diff --git a/prototype/Doubt/Location.swift b/prototype/Doubt/Location.swift
index b1f49f395..0ee7ebea5 100644
--- a/prototype/Doubt/Location.swift
+++ b/prototype/Doubt/Location.swift
@@ -1,4 +1,11 @@
-public enum Location {
+public enum Location: Equatable {
 	/// A literal string, vs. range information.
 	case Literal(String)
 }
+
+public func == (left: Location, right: Location) -> Bool {
+	switch (left, right) {
+	case let (.Literal(s1), .Literal(s2)):
+		return s1 == s2
+	}
+}