Merge pull request #4731 from dotty-staging/package-object

Fix printing of package object symbol

compiler/src/dotty/tools/dotc/printing/RefinedPrinter.scala

@@ -745,8 +745,12 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
         case info: ImportType => return s"import $info.expr.show"
         case _ =>
       }
-    if (sym.is(ModuleClass))
-      kindString(sym) ~~ (nameString(sym.name.stripModuleClassSuffix) + idString(sym))
+    if (sym.is(ModuleClass)) {
+      val name =
+        if (sym.isPackageObject) sym.owner.name
+        else sym.name.stripModuleClassSuffix
+      kindString(sym) ~~ (nameString(name) + idString(sym))
+    }
     else
       super.toText(sym)
   }

compiler/test/dotty/tools/dotc/printing/PrinterTests.scala

@@ -0,0 +1,27 @@
+package dotty.tools.dotc.printing
+
+import dotty.tools.DottyTest
+import dotty.tools.dotc.ast.tpd
+import dotty.tools.dotc.core.Names._
+import dotty.tools.dotc.core.Symbols._
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class PrinterTests extends DottyTest {
+  import tpd._
+
+  @Test
+  def packageObject: Unit = {
+    val source = """
+      package object foo {
+        def bar: Int = 1
+      }
+    """
+
+    checkCompile("frontend", source) { (tree, context) =>
+      implicit val ctx = context
+      val bar = tree.find(tree => tree.symbol.name == termName("bar")).get
+      assertEquals("package object foo", bar.symbol.owner.show)
+    }
+  }
+}