Add scripted test for nested macros

Add test analogous to source-dependencies/macro-arg-dep
but check if dependencies of nested macro applications are handled
properly. Nested macro applications are tricky because we have to look
into original (before macro expansion) trees recursively. This test verifies
that.

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

@@ -0,0 +1,5 @@
+package macro
+
+object Client {
+	Provider.printTree(Provider.printTree(Foo.str))
+}

sbt/src/sbt-test/source-dependencies/macro-arg-dep-nested/macro-client/Foo.scala

@@ -0,0 +1,5 @@
+package macro
+
+object Foo {
+  def str: String = "abc"
+}

sbt/src/sbt-test/source-dependencies/macro-arg-dep-nested/macro-client/changes/Foo.scala

@@ -0,0 +1,3 @@
+package macro
+object Foo {
+}

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

@@ -0,0 +1,12 @@
+package macro
+import scala.language.experimental.macros
+import scala.reflect.macros._
+
+object Provider {
+	def printTree(arg: Any) = macro printTreeImpl
+	def printTreeImpl(c: Context)(arg: c.Expr[Any]): c.Expr[String] = {
+	  val argStr = arg.tree.toString
+	  val literalStr = c.universe.Literal(c.universe.Constant(argStr))
+	  c.Expr[String](literalStr)
+	}
+}

sbt/src/sbt-test/source-dependencies/macro-arg-dep-nested/project/build.scala

@@ -0,0 +1,29 @@
+import sbt._
+import Keys._
+
+object build extends Build {
+	val defaultSettings = Seq(
+		libraryDependencies <+= scalaVersion("org.scala-lang" % "scala-reflect" % _ ),
+		incOptions := incOptions.value.withNameHashing(true)
+	)
+
+	lazy val root = Project(
+	   base = file("."),
+	   id = "macro",
+	   aggregate = Seq(macroProvider, macroClient),
+	   settings = Defaults.defaultSettings ++ defaultSettings
+	)
+
+	lazy val macroProvider = Project(
+	   base = file("macro-provider"),
+	   id = "macro-provider",
+	   settings = Defaults.defaultSettings ++ defaultSettings
+	)
+
+	lazy val macroClient = Project(
+	   base = file("macro-client"),
+	   id = "macro-client",
+	   dependencies = Seq(macroProvider),
+	   settings = Defaults.defaultSettings ++ defaultSettings
+	)
+}

sbt/src/sbt-test/source-dependencies/macro-arg-dep-nested/test

@@ -0,0 +1,13 @@
+> compile
+
+# remove `Foo.str` which is an argument to a macro
+# (this macro itself that is an argument to another macro)
+$ copy-file macro-client/changes/Foo.scala macro-client/Foo.scala
+
+# we should recompile Foo.scala first and then fail to compile Client.scala due to missing
+# `Foo.str`
+-> macro-client/compile
+
+> clean
+
+-> compile

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

@@ -1,13 +1,10 @@
 > compile
 
-# remove `Foo.str` which is an argument to a macro that incremental compiler doesn't see in
-# Client.scala because macro has been already expanded
-
+# remove `Foo.str` which is an argument to a macro
 $ copy-file macro-client/changes/Foo.scala macro-client/Foo.scala
 
 # we should recompile Foo.scala first and then fail to compile Client.scala due to missing
-# `Foo.str`; however recompilation of Client.scala is never triggered due to missing
-# dependency
+# `Foo.str`
 -> macro-client/compile
 
 > clean