Add test case

Author: odersky

tests/new/semanticdb-extract.scala

@@ -0,0 +1,18 @@
+object A {
+
+  def foo(x: Int) = ()
+  def foo(): Unit = ()
+
+  foo(1)
+  foo()
+
+  "".substring(1)
+  "".substring(1, 2)
+
+  List(1, 2)
+  List.apply()
+  List.`apply`()
+  println(1 + 2)
+
+  case class Foo(x: Int)
+}