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Previously, an entity would be discarded if it had any location in a changed file. This caused issues for entities with multiple declaration entries, such as extern variables declared in one file and defined in another. For example, given: // a.c (changed) // b.c (unchanged) extern int x; int x; The variable `x` should be preserved because it has a location in the unchanged file b.c, even though it also has a location in the changed file a.c.