Code quality improvements + add dedicated DeadRefTypes test

java/ql/test/kotlin/library-tests/reflection/reflection.ql

@@ -87,4 +87,4 @@ query predicate modifiers(ClassInstanceExpr e, Method m, string modifier) {
   m.hasModifier(modifier)
 }
 
-query predicate compGenerated(Top t, int i) { compiler_generated(t, i) }
+query predicate compGenerated(Element e, int i) { compiler_generated(e, i) }

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

@@ -0,0 +1 @@
+| test.kt:1:1:1:20 | C1 | Unused class: C1 is not referenced within this codebase. If not used as an external API it should be removed. |

java/ql/test/kotlin/query-tests/DeadRefTypes/DeadRefTypes.qlref

@@ -0,0 +1 @@
+Violations of Best Practice/Dead Code/DeadRefTypes.ql

java/ql/test/kotlin/query-tests/DeadRefTypes/test.kt

@@ -0,0 +1,15 @@
+private class C1 { }
+
+private class C2 { }
+
+fun fn() {
+    val c = C2()
+}
+
+fun fn1() = 5
+
+fun fn2(f: () -> Unit) = f()
+
+fun adapted() {
+    fn2(::fn1)
+}