little lexer tweak

documentation/index.html.erb

@@ -592,7 +592,7 @@ coffee --print app/scripts/*.coffee > concatenation.js</pre>
     <p>
       <b class="header" style="margin-top: 20px;">0.2.3</b>
       Axed the unsatisfactory <tt>ino</tt> keyword, replacing it with <tt>of</tt> for
-      object comprehensions. They now look like: <tt>for key, value of object</tt>.
+      object comprehensions. They now look like: <tt>for prop, value of object</tt>.
     </p>
 
     <p>

lib/coffee_script/lexer.rb

@@ -87,7 +87,7 @@ module CoffeeScript
       # 'if' will result in an [:IF, "if"] token.
       tag = KEYWORDS.include?(identifier) ? identifier.upcase.to_sym : :IDENTIFIER
       tag = :LEADING_WHEN if tag == :WHEN && [:OUTDENT, :INDENT, "\n"].include?(last_tag)
-      @tokens[-1][0] = :PROPERTY_ACCESS if tag == :IDENTIFIER && last_value == '.' && !(@tokens[-2][1] == '.')
+      @tokens[-1][0] = :PROPERTY_ACCESS if tag == :IDENTIFIER && last_value == '.' && !(@tokens[-2] && @tokens[-2][1] == '.')
       @tokens[-1][0] = :PROTOTYPE_ACCESS if tag == :IDENTIFIER && last_value == '::'
       token(tag, identifier)
       @i += identifier.length

test/fixtures/execution/test_array_comprehension.coffee

@@ -5,8 +5,8 @@ print(results.join(',') is '2,18')
 
 
 obj:   {one: 1, two: 2, three: 3}
-names: key + '!' for key of obj
-odds:  key + '!' for key, value of obj when value % 2 isnt 0
+names: prop + '!' for prop of obj
+odds:  prop + '!' for prop, value of obj when value % 2 isnt 0
 
 print(names.join(' ') is "one! two! three!")
 print(odds.join(' ')  is "one! three!")