nicer syntax error messages for newlines and indentation

lib/coffee_script/parse_error.rb

@@ -5,6 +5,12 @@ module CoffeeScript
   # line-number aware.
   class ParseError < Racc::ParseError
 
+    TOKEN_MAP = {
+      'INDENT'  => 'indent',
+      'OUTDENT' => 'outdent',
+      "\n"      => 'newline'
+    }
+
     def initialize(token_id, value, stack)
       @token_id, @value, @stack = token_id, value, stack
     end
@@ -13,7 +19,7 @@ module CoffeeScript
       line      = @value.respond_to?(:line) ? @value.line : "END"
       line_part = "line #{line}:"
       id_part   = @token_id != @value.inspect ? ", unexpected #{@token_id.to_s.downcase}" : ""
-      val_part  = ['INDENT', 'OUTDENT'].include?(@token_id) ? '' : " for '#{@value.to_s}'"
+      val_part  = " for #{TOKEN_MAP[@value.to_s] || "'#{@value}'"}"
       "#{line_part} syntax error#{val_part}#{id_part}"
     end
     alias_method :inspect, :message