If the programmer forgot to write @FunctionalInterface, java code is converted to interface, even if it only has 1 method. I think if an interface (java) has only 1 method it should be converted to fun interface (kotlin).
What case do you mean exactly? Kotlin doesn’t require
@FunctionalInterface in order to use SAM conversions. You can use any interface with a single abstract method as a function.
I’m talking about converting code from Java to Kotlin (intellij idea).