Add test ensuring read steps via record patterns lead to type filtering

Author: smowton

java/ql/test/library-tests/flow-through-binding/Test.java

@@ -25,6 +25,31 @@ public static Object testFlowThroughBindingInstanceOf(String s, Integer i, boole
       return null;
   }
 
+  public static Object testFlowThroughSwitchStmtWrapper(Wrapper s, Wrapper i, boolean unknown) {
+    Wrapper o = unknown ? s : i;
+    switch (o) {
+      case Wrapper(Integer i2) -> { return (Object)i2; }
+      default -> { return null; }
+    }
+  }
+
+  public static Object testFlowThroughSwitchExprWrapper(Wrapper s, Wrapper i, boolean unknown) {
+    Wrapper o = unknown ? s : i;
+    Object toRet = switch (o) {
+      case Wrapper(Integer i2) -> (Object)i2;
+      default -> null;
+    };
+    return toRet;
+  }
+
+  public static Object testFlowThroughBindingInstanceOfWrapper(Wrapper s, Wrapper i, boolean unknown) {
+    Wrapper o = unknown ? s : i;
+    if (o instanceof Wrapper(Integer i2))
+      return (Object)i2;
+    else
+      return null;
+  }
+
   public static <T> T source() { return null; }
 
   public static void sink(Object o) { }
@@ -37,6 +62,14 @@ public static void test(boolean unknown, boolean unknown2) {
     sink(testFlowThroughSwitchExpr(source1, source2, unknown));
     sink(testFlowThroughBindingInstanceOf(source1, source2, unknown));
 
+    Wrapper source1Wrapper = new Wrapper((String)source());
+    Wrapper source2Wrapper = new Wrapper((Integer)source());
+    sink(testFlowThroughSwitchStmtWrapper(source1Wrapper, source2Wrapper, unknown));
+    sink(testFlowThroughSwitchExprWrapper(source1Wrapper, source2Wrapper, unknown));
+    sink(testFlowThroughBindingInstanceOfWrapper(source1Wrapper, source2Wrapper, unknown));
+
   }
 
+  record Wrapper(Object o) { }
+
 }

java/ql/test/library-tests/flow-through-binding/test.expected

@@ -1,3 +1,6 @@
-| Test.java:35:23:35:30 | source(...) | Test.java:36:10:36:61 | testFlowThroughSwitchStmt(...) |
-| Test.java:35:23:35:30 | source(...) | Test.java:37:10:37:61 | testFlowThroughSwitchExpr(...) |
-| Test.java:35:23:35:30 | source(...) | Test.java:38:10:38:68 | testFlowThroughBindingInstanceOf(...) |
+| Test.java:60:23:60:30 | source(...) | Test.java:61:10:61:61 | testFlowThroughSwitchStmt(...) |
+| Test.java:60:23:60:30 | source(...) | Test.java:62:10:62:61 | testFlowThroughSwitchExpr(...) |
+| Test.java:60:23:60:30 | source(...) | Test.java:63:10:63:68 | testFlowThroughBindingInstanceOf(...) |
+| Test.java:66:51:66:58 | source(...) | Test.java:67:10:67:82 | testFlowThroughSwitchStmtWrapper(...) |
+| Test.java:66:51:66:58 | source(...) | Test.java:68:10:68:82 | testFlowThroughSwitchExprWrapper(...) |
+| Test.java:66:51:66:58 | source(...) | Test.java:69:10:69:89 | testFlowThroughBindingInstanceOfWrapper(...) |