Fix #2151: don't die for wrong number of typeargs applied

.gitignore

@@ -44,6 +44,7 @@ scala-scala
 out/
 build/
 !out/.keep
+testlogs/
 
 # Ignore build-file
 .packages

compiler/src/dotty/tools/dotc/core/Decorators.scala

@@ -103,7 +103,7 @@ object Decorators {
      *  as long as `xs`.
      */
     def zipWithConserve[U](ys: List[U])(f: (T, U) => T): List[T] =
-      if (xs.isEmpty) xs
+      if (xs.isEmpty || ys.isEmpty) Nil
       else {
         val x1 = f(xs.head, ys.head)
         val xs1 = xs.tail.zipWithConserve(ys.tail)(f)

compiler/src/dotty/tools/dotc/reporting/MessageRendering.scala

@@ -21,7 +21,7 @@ trait MessageRendering {
     * @return string stripped of ANSI escape codes
     */
   def stripColor(str: String): String =
-    str.replaceAll("\u001B\\[[;\\d]*m", "")
+    str.replaceAll("\u001b\\[.*?m", "")
 
   /** When inlining a method call, if there's an error we'd like to get the
     * outer context and the `pos` at which the call was inlined.

compiler/src/dotty/tools/dotc/util/DiffUtil.scala

@@ -58,8 +58,25 @@ object DiffUtil {
     (fnd, exp, totalChange.toDouble / (expected.length + found.length))
   }
 
-  def mkColoredCodeDiff(code: String, lastCode: String, printDiffDel: Boolean): String = {
+  def mkColoredLineDiff(expected: String, actual: String): String = {
+    val tokens = splitTokens(expected, Nil).toArray
+    val lastTokens = splitTokens(actual, Nil).toArray
+
+    val diff = hirschberg(lastTokens, tokens)
 
+    "  |SOF\n" + diff.collect {
+      case Unmodified(str) =>
+        "  |" + str
+      case Inserted(str) =>
+        ADDITION_COLOR + "e |" + str + ANSI_DEFAULT
+      case Modified(old, str) =>
+        DELETION_COLOR + "a |" + old + "\ne |" + ADDITION_COLOR + str + ANSI_DEFAULT
+      case Deleted(str) =>
+        DELETION_COLOR + "\na |" + str + ANSI_DEFAULT
+    }.mkString + "\n  |EOF"
+  }
+
+  def mkColoredCodeDiff(code: String, lastCode: String, printDiffDel: Boolean): String = {
     val tokens = splitTokens(code, Nil).toArray
     val lastTokens = splitTokens(lastCode, Nil).toArray
 

compiler/test/dotty/tools/dotc/CompilationTests.scala

@@ -12,7 +12,7 @@ import scala.util.matching.Regex
 class CompilationTests extends ParallelSummaryReport with ParallelTesting {
   import CompilationTests._
 
-  def isInteractive: Boolean = !sys.env.contains("DRONE")
+  def isInteractive: Boolean = ParallelSummaryReport.isInteractive
 
   def testFilter: Option[Regex] = sys.props.get("dotty.partest.filter").map(r => new Regex(r))
 

compiler/test/dotty/tools/dotc/ParallelSummaryReport.java

@@ -11,7 +11,9 @@
  *  this class
  */
 public class ParallelSummaryReport {
-    private static TestReporter rep = TestReporter.reporter(-1);
+    public final static boolean isInteractive = !System.getenv().containsKey("DRONE");
+
+    private static TestReporter rep = TestReporter.reporter(System.out, -1);
     private static ArrayDeque<String> failedTests = new ArrayDeque<>();
     private static ArrayDeque<String> reproduceInstructions = new ArrayDeque<>();
     private static int passed;
@@ -34,7 +36,7 @@ public final static void addReproduceInstruction(String msg) {
     }
 
     @BeforeClass public final static void setup() {
-        rep = TestReporter.reporter(-1);
+        rep = TestReporter.reporter(System.out, -1);
         failedTests = new ArrayDeque<>();
         reproduceInstructions = new ArrayDeque<>();
     }
@@ -54,14 +56,18 @@ public final static void addReproduceInstruction(String msg) {
             .map(x -> "    " + x)
             .forEach(rep::echo);
 
-        rep.flushToStdErr();
+        // If we're compiling locally, we don't need reproduce instructions
+        if (isInteractive) rep.flushToStdErr();
 
         rep.echo("");
 
         reproduceInstructions
             .stream()
             .forEach(rep::echo);
 
+        // If we're on the CI, we want everything
+        if (!isInteractive) rep.flushToStdErr();
+
         if (failed > 0) rep.flushToFile();
     }
 }

compiler/test/dotty/tools/dotc/ParallelTesting.scala

@@ -51,6 +51,16 @@ trait ParallelTesting { self =>
     def outDir: JFile
     def flags: Array[String]
 
+
+    def title: String = self match {
+      case self: JointCompilationSource =>
+        if (self.files.length > 1) name
+        else self.files.head.getPath
+
+      case self: SeparateCompilationSource =>
+        self.dir.getPath
+    }
+
     /** Adds the flags specified in `newFlags0` if they do not already exist */
     def withFlags(newFlags0: String*) = {
       val newFlags = newFlags0.toArray
@@ -69,7 +79,11 @@ trait ParallelTesting { self =>
       val maxLen = 80
       var lineLen = 0
 
-      sb.append(s"\n\nTest compiled with $errors error(s) and $warnings warning(s), the test can be reproduced by running:")
+      sb.append(
+        s"""|
+            |Test '$title' compiled with $errors error(s) and $warnings warning(s),
+            |the test can be reproduced by running:""".stripMargin
+      )
       sb.append("\n\n./bin/dotc ")
       flags.foreach { arg =>
         if (lineLen > maxLen) {
@@ -160,6 +174,8 @@ trait ParallelTesting { self =>
    *  according to the implementing class "neg", "run" or "pos".
    */
   private abstract class Test(testSources: List[TestSource], times: Int, threadLimit: Option[Int], suppressAllOutput: Boolean) {
+    protected final val realStdout = System.out
+    protected final val realStderr = System.err
 
     /** Actual compilation run logic, the test behaviour is defined here */
     protected def compilationRunnable(testSource: TestSource): Runnable
@@ -178,10 +194,10 @@ trait ParallelTesting { self =>
     val sourceCount = filteredSources.length
 
     private[this] var _errorCount =  0
-    def errorCount: Int = synchronized { _errorCount }
+    def errorCount: Int = _errorCount
 
     private[this] var _testSourcesCompiled = 0
-    private def testSourcesCompiled : Int = synchronized { _testSourcesCompiled }
+    private def testSourcesCompiled: Int = _testSourcesCompiled
 
     /** Complete the current compilation with the amount of errors encountered */
     protected final def registerCompilation(errors: Int) = synchronized {
@@ -214,7 +230,7 @@ trait ParallelTesting { self =>
 
     /** Prints to `System.err` if we're not suppressing all output */
     protected def echo(msg: String): Unit =
-      if (!suppressAllOutput) System.err.println(msg)
+      if (!suppressAllOutput) realStderr.println(msg)
 
     /** A single `Runnable` that prints a progress bar for the curent `Test` */
     private def createProgressMonitor: Runnable = new Runnable {
@@ -224,17 +240,19 @@ trait ParallelTesting { self =>
         while (tCompiled < sourceCount) {
           val timestamp = (System.currentTimeMillis - start) / 1000
           val progress = (tCompiled.toDouble / sourceCount * 40).toInt
-          print(
+
+          realStdout.print(
             "[" + ("=" * (math.max(progress - 1, 0))) +
             (if (progress > 0) ">" else "") +
             (" " * (39 - progress)) +
             s"] compiling ($tCompiled/$sourceCount, ${timestamp}s)\r"
           )
+
           Thread.sleep(100)
           tCompiled = testSourcesCompiled
         }
         // println, otherwise no newline and cursor at start of line
-        println(
+        realStdout.println(
           s"[=======================================] compiled ($sourceCount/$sourceCount, " +
           s"${(System.currentTimeMillis - start) / 1000}s)  "
         )
@@ -245,7 +263,10 @@ trait ParallelTesting { self =>
      *  if it did, the test should automatically fail.
      */
     protected def tryCompile(testSource: TestSource)(op: => Unit): Unit =
-      try op catch {
+      try {
+        if (!isInteractive) realStdout.println(s"Testing ${testSource.title}")
+        op
+      } catch {
         case NonFatal(e) => {
           // if an exception is thrown during compilation, the complete test
           // run should fail
@@ -295,8 +316,10 @@ trait ParallelTesting { self =>
         Runtime.getRuntime.exec(fullArgs).waitFor() == 0
       } else true
 
-      val reporter = TestReporter.parallelReporter(this, logLevel =
-        if (suppressErrors || suppressAllOutput) ERROR + 1 else ERROR)
+      val reporter =
+        TestReporter.reporter(realStdout, logLevel =
+          if (suppressErrors || suppressAllOutput) ERROR + 1 else ERROR)
+
       val driver =
         if (times == 1) new Driver { def newCompiler(implicit ctx: Context) = new Compiler }
         else new Driver {
@@ -339,8 +362,12 @@ trait ParallelTesting { self =>
         }
 
         pool.shutdown()
-        if (!pool.awaitTermination(10, TimeUnit.MINUTES))
+        if (!pool.awaitTermination(20, TimeUnit.MINUTES)) {
+          pool.shutdownNow()
+          System.setOut(realStdout)
+          System.setErr(realStderr)
           throw new TimeoutException("Compiling targets timed out")
+        }
 
         if (didFail) {
           reportFailed()
@@ -403,16 +430,14 @@ trait ParallelTesting { self =>
       import java.net.{ URL, URLClassLoader }
 
       val printStream = new ByteArrayOutputStream
-      val oldOut = System.out
-      val oldErr = System.err
 
       try {
         // Do classloading magic and running here:
         val ucl = new URLClassLoader(Array(dir.toURI.toURL))
         val cls = ucl.loadClass("Test")
         val meth = cls.getMethod("main", classOf[Array[String]])
 
-        self.synchronized {
+        synchronized {
           try {
             val ps = new PrintStream(printStream)
             System.setOut(ps)
@@ -422,9 +447,13 @@ trait ParallelTesting { self =>
                 meth.invoke(null, Array("jvm")) // partest passes at least "jvm" as an arg
               }
             }
-          } finally {
-            System.setOut(oldOut)
-            System.setErr(oldErr)
+            System.setOut(realStdout)
+            System.setErr(realStderr)
+          } catch {
+            case t: Throwable =>
+              System.setOut(realStdout)
+              System.setErr(realStderr)
+              throw t
           }
         }
       }
@@ -447,6 +476,7 @@ trait ParallelTesting { self =>
     private def verifyOutput(checkFile: JFile, dir: JFile, testSource: TestSource, warnings: Int) = {
       val outputLines = runMain(dir, testSource)
       val checkLines = Source.fromFile(checkFile).getLines.toArray
+      val sourceTitle = testSource.title
 
       def linesMatch =
         outputLines
@@ -456,9 +486,13 @@ trait ParallelTesting { self =>
       if (outputLines.length != checkLines.length || !linesMatch) {
         // Print diff to files and summary:
         val diff = outputLines.zip(checkLines).map { case (act, exp) =>
-          DiffUtil.mkColoredCodeDiff(exp, act, true)
+          DiffUtil.mkColoredLineDiff(exp, act)
         }.mkString("\n")
-        val msg = s"\nOutput from run test '$checkFile' did not match expected, output:\n$diff\n"
+
+        val msg =
+          s"""|Output from '$sourceTitle' did not match check file.
+              |Diff ('e' is expected, 'a' is actual):
+              |""".stripMargin + diff + "\n"
         echo(msg)
         addFailureInstruction(msg)
 

compiler/test/dotty/tools/dotc/reporting/TestReporter.scala

@@ -2,7 +2,7 @@ package dotty.tools
 package dotc
 package reporting
 
-import java.io.{ PrintWriter, File => JFile, FileOutputStream }
+import java.io.{ PrintStream, PrintWriter, File => JFile, FileOutputStream }
 import java.text.SimpleDateFormat
 import java.util.Date
 
@@ -25,10 +25,16 @@ extends Reporter with UniqueMessagePositions with HideNonSensicalMessages with M
   protected final val _messageBuf = mutable.ArrayBuffer.empty[String]
 
   final def flushToFile(): Unit =
-    _messageBuf.iterator.foreach(filePrintln)
+    _messageBuf
+      .iterator
+      .map(_.replaceAll("\u001b\\[.*?m", ""))
+      .foreach(filePrintln)
 
   final def flushToStdErr(): Unit =
-    _messageBuf.iterator.foreach(System.err.println)
+    _messageBuf
+      .iterator
+      .map(_.replaceAll("\u001b\\[.*?m", ""))
+      .foreach(System.err.println)
 
   final def inlineInfo(pos: SourcePosition): String =
     if (pos.exists) {
@@ -75,49 +81,37 @@ extends Reporter with UniqueMessagePositions with HideNonSensicalMessages with M
 }
 
 object TestReporter {
-  private[this] val logWriter = {
+  private[this] lazy val logWriter = {
     val df = new SimpleDateFormat("yyyy-MM-dd-HH:mm")
     val timestamp = df.format(new Date)
-    new PrintWriter(new FileOutputStream(new JFile(s"../tests-$timestamp.log"), true))
+    new JFile("../testlogs").mkdirs()
+    new PrintWriter(new FileOutputStream(new JFile(s"../testlogs/tests-$timestamp.log"), true))
   }
 
   def writeToLog(str: String) = {
     logWriter.println(str)
     logWriter.flush()
   }
 
-  def parallelReporter(lock: AnyRef, logLevel: Int): TestReporter = new TestReporter(
-    new PrintWriter(Console.err, true),
-    str => lock.synchronized {
-      logWriter.println(str)
-      logWriter.flush()
-    },
-    logLevel
-  )
-
-  def reporter(logLevel: Int): TestReporter = new TestReporter(
-    new PrintWriter(Console.err, true),
-    writeToLog,
-    logLevel
-  )
-
-  def simplifiedReporter(writer: PrintWriter): TestReporter = new TestReporter(
-    writer,
-    writeToLog,
-    WARNING
-  ) {
-    /** Prints the message with the given position indication in a simplified manner */
-    override def printMessageAndPos(m: MessageContainer, extra: String)(implicit ctx: Context): Unit = {
-      val msg = s"${m.pos.line + 1}: " + m.contained.kind + extra
-      val extraInfo = inlineInfo(m.pos)
-
-      writer.println(msg)
-      _messageBuf.append(msg)
-
-      if (extraInfo.nonEmpty) {
-        writer.println(extraInfo)
-        _messageBuf.append(extraInfo)
+  def reporter(ps: PrintStream, logLevel: Int): TestReporter =
+    new TestReporter(new PrintWriter(ps, true), writeToLog, logLevel)
+
+  def simplifiedReporter(writer: PrintWriter): TestReporter = {
+    val rep = new TestReporter(writer, writeToLog, WARNING) {
+      /** Prints the message with the given position indication in a simplified manner */
+      override def printMessageAndPos(m: MessageContainer, extra: String)(implicit ctx: Context): Unit = {
+        val msg = s"${m.pos.line + 1}: " + m.contained.kind + extra
+        val extraInfo = inlineInfo(m.pos)
+
+        writer.println(msg)
+        _messageBuf.append(msg)
+
+        if (extraInfo.nonEmpty) {
+          writer.println(extraInfo)
+          _messageBuf.append(extraInfo)
+        }
       }
     }
+    rep
   }
 }

tests/neg/i2151.scala

@@ -0,0 +1,6 @@
+trait Test {
+  type Nil = [K] => K
+  type StrangeCons[H, Tail <: [H, A] => H] = Tail[H, H]
+
+  def list: StrangeCons[Int, Nil] // error
+}