Add test

Author: EugeneFlesselle

tests/pos/i18654/AbstractQueryPart.java

@@ -0,0 +1,9 @@
+package org.jooq.impl;
+
+import org.jooq.Configuration;
+
+abstract class AbstractQueryPart {
+  Configuration configuration() {
+    return null;
+  }
+}

tests/pos/i18654/AbstractRoutine.java

@@ -0,0 +1,11 @@
+package org.jooq.impl;
+
+import org.jooq.Configuration;
+import org.jooq.Attachable;
+
+public abstract class AbstractRoutine<T> extends AbstractQueryPart implements Attachable {
+  @Override
+  public final Configuration configuration() {
+    return null;
+  }
+}

tests/pos/i18654/Attachable.java

@@ -0,0 +1,5 @@
+package org.jooq;
+
+public interface Attachable {
+  Configuration configuration();
+}

tests/pos/i18654/Configuration.java

@@ -0,0 +1,3 @@
+package org.jooq;
+
+public interface Configuration {}

tests/pos/i18654/MyRoutineScala.scala

@@ -0,0 +1,6 @@
+package com.example
+
+import org.jooq.impl.AbstractRoutine
+
+// Works in Scala 2.12 and 2.13 but is broken in Scala 3
+class MyRoutineScala extends AbstractRoutine[String] {}