Error when implementing java varargs method on anonymous type with explicit type #4729
Description
I've got a compiler error when trying to implement a java interface which has a method with vararg parameter using a anonymous class. It is strange 'cause it only happens when i explicit define its type. See example bellow:
// Java Interface:
public interface VarArgs {
public void method(String... s);
}
// Scala class:
class ScalaVarArgs extends VarArgs {
// -- no problem on overriding it using ordinary class
def method(s: String*) { println(s) }
}
object ScalaVarArgs {
def main(args: Array[String]) {
//[1] Ok - no problem using inferred type
val varArgs = new VarArgs {
def method(s: String*) { println(s) }
}
varArgs.method("1", "2")
//[2] Ok -- no problem when explicit set its type after construction
val b: VarArgs = varArgs
b.method("1", "2")
//[3] Ok -- no problem on calling its method
(new ScalaVarArgs).method("1", "2")
(new ScalaVarArgs: VarArgs).method("1", "2")
//[4] Not Ok -- error when assigning anonymous class to a explictly typed val
// Compiler error: object creation impossible, since method method in trait VarArgs of type (s: <repeated...>[java.lang.String])Unit is not defined
val tagged: VarArgs = new VarArgs {
def method(s: String*) { println(s) }
}
}
} Note: this error/doubt was original post at scala-users mail list: http://groups.google.com/group/scala-user/browse_thread/thread/85757cea2cd25069/27817e912c89a6f5?lnk=gst&q=fabio.veronez#27817e912c89a6f5