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Update free.rs
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@ -47,7 +47,7 @@ pub trait HasLevel {
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}
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fn lift(&self) {
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if let Some(lev) = self.level() {
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self.set_level(lev + 1);
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self.set_level(lev.saturating_add(1));
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}
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}
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fn generalize(&self) {
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