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@ngdoc error
@name $compile:nonassign
@fullName Non-Assignable Expression
@description
This error occurs when a directive defines an isolate scope property
(using the `=` mode in the {@link ng.$compile#description_comprehensive-directive-api_directive-definition-object
`scope` option} of a directive definition) but the directive is used with an expression that is not-assignable.
In order for the two-way data-binding to work, it must be possible to write new values back into the path defined with the expression.
For example, given a directive:
```
myModule.directive('myDirective', function factory() {
return {
...
scope: {
'bind': '=localValue'
}
...
}
});
```
Following are invalid uses of this directive:
```
<!-- ERROR because `1+2=localValue` is an invalid statement -->
<my-directive bind="1+2">
<!-- ERROR because `myFn()=localValue` is an invalid statement -->
<my-directive bind="myFn()">
<!-- ERROR because attribute bind wasn't provided -->
<my-directive>
```
To resolve this error, always use path expressions with scope properties that are two-way data-bound:
```
<my-directive bind="some.property">
<my-directive bind="some[3]['property']">
```
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