Question

Can interfaces definitions be supported inside class and object?

Such as:

@startuml
class a0 {
-string data
#void testMethod()
circle "Inf a0" as Ia0
}

object a {
-string data
#void testMethod()
circle "Inf a" as Ia
}

Ia0-|>Ia:generalizes
@enduml

Currently this notation gets split rendering:

http://www.plantuml.com/plantuml/uml/ZSyz3i8m3CNnEJc5LHOOAdLcG5qpS8X7OafGIAJOCF1nTpnqOy7Za_u_oRCekjvlnTDwiK24CD7BEpUAzbmNIb0uPyFcqN8YPT4ZwwMbxSx6c7iiJ4EePmi7Wb30vDt7Mz9ELuvA-F7-qbPijKmTtuU0_SALEqf-ilYPQx87lW00



Can interfaces (circles) in this case be rendered inside class and object, like in component diagram?

This would allow to effectively hybrid class diagrams with component diagrams as in example below:
component "a" as a {
       class "b" as b {
            circle "d" as d
       }
}