Rename misses a case

[amcasey]

class C {
    f1: number;
    f2: this["f1"] = this["f1"];
}

There are three occurrences of "f1": (a) in the property name, (b) in the type annotation, and (c) in the initializer.

Expected: if you rename any occurrence of "f1", all occurrences are updated.
Actual: If you rename (a), (a) & (c) are updated. If you rename (b), (b) & (c) are updated. If you rename (c), (a) & (c) are updated. This suggests that the (b) rename is acting on the string literal, rather than the property name.