1 files changed, 23 insertions, 0 deletions
diff --git a/tests/untried/neg-with-implicits/macro-divergence-controlled/Impls_Macros_1.scala b/tests/untried/neg-with-implicits/macro-divergence-controlled/Impls_Macros_1.scala
new file mode 100644
index 000000000..5c0450326
--- /dev/null
+++ b/tests/untried/neg-with-implicits/macro-divergence-controlled/Impls_Macros_1.scala
@@ -0,0 +1,23 @@
+import scala.reflect.macros.whitebox.Context
+import language.experimental.macros
+
+trait Complex[T]
+
+class Foo(val foo: Foo)
+
+object Complex {
+  def impl[T: c.WeakTypeTag](c: Context): c.Expr[Complex[T]] = {
+    import c.universe._
+    val tpe = weakTypeOf[T]
+    for (f <- tpe.decls.collect{case f: TermSymbol if f.isParamAccessor && !f.isMethod => f}) {
+      val trecur = appliedType(typeOf[Complex[_]], List(f.info))
+      if (c.openImplicits.tail.exists(ic => ic.pt =:= trecur)) c.abort(c.enclosingPosition, "diverging implicit expansion. reported by a macro!")
+      val recur = c.inferImplicitValue(trecur, silent = true)
+      if (recur == EmptyTree) c.abort(c.enclosingPosition, s"couldn't synthesize $trecur")
+    }
+    c.Expr[Null](q"null")
+  }
+
+  implicit object ComplexString extends Complex[String]
+  implicit def genComplex[T]: Complex[T] = macro impl[T]
+}