Add ambiguity test

Author: odersky

tests/neg/creator-ambiguous.scala

@@ -0,0 +1,23 @@
+
+// This used to succeed with old creator methods scheme
+// What happened was: the overloading resolution gave an ambiguous
+// overload, but then the falblback picked the constructor
+object Test:
+
+  case class Record(elems: (String, Any)*)
+
+  object Record:
+
+    inline def apply[R <: Record](elems: (String, Any)*) : R = new Record(elems: _*).asInstanceOf[R]
+
+    def fromUntypedTuple(elems: (String, Any)*): Record = Record(elems: _*) // error: ambiguous overload
+
+  def apply(x: String): Test = Test(x ++ x)
+
+  def apply(x: Integer): Test = Test(x + x)
+
+  Test(null) // error: ambiguous overload
+
+end Test
+
+class Test(x: Object)