Ripper::Lexer: fallback parse error token to the previous one

ext/ripper/lib/ripper/lexer.rb

@@ -103,7 +103,17 @@ class Ripper
 
     # parse the code and returns elements including errors.
     def scan
-      (parse() + errors + @stack.flatten).uniq.sort_by {|e| [*e.pos, (e.message ? -1 : 0)]}
+      result = (parse() + errors + @stack.flatten).uniq.sort_by {|e| [*e.pos, (e.message ? -1 : 0)]}
+      result.each_with_index do |e, i|
+        if e.event == :on_parse_error and e.tok.empty? and (pre = result[i-1]) and
+          pre.pos[0] == e.pos[0] and (pre.pos[1] + pre.tok.size) == e.pos[1]
+          e.tok = pre.tok
+          e.pos[1] = pre.pos[1]
+          result[i-1] = e
+          result[i] = pre
+        end
+      end
+      result
     end
 
     def parse

lib/irb/color.rb

@@ -137,7 +137,7 @@ module IRB # :nodoc:
 
         Ripper::Lexer.new(code).scan.each do |elem|
           str = elem.tok
-          next if allow_last_error and elem.message&.end_with?('meets end of file')
+          next if allow_last_error and /meets end of file|unexpected end-of-input/ =~ elem.message
           next if ([elem.pos[0], elem.pos[1] + str.bytesize] <=> pos) <= 0
 
           str.each_line do |line|

test/irb/test_color.rb

@@ -41,7 +41,7 @@ module TestIRB
         "'a\nb'" => "#{RED}'#{CLEAR}#{RED}a#{CLEAR}\n#{RED}b#{CLEAR}#{RED}'#{CLEAR}",
         "4.5.6" => "#{MAGENTA}#{BOLD}4.5#{CLEAR}#{RED}#{REVERSE}.6#{CLEAR}",
         "[1]]]\u0013" => "[1]]]^S",
-        "\e[0m\n" => "#{RED}#{REVERSE}^[#{CLEAR}[#{BLUE}#{BOLD}0#{CLEAR}m\n",
+        "\e[0m\n" => "#{RED}#{REVERSE}^[#{CLEAR}[#{BLUE}#{BOLD}0#{CLEAR}#{RED}#{REVERSE}m#{CLEAR}\n",
         "%w[a b]" => "#{RED}%w[#{CLEAR}#{RED}a#{CLEAR} #{RED}b#{CLEAR}#{RED}]#{CLEAR}",
         "%i[c d]" => "#{RED}%i[#{CLEAR}#{RED}c#{CLEAR} #{RED}d#{CLEAR}#{RED}]#{CLEAR}",
         "{'a': 1}" => "{#{RED}'#{CLEAR}#{RED}a#{CLEAR}#{RED}':#{CLEAR} #{BLUE}#{BOLD}1#{CLEAR}}",