question: private boolean overloaded ( MethodSymbol m , TypeSymbol c , Types types ) { for ( com . redhat . ceylon . langtools . tools . javac . util . List < Type > is = types . interfaces ( c . type ) ; is . nonEmpty ( ) ; is = is . tail ) { TypeSymbol i = is . head . tsym ; if ( overloadedIn ( m , i , types ) ) return true ; if ( overloaded ( m , i , types ) ) return true ; } return false ; }
target:  Copied from MethodSymbol.implemented and adapted for overloading