No code assist on enum value while typing a switch statement

Consider the following enum:

```java
package test40;
public enum MyEnum {
	FOO, BAR;
}
```

And the following Groovy class:

```groovy
package test40
class Test40 {
	void foo() {
		MyEnum e = MyEnum.FOO
		switch(e) {
			case MyEnum.FO|
		}
	}
}
```

Let the cursor be at "|" and invoke code assist to complete `MyEnum.FOO`: no suggestion is given.