Consider code like:

```
interface One {
    /**
     * {@code One obj1}
     * {@snippet lang = java:
     * // @link substring="ab" target="One#ab" :
     * obj1.ab(a()); // @link substring="a" target="#a"
     *} class comment
     */
    void start();
    int a();
    void with();
    void ab(int i);
}
```

The "a" in "ab" matches for two regexes, this creates ambiguity, which is resolved at random.

An error should be reported to inform users about this, something like "error: ambiguous link in <location>"