The linker is unable to determine whether suppression is redundant when feature switches are used.

```csharp
public static bool IsFeatureEnabled {
get => throw new NotImplementedException ();
}

[UnconditionalSuppressMessage ("Test", "IL2072")]
public static void Method()
{
if (IsFeatureEnabled) {
// Trigger IL2072 warning.
} else {
// Trimmer compatible code.
}
}
```

Let us assume we are using feature substitutions to set the return value of the `IsFeatureEnabled` getter to either true or false.

The linker is unable to determine whether the suppression on `Method` is redundant. Enabling the feature will make the suppression useful, disabling it makes the suppression redundant.