+pub fn remove_unused_definitions<'tcx>(body: &mut Body<'tcx>) {
+ // First, we're going to get a count of *actual* uses for every `Local`.
+ let mut used_locals = UsedLocals::new(body);
+
+ // Next, we're going to remove any `Local` with zero actual uses. When we remove those
+ // `Locals`, we're also going to subtract any uses of other `Locals` from the `used_locals`
+ // count. For example, if we removed `_2 = discriminant(_1)`, then we'll subtract one from
+ // `use_counts[_1]`. That in turn might make `_1` unused, so we loop until we hit a
+ // fixedpoint where there are no more unused locals.
+ remove_unused_definitions_helper(&mut used_locals, body);
+}
+