Add nopos-warns

Author: szymon-rd

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

@@ -776,7 +776,7 @@ trait ParallelTesting extends RunnerOrchestration { self =>
     end maybeFailureMessage
 
     def getWarnMapAndExpectedCount(files: Seq[JFile]): (HashMap[String, Integer], Int) =
-      val comment = raw"//( *)warn".r
+      val comment = raw"//( *)(nopos-)?warn".r
       val map = new HashMap[String, Integer]()
       var count = 0
       def bump(key: String): Unit =
@@ -787,8 +787,11 @@ trait ParallelTesting extends RunnerOrchestration { self =>
       files.filter(isSourceFile).foreach { file =>
         Using(Source.fromFile(file, StandardCharsets.UTF_8.name)) { source =>
           source.getLines.zipWithIndex.foreach { case (line, lineNbr) =>
-            comment.findAllMatchIn(line).foreach { _ =>
-              bump(s"${file.getPath}:${lineNbr+1}")
+            comment.findAllMatchIn(line).foreach { m =>
+              m.group(2) match
+                case "nopos-" =>
+                  bump("nopos")
+                case _ => bump(s"${file.getPath}:${lineNbr+1}")
             }
           }
         }.get
@@ -809,8 +812,7 @@ trait ParallelTesting extends RunnerOrchestration { self =>
           val key = s"${relativize(srcpos.source.file.toString())}:${srcpos.line + 1}"
           if !seenAt(key) then unexpected += key
         else
-          unpositioned += relativize(srcpos.source.file.toString())
-
+          if(!seenAt("nopos")) unpositioned += relativize(srcpos.source.file.toString())
       reporterWarnings.foreach(sawDiagnostic)
 
       (map.asScala.keys.toList, (unexpected ++ unpositioned).toList)

tests/warn/i13440.check

@@ -2,10 +2,12 @@
 5 |def given = 42 // warn
   |    ^
   |    given is now a keyword, write `given` instead of given to keep it as an identifier
+  |    This can be rewritten automatically under -rewrite -source 3.0-migration.
 -- Migration Warning: tests/warn/i13440.scala:7:13 ---------------------------------------------------------------------
 7 |case class C(enum: List[Int] = Nil) { // warn
   |             ^
   |             enum is now a keyword, write `enum` instead of enum to keep it as an identifier
+  |             This can be rewritten automatically under -rewrite -source 3.0-migration.
 -- Migration Warning: tests/warn/i13440.scala:8:11 ---------------------------------------------------------------------
 8 |  val s = s"$enum" // warn
   |           ^