Add the "existing item" to a new conflict or it is missing from the error output

[Vampire]

No description provided.

[sgrishchenko]

These changes look reasonable, can you provide some sample code to test it in comments? I know it would be better to provide test, but the current test system works badly with negative checks 🙂 I can create an issue to create some unit test and provide checks for negative scenarios.

[Vampire]

Which comments do you mean?
Here?
Just provoke any conflict.
For example two classes named Foo but in different modules.

[sgrishchenko]

An interesting thing is that I tried to do what you said and I received this:

external class Foo {

}

external class Foo {

}

But I wrote the code, yea you are right, there is a bug there.