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kotlinlang

I am trying to filter a list based on a condition that a property inside the list is an enum type. But I get an error on the filter function
```
Type inference failed. The value of the type parameter T should be mentioned in input types (argument types, receiver type or expected type). Try to specify it explicitly.```

`it.procedure.contains(LineBuildActivity.HOLD)` checks if your `List&lt;Procedure&gt;` contains `LineBuildActivity.HOLD`. Since `Procedure` is not the same type as `LineBuildActivity`, it always return false, which in turn makes your filter return an empty list