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Issue Description:

In a generic class A:

class A<T:ModelType> {

...

T is constrained by:

protocol ModelType: AnyObject, ModelType1, ModelType2 {

    **func** description() -\> String

}

but this does not prevent T from being handled as a Struct value type.

Originally I posted this problem in stack overflow:

https://stackoverflow.com/questions/67233418/swift-memory-conflict-where-it-should-not-happen

Note, that I was not aware of the problem at that point, so the example code is a bit off. But discussion reveals the problem and the bug.

The attached SwiftUI project can be used to reproduce the bug.