Don't interpreter $init$ as a constructor when parsing Java files.

Fixes #851.

Author: odersky

src/dotty/tools/dotc/parsing/JavaParsers.scala

@@ -114,7 +114,7 @@ object JavaParsers {
 
     def makeTemplate(parents: List[Tree], stats: List[Tree], tparams: List[TypeDef], needsDummyConstr: Boolean) = {
       def pullOutFirstConstr(stats: List[Tree]): (Tree, List[Tree]) = stats match {
-        case (meth: DefDef) :: rest if meth.name.isConstructorName => (meth, rest)
+        case (meth: DefDef) :: rest if meth.name == CONSTRUCTOR => (meth, rest)
         case first :: rest =>
           val (constr, tail) = pullOutFirstConstr(rest)
           (constr, first :: tail)

tests/pos/i851.java

@@ -0,0 +1,8 @@
+interface I<T> {}
+
+interface J<T> extends I<T> {
+    default void $init$() {
+    };
+}
+
+class C<T> extends J<T> {}