Kotlin: exclude generated code from useless parameter check

java/ql/lib/semmle/code/java/deadcode/DeadCode.qll

@@ -304,6 +304,9 @@ class RootdefCallable extends Callable {
     this.getAnAnnotation() instanceof OverrideAnnotation
     or
     this.hasModifier("override")
+    or
+    // Exclude generated callables, such as `...$default` ones extracted from Kotlin code.
+    this.isCompilerGenerated()
   }
 }
 

java/ql/test/kotlin/query-tests/UselessParameter/UselessParameter.expected

@@ -1,2 +1 @@
-| Test.kt:11:1:11:22 | p2 | The parameter 'p2' is never used. |
 | Test.kt:11:8:11:18 | a | The parameter 'a' is never used. |