Cannot capture not invokable method error

``` js
var o = {};
assert(o.m());
```

```
TypeError: assert._capt(...).m is not a function
```

``` js
var o = {};
assert(assert._expr(assert._capt(assert._capt(o, 'arguments/0/callee/object').m(), 'arguments/0'), {
    content: 'assert(o.m())',
    ...
}));
```
