[Completion] No proposals while trying to generate a stub main method

```
public class X {
// As of Java 21
record R(int i) {
public int i() { // bad (but legal) accessor method for i
return i / 0;
}
}

static void exampleAnR(R r) {
switch(r) {
case R(var i): System.out.println(i);
}
}

main| // <<-------------------------- Completion here brings up nothing.

}
```