3 files changed, 72 insertions, 0 deletions
diff --git a/test/files/presentation/t7678.check b/test/files/presentation/t7678.check
new file mode 100644
index 0000000000..f06434b322
--- /dev/null
+++ b/test/files/presentation/t7678.check
@@ -0,0 +1 @@
+reload: TypeTag.scala
diff --git a/test/files/presentation/t7678/Runner.scala b/test/files/presentation/t7678/Runner.scala
new file mode 100644
index 0000000000..14d6dc2a70
--- /dev/null
+++ b/test/files/presentation/t7678/Runner.scala
@@ -0,0 +1,62 @@
+import scala.tools.nsc.interactive.tests._
+import scala.reflect.internal.util._
+
+object Test extends InteractiveTest {
+
+  import compiler._, definitions._
+
+  override def runDefaultTests() {
+    def resolveTypeTagHyperlink() {
+      val sym = compiler.askForResponse(() => compiler.currentRun.runDefinitions.TypeTagClass).get.left.get
+      val r = new Response[Position]
+      compiler.askLinkPos(sym, new BatchSourceFile("", source), r)
+      r.get
+    }
+
+    def checkTypeTagSymbolConsistent() {
+      compiler.askForResponse {
+        () => {
+          val runDefinitions = currentRun.runDefinitions
+          import runDefinitions._
+          assert(TypeTagsClass.map(sym => getMemberClass(sym, tpnme.TypeTag)) == TypeTagClass)
+          assert(TypeTagsClass.map(sym => getMemberClass(sym, tpnme.WeakTypeTag)) == WeakTypeTagClass)
+          assert(TypeTagsClass.map(sym => getMemberModule(sym, nme.WeakTypeTag)) == WeakTypeTagModule)
+          assert(getMemberMethod(ReflectPackage, nme.materializeClassTag) == materializeClassTag)
+          assert(ReflectApiPackage.map(sym => getMemberMethod(sym, nme.materializeWeakTypeTag)) == materializeWeakTypeTag)
+          assert(ReflectApiPackage.map(sym => getMemberMethod(sym, nme.materializeTypeTag)) == materializeTypeTag)
+          ()
+        }
+      }.get match {
+        case Right(t) => t.printStackTrace
+        case Left(_) =>
+      }
+    }
+    resolveTypeTagHyperlink()
+    // The presentation compiler loads TypeTags from source; we'll get new symbols for its members.
+    // Need to make sure we didn't cache the old ones in Definitions.
+    checkTypeTagSymbolConsistent()
+  }
+
+  def source =
+    """
+      |package scala
+      |package reflect
+      |package api
+      |
+      |trait TypeTags { self: Universe =>
+      |  import definitions._
+      |
+      |  @annotation.implicitNotFound(msg = "No WeakTypeTag available for ${T}")
+      |  trait WeakTypeTag[T] extends Equals with Serializable {
+      |    val mirror: Mirror
+      |    def in[U <: Universe with Singleton](otherMirror: scala.reflect.api.Mirror[U]): U # WeakTypeTag[T]
+      |    def tpe: Type
+      |  }
+      |  object WeakTypeTag
+      |
+      |  trait TypeTag[T] extends WeakTypeTag[T] with Equals with Serializable {
+      |  }
+      |  object TypeTag
+      |
+    """.stripMargin
+}
diff --git a/test/files/presentation/t7678/src/TypeTag.scala b/test/files/presentation/t7678/src/TypeTag.scala
new file mode 100644
index 0000000000..0b222f8851
--- /dev/null
+++ b/test/files/presentation/t7678/src/TypeTag.scala
@@ -0,0 +1,9 @@
+package test
+
+object Test {
+  import scala.reflect.runtime.{ universe => ru }
+  def getTypeTag(implicit tag: ru.TypeTag[Int]  ) = ()
+  locally {
+    getTypeTag/*?*/
+  }
+}