1 files changed, 21 insertions, 0 deletions
diff --git a/compiler/src/dotty/tools/dotc/reporting/HideNonSensicalMessages.scala b/compiler/src/dotty/tools/dotc/reporting/HideNonSensicalMessages.scala
new file mode 100644
index 000000000..ba1ab9b33
--- /dev/null
+++ b/compiler/src/dotty/tools/dotc/reporting/HideNonSensicalMessages.scala
@@ -0,0 +1,21 @@
+package dotty.tools
+package dotc
+package reporting
+
+import core.Contexts.Context
+import diagnostic.MessageContainer
+
+/**
+ * This trait implements `isHidden` so that we avoid reporting non-sensical messages.
+ */
+trait HideNonSensicalMessages extends Reporter {
+  /** Hides non-sensical messages, unless we haven't reported any error yet or
+   *  `-Yshow-suppressed-errors` is set.
+   */
+  override def isHidden(m: MessageContainer)(implicit ctx: Context): Boolean =
+    super.isHidden(m) || {
+        m.isNonSensical &&
+        hasErrors && // if there are no errors yet, report even if diagnostic is non-sensical
+        !ctx.settings.YshowSuppressedErrors.value
+    }
+}