Update tests relying on checkCompile returning Unit

Author: felixmulder

compiler/test/dotty/tools/dotc/ast/DesugarTests.scala

@@ -23,7 +23,7 @@ class DesugarTests extends DottyTest {
       )
   }
 
-  @Test def caseClassHasCorrectMembers =
+  @Test def caseClassHasCorrectMembers: Unit =
     checkCompile("frontend", "case class Foo(x: Int, y: String)") { (tree, context) =>
       implicit val ctx = context
       val ccTree = tree.find(tree => tree.symbol.name == typeName("Foo")).get
@@ -38,7 +38,7 @@ class DesugarTests extends DottyTest {
       rest.foreach(validSym)
     }
 
-  @Test def caseClassCompanionHasCorrectMembers =
+  @Test def caseClassCompanionHasCorrectMembers: Unit =
     checkCompile("frontend", "case class Foo(x: Int, y: String)") { (tree, context) =>
       implicit val ctx = context
       val ccTree = tree.find(tree => tree.symbol.name == termName("Foo")).get

compiler/test/dotty/tools/dotc/ast/TreeInfoTest.scala

@@ -14,7 +14,7 @@ class TreeInfoTest extends DottyTest {
   import tpd._
 
   @Test
-  def testDefPath = checkCompile("frontend", "class A { def bar = { val x = { val z = 0; 0} }} ") {
+  def testDefPath: Unit = checkCompile("frontend", "class A { def bar = { val x = { val z = 0; 0} }} ") {
     (tree, context) =>
       implicit val ctx = context
       val xTree = tree.find(tree => tree.symbol.name == termName("x")).get

compiler/test/dotty/tools/dotc/parsing/DocstringTest.scala

@@ -25,7 +25,7 @@ trait DocstringTest extends DottyTest {
       assert(false, s"Couldn't match resulting AST to expected AST in: $x")
   }
 
-  def checkFrontend(source: String)(docAssert: PartialFunction[Tree[Untyped], Unit]) = {
+  def checkFrontend(source: String)(docAssert: PartialFunction[Tree[Untyped], Unit]): Unit = {
     checkCompile("frontend", source) { (_, ctx) =>
       implicit val c: Context = ctx
       (docAssert orElse defaultAssertion)(ctx.compilationUnit.untpdTree)

compiler/test/dotty/tools/dotc/parsing/DocstringTests.scala

@@ -49,7 +49,7 @@ class DocstringTests extends DocstringTest {
         checkDocString(t.rawComment.map(_.raw), "/** Hello /* multiple open */ world! */")
     }
   }
-  @Test def multipleClassesInPackage = {
+  @Test def multipleClassesInPackage: Unit = {
     val source =
       """
       |package a

compiler/test/dotty/tools/dotc/transform/TreeTransformerTest.scala

@@ -11,7 +11,7 @@ import core.Contexts.Context
 class TreeTransformerTest extends DottyTest {
 
   @Test
-  def shouldReturnSameTreeIfUnchanged = checkCompile("frontend", "class A{ val d = 1}") {
+  def shouldReturnSameTreeIfUnchanged: Unit = checkCompile("frontend", "class A{ val d = 1}") {
     (tree, context) =>
       implicit val ctx = context
       class EmptyTransform extends MiniPhaseTransform {
@@ -31,7 +31,7 @@ class TreeTransformerTest extends DottyTest {
   }
 
   // Disabled, awaiting resolution. @Test
-  def canReplaceConstant = checkCompile("frontend", "class A{ val d = 1}") {
+  def canReplaceConstant: Unit = checkCompile("frontend", "class A{ val d = 1}") {
     (tree, context) =>
       implicit val ctx = context
       class ConstantTransform extends MiniPhaseTransform {
@@ -53,7 +53,7 @@ class TreeTransformerTest extends DottyTest {
   }
 
   @Test
-  def canOverwrite = checkCompile("frontend", "class A{ val d = 1}") {
+  def canOverwrite: Unit = checkCompile("frontend", "class A{ val d = 1}") {
     (tree, context) =>
       implicit val ctx = context
       class Transformation extends MiniPhaseTransform {
@@ -84,7 +84,7 @@ class TreeTransformerTest extends DottyTest {
   }
 
   @Test
-  def transformationOrder = checkCompile("frontend", "class A{ val d = 1}") {
+  def transformationOrder: Unit = checkCompile("frontend", "class A{ val d = 1}") {
     (tree, context) =>
       implicit val ctx = context
       class Transformation1 extends MiniPhaseTransform {
@@ -130,7 +130,7 @@ class TreeTransformerTest extends DottyTest {
   }
 
   @Test
-  def invocationCount = checkCompile("frontend", "class A{ val d = 1}") {
+  def invocationCount: Unit = checkCompile("frontend", "class A{ val d = 1}") {
     (tree, context) =>
       implicit val ctx = context
       var transformed1 = 0