Consider this code:
---
class DiagsTest {
    static void run(int i) {
        new Object() {{
            run(null);
        }};
    }
}
---

Compiling this with "1.8.0-b132" javac:
---
$ javac DiagsTest.java
error: incompatible types: <null> cannot be converted to int
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error
---