Graduated warning is not triggered when migrating

Author: som-snytt

compiler/src/dotty/tools/dotc/report.scala

@@ -74,7 +74,7 @@ object report:
 
   def gradualErrorOrMigrationWarning(msg: Message, pos: SrcPos = NoSourcePosition, warnFrom: SourceVersion, errorFrom: SourceVersion)(using Context): Unit =
     if sourceVersion.isAtLeast(errorFrom) then errorOrMigrationWarning(msg, pos, errorFrom)
-    else if sourceVersion.isAtLeast(warnFrom) then warning(msg, pos)
+    else if sourceVersion.ordinal >= warnFrom.ordinal then warning(msg, pos)
 
   def restrictionError(msg: Message, pos: SrcPos = NoSourcePosition)(using Context): Unit =
     error(msg.mapMsg("Implementation restriction: " + _), pos)