undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/langtools/tools/javac/lambda/MostSpecific08.java

@@ -0,0 +1,41 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8008813
+ * @summary Structural most specific fails when method reference is passed to overloaded method
+ * @compile/fail/ref=MostSpecific08.out -XDrawDiagnostics MostSpecific08.java
+ */
+class MostSpecific08 {
+
+    static class C {
+        int getInt() { return -1; }
+        Integer getInteger() { return -1; }
+    }
+
+    interface IntResult { }
+    interface ReferenceResult<X> { }
+
+    interface PrimitiveFunction {
+        int f(C c);
+    }
+
+    interface ReferenceFunction<X> {
+        X f(C c);
+    }
+
+    interface Tester {
+        IntResult apply(PrimitiveFunction p);
+        <Z> ReferenceResult<Z> apply(ReferenceFunction<Z> p);
+    }
+
+    void testMref(Tester t) {
+        IntResult pr = t.apply(C::getInt); //ok - unoverloaded mref
+        ReferenceResult<Integer> rr = t.apply(C::getInteger); //ok - unoverloaded mref
+    }
+
+    void testLambda(Tester t) {
+        IntResult pr1 = t.apply(c->c.getInt()); //ambiguous - implicit
+        IntResult pr2 = t.apply((C c)->c.getInt()); //ok
+        ReferenceResult<Integer> rr1 = t.apply(c->c.getInteger()); //ambiguous - implicit
+        ReferenceResult<Integer> rr2 = t.apply((C c)->c.getInteger()); //ok
+    }
+}