Fix showing syntax error line

lib/rdoc/parser/ruby.rb

@@ -2074,13 +2074,16 @@ def scan
           $stderr.puts @file_name
           return
         end
-        bytes = ''
 
         if @scanner_point >= @scanner.size
           now_line_no = @scanner[@scanner.size - 1][:line_no]
         else
           now_line_no = peek_tk[:line_no]
         end
+        first_tk_index = @scanner.find_index { |tk| tk[:line_no] == now_line_no }
+        last_tk_index = @scanner.find_index { |tk| tk[:line_no] == now_line_no + 1 }
+        last_tk_index = last_tk_index ? last_tk_index - 1 : @scanner.size - 1
+        code = @scanner[first_tk_index..last_tk_index].map{ |t| t[:text] }.join
 
         $stderr.puts <<-EOF
 
@@ -2089,12 +2092,9 @@ def scan
 
         EOF
 
-        unless bytes.empty? then
+        unless code.empty? then
+          $stderr.puts code
           $stderr.puts
-          now_line_no = peek_tk[:line_no]
-          start_index = @scanner.find_index { |tk| tk[:line_no] == now_line_no }
-          end_index = @scanner.find_index { |tk| tk[:line_no] == now_line_no + 1 } - 1
-          $stderr.puts @scanner[start_index..end_index].join
         end
 
         raise e

test/test_rdoc_parser_ruby.rb

@@ -813,6 +813,31 @@ def test_parse_class_lower_name_warning
     assert_match(/Expected class name or '<<'\. Got/, err)
   end
 
+  def test_parse_syntax_error_code
+    @options.verbosity = 2
+    stds = capture_io do
+      begin
+        util_parser <<INVALID_CODE
+# invalid class name
+class Invalid::@@Code
+end
+INVALID_CODE
+        @parser.scan
+      rescue
+      end
+    end
+    err = stds[1]
+
+    expected = <<EXPECTED
+RDoc::Parser::Ruby failure around line 2 of
+#{@filename}
+
+class Invalid::@@Code
+EXPECTED
+
+    assert_match(expected, err)
+  end
+
   def test_parse_multi_ghost_methods
     util_parser <<-'CLASS'
 class Foo