operator precedence changed: assignment like operators are supported; escaping of operators with \ is supported

todo.txt

@@ -4,14 +4,11 @@ Version 0.8.14
 - bug: s[1..n] = @[] produces wrong C code
 - optimize unused constants away (affected by HLO)
 - fix actors.nim; test with different thread var implementations
-- dead code elim for JS backend
 
 version 0.9.0
 =============
 
-- special precedence rules for assignment operators: If the operator ends with
-  '=' and does **not** start with '<', '>', '!', '=', '~', '?', it is an 
-  assignment operator
+- dead code elim for JS backend; 'of' operator for JS backend
 - test the sort implementation again
 - 'let x = y'
 - const ptr/ref