Add regression test

Author: nicolasstucki

tests/pos/scala2-macro-compat-3.scala

@@ -0,0 +1,23 @@
+
+
+object Macro1 {
+  import scala.language.experimental.macros
+  def lineNumber: Int = macro LineNumberMacro2.thisLineNumberImpl
+  inline def lineNumber: Int = 4
+}
+
+object Macro1Consume {
+  val test = Macro1.lineNumber
+}
+
+object LineNumberMacro2 {
+  class Context: // Dummy scala.reflect.macros.Context
+    type Expr[+T]
+
+  def thisLineNumberImpl(context: Context): context.Expr[Int] = {
+    // val lineNumber = context.enclosingPosition.line
+    // context.literal(lineNumber)
+    ???
+  }
+}
+