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Chris Tate
342b770cf2
The receiver of a borrowed Map.get is read before its key. When the key's evaluation replaces the field or local that holds the map (`this.m.get(this.key())` where key() assigns this.m), the read runs on the old map, which only the statement still holds, and the borrowed value outlives it. A borrow now also requires the read itself, receiver and key included, to preserve reference edges; otherwise the read keeps its own reference. Corpus 8181 and the emission test cover a key method that replaces the field.