Merge pull request scala#3282 from retronym/ticket/8085

 Fix BrowserTraverser for package objects

Author: adriaanm

src/compiler/scala/tools/nsc/symtab/BrowsingLoaders.scala

@@ -64,8 +64,10 @@ abstract class BrowsingLoaders extends SymbolLoaders {
           addPackagePrefix(pre)
           packagePrefix += ("." + name)
         case Ident(name) =>
-          if (packagePrefix.length != 0) packagePrefix += "."
-          packagePrefix += name
+          if (name != nme.EMPTY_PACKAGE_NAME) { // mirrors logic in Namers, see createPackageSymbol
+            if (packagePrefix.length != 0) packagePrefix += "."
+            packagePrefix += name
+          }
         case _ =>
           throw new MalformedInput(pkg.pos.point, "illegal tree node in package prefix: "+pkg)
       }

test/files/presentation/t8085.check

@@ -0,0 +1,3 @@
+reload: NodeScalaSuite.scala
+open package module: package nodescala
+Test OK

test/files/presentation/t8085.flags

@@ -0,0 +1 @@
+-sourcepath src

test/files/presentation/t8085/Test.scala

@@ -0,0 +1,27 @@
+import scala.tools.nsc.interactive.tests.InteractiveTest
+import scala.reflect.internal.util.SourceFile
+import scala.tools.nsc.interactive.Response
+
+object Test extends InteractiveTest {
+
+  override def execute(): Unit = {
+    val src = loadSourceAndWaitUntilTypechecked("NodeScalaSuite.scala")
+    checkErrors(src)
+  }
+
+  private def loadSourceAndWaitUntilTypechecked(sourceName: String): SourceFile = {
+    val sourceFile = sourceFiles.find(_.file.name == sourceName).head
+    askReload(List(sourceFile)).get
+    askLoadedTyped(sourceFile).get
+    sourceFile
+  }
+
+  private def checkErrors(source: SourceFile): Unit = compiler.getUnitOf(source) match {
+    case Some(unit) =>
+      val problems = unit.problems.toList
+      if(problems.isEmpty) reporter.println("Test OK")
+      else problems.foreach(problem => reporter.println(problem.msg))
+
+    case None => reporter.println("No compilation unit found for " + source.file.name)
+  }
+}

test/files/presentation/t8085/src/nodescala/Foo.scala

@@ -0,0 +1,3 @@
+package nodescala
+
+class Foo

test/files/presentation/t8085/src/nodescala/NodeScalaSuite.scala

@@ -0,0 +1,10 @@
+package nodescala
+
+class NodeScalaSuite {
+  "".rich
+
+  // This is here only to prove that the presentation compiler is instantiated with the
+  // correct `sourcepath` value (if it wasn't, you would see a `not found: type Foo` in
+  // the test's output
+  println(new Foo())
+}

test/files/presentation/t8085/src/nodescala/package.scala

@@ -0,0 +1,7 @@
+import scala.Some // <-- if you move the import *inside* the package object, then it all works fine!!
+
+package object nodescala {
+  implicit class StringOps(val f: String) {
+    def rich = 0
+  }
+}

test/files/presentation/t8085b.check

@@ -0,0 +1,3 @@
+reload: NodeScalaSuite.scala
+open package module: package nodescala
+Test OK

test/files/presentation/t8085b.flags

@@ -0,0 +1 @@
+-sourcepath src

test/files/presentation/t8085b/Test.scala

@@ -0,0 +1,27 @@
+import scala.tools.nsc.interactive.tests.InteractiveTest
+import scala.reflect.internal.util.SourceFile
+import scala.tools.nsc.interactive.Response
+
+object Test extends InteractiveTest {
+
+  override def execute(): Unit = {
+    val src = loadSourceAndWaitUntilTypechecked("NodeScalaSuite.scala")
+    checkErrors(src)
+  }
+
+  private def loadSourceAndWaitUntilTypechecked(sourceName: String): SourceFile = {
+    val sourceFile = sourceFiles.find(_.file.name == sourceName).head
+    askReload(List(sourceFile)).get
+    askLoadedTyped(sourceFile).get
+    sourceFile
+  }
+
+  private def checkErrors(source: SourceFile): Unit = compiler.getUnitOf(source) match {
+    case Some(unit) =>
+      val problems = unit.problems.toList
+      if(problems.isEmpty) reporter.println("Test OK")
+      else problems.foreach(problem => reporter.println(problem.msg))
+
+    case None => reporter.println("No compilation unit found for " + source.file.name)
+  }
+}