Fix ShowTests: Make Show contravariant

OlivierBlanvillain · allanrenucci · commit 9ef1b8dc769a · 2017-12-14T15:24:38.000+01:00
diff --git a/library/src/dotty/Show.scala b/library/src/dotty/Show.scala
@@ -1,6 +1,6 @@
 package dotty
 
-trait Show[T] {
+trait Show[-T] {
   def show(t: T): String
 }
 
diff --git a/library/test/dotty/ShowTests.scala b/library/test/dotty/ShowTests.scala
@@ -58,13 +58,12 @@ class ShowTests {
   @Test def showMaps = {
     val mp = scala.collection.immutable.Map("str1" -> "val1", "str2" -> "val2")
     assertEquals("Map(\"str1\" -> \"val1\", \"str2\" -> \"val2\")", mp.show)
+    assertEquals("Map()", Map().show)
   }
 
   @Test def withoutShow = {
     case class Car(model: String, manufacturer: String, year: Int)
-
     assertEquals("Car(Mustang,Ford,1967)", Car("Mustang", "Ford", 1967).show)
-    assertEquals("Map()", Map[Nothing, Nothing]().show)
   }
 
   @Test def partialShow = {

Original file line number	Diff line number	Diff line change
`@@ -58,13 +58,12 @@ class ShowTests {`
`58`	`58`	`@Test def showMaps = {`
`59`	`59`	`val mp = scala.collection.immutable.Map("str1" -> "val1", "str2" -> "val2")`
`60`	`60`	`assertEquals("Map(\"str1\" -> \"val1\", \"str2\" -> \"val2\")", mp.show)`
	`61`	`+ assertEquals("Map()", Map().show)`
`61`	`62`	`}`
`62`	`63`
`63`	`64`	`@Test def withoutShow = {`
`64`	`65`	`case class Car(model: String, manufacturer: String, year: Int)`
`65`		`-`
`66`	`66`	`assertEquals("Car(Mustang,Ford,1967)", Car("Mustang", "Ford", 1967).show)`
`67`		`- assertEquals("Map()", Map[Nothing, Nothing]().show)`
`68`	`67`	`}`
`69`	`68`
`70`	`69`	`@Test def partialShow = {`