adding proper auto-newline escaping

examples/underscore.coffee

@@ -403,9 +403,9 @@ _.isEqual: a, b =>
   return true if _.isNaN(a) and _.isNaN(b)
   # Compare regular expressions.
   if _.isRegExp(a) and _.isRegExp(b)
-    return a.source     is b.source and \
+    return a.source     is b.source and
-           a.global     is b.global and \
+           a.global     is b.global and
-           a.ignoreCase is b.ignoreCase and \
+           a.ignoreCase is b.ignoreCase and
            a.multiline  is b.multiline
   # If a is not an object by this point, we can't handle it.
   return false if atype isnt 'object'

lib/coffee_script/lexer.rb

@@ -34,6 +34,7 @@ module CoffeeScript
     JS_CLEANER = /(\A`|`\Z)/
     MULTILINER = /\n/
     COMMENT_CLEANER = /(^\s*#|\n\s*$)/
+    NO_NEWLINE = /\A([+\*&|\/\-%=<>:!.\\][<>=&|]*|and|or|is|isnt|not|delete|typeof|instanceof)\Z/
 
     # Assignment tokens.
     ASSIGN     = [':', '=']
@@ -157,10 +158,7 @@ module CoffeeScript
       return false unless indent = @chunk[MULTI_DENT, 1]
       @line += indent.scan(MULTILINER).size
       @i += indent.size
-      if last_value == "\\"
+      return suppress_newlines(indent) if last_value.to_s.match(NO_NEWLINE) && last_value != "=>" 
-        @tokens.pop
-        return true
-      end
       size = indent.scan(LAST_DENT).last.last.length
       return newline_token(indent) if size == @indent
       if size > @indent
@@ -193,6 +191,12 @@ module CoffeeScript
       token("\n", "\n") unless last_value == "\n"
       true
     end
+    
+    # Tokens to explicitly escape newlines are removed once their job is done.
+    def suppress_newlines(newlines)
+      @tokens.pop if last_value == "\\"
+      true
+    end
 
     # We treat all other single characters as a token. Eg.: ( ) , . !
     # Multi-character operators are also literal tokens, so that Racc can assign

test/fixtures/execution/test_newline_escaping.coffee

@@ -1,6 +1,6 @@
-six: \
+six:
-1 + \
+  1 +
-2 + \
+  2 +
-3
+  3
 
 print(six is 6)