Error when using = instead of @

angular.js:11598 Error: [$parse:syntax] Syntax Error: Token '{' invalid key at column 2 of the expression [{{item}}] starting at [{item}}].
http://errors.angularjs.org/1.4.0-beta.2/$parse/syntax?p0=%7B&p1=invalid%20key&p2=2&p3=%7B%7Bitem%7D%7D&p4=%7Bitem%7D%7D
    at REGEX_STRING_REGEXP (angular.js:68)
    at Parser.throwError (angular.js:12002)
    at Parser.object (angular.js:12384)
    at Parser.primary (angular.js:11972)
    at Parser.unary (angular.js:12262)
    at Parser.multiplicative (angular.js:12245)
    at Parser.additive (angular.js:12236)
    at Parser.relational (angular.js:12227)
    at Parser.equality (angular.js:12218)
    at Parser.logicalAND (angular.js:12209)angular.js:11598 (anonymous function)angular.js:8548 $getangular.js:14247 $get.Scope.$digestangular.js:14492 $get.Scope.$applyangular.js:9650 doneangular.js:9840 completeRequestangular.js:9781 requestLoaded