Reproduce sbt/sbt#2560

Unlike other scripted macro tests, the call site of this macro is
`Provider.tree(0)`, which does not introduce internal member reference.
Instead the macro itself calls `Bar.bar(0)`. Due to #2560, the expanded
tree is not traversed, and thus the reference to `Bar` is not caught
during incremental compilation.

sbt/src/sbt-test/source-dependencies/macro-nonarg-dep/build.sbt

@@ -0,0 +1,22 @@
+val defaultSettings = Seq(
+  scalaVersion := "2.11.8",
+  libraryDependencies <+= scalaVersion("org.scala-lang" % "scala-reflect" % _ )//,
+  //incOptions := incOptions.value.withNameHashing(true)
+)
+
+lazy val root = (project in file(".")).
+  aggregate(macroProvider, macroClient).
+  settings(
+    defaultSettings
+  )
+
+lazy val macroProvider = (project in file("macro-provider")).
+  settings(
+    defaultSettings
+  )
+
+lazy val macroClient = (project in file("macro-client")).
+  dependsOn(macroProvider).
+  settings(
+    defaultSettings
+  )

sbt/src/sbt-test/source-dependencies/macro-nonarg-dep/changes/Bar.scala

@@ -0,0 +1,5 @@
+package example
+
+object Bar {
+  def bar(x: Int, y: Int): Int = x
+}

sbt/src/sbt-test/source-dependencies/macro-nonarg-dep/macro-client/Bar.scala

@@ -0,0 +1,5 @@
+package example
+
+object Bar {
+  def bar(x: Int): Int = x
+}

sbt/src/sbt-test/source-dependencies/macro-nonarg-dep/macro-client/Client.scala

@@ -0,0 +1,5 @@
+package example
+
+object Client {
+  def foo: Unit = Provider.tree(0)
+}

sbt/src/sbt-test/source-dependencies/macro-nonarg-dep/macro-provider/Provider.scala

@@ -0,0 +1,16 @@
+package example
+
+import scala.language.experimental.macros
+import scala.reflect.macros._
+
+object Provider {
+  def tree(args: Any): Any = macro treeImpl
+  def treeImpl(c: Context)(args: c.Expr[Any]) = {
+    import c.universe._
+    c.Expr[Any](
+      Apply(
+        Select(Ident(TermName("Bar")), TermName("bar")),
+        List(Literal(Constant(0))))
+    )
+  }
+}

sbt/src/sbt-test/source-dependencies/macro-nonarg-dep/test

@@ -0,0 +1,11 @@
+> compile
+
+## Replace client-side file Bar.scala to something that should not compile
+$ copy-file changes/Bar.scala macro-client/Bar.scala
+
+## Expect failure here
+-> macroClient/compile
+
+## It should still fail after clean
+> macroClient/clean
+-> macroClient/compile