end
 
-    ScratchPad.recorded.should == [86, 111, 105, 99, 105]
-  end
+    it "yields each byte" do
+      count = 0
+      ScratchPad.record []
+      @io.each_byte do |byte|
+        ScratchPad << byte
+        break if 4 < count += 1
+      end
 
-  it "raises an IOError on closed stream" do
-    enum = IOSpecs.closed_io.bytes
-    -> { enum.first }.should raise_error(IOError)
-  end
+      ScratchPad.recorded.should == [86, 111, 105, 99, 105]
+    end
 
-  it "raises an IOError on an enumerator for a stream that has been closed" do
-    enum = @io.bytes
-    enum.first.should == 86
-    @io.close
-    -> { enum.first }.should raise_error(IOError)
+    it "raises an IOError on closed stream" do
+      enum = IOSpecs.closed_io.bytes
+      -> { enum.first }.should raise_error(IOError)
+    end
+
+    it "raises an IOError on an enumerator for a stream that has been closed" do
+      enum = @io.bytes
+      enum.first.should == 86
+      @io.close
+      -> { enum.first }.should raise_error(IOError)
+    end
   end
 end