use impossible enum type
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@ -58,7 +58,7 @@ impl<T: InitialFormat> Migrate for T {
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/// Internal type used by InitialFormat, not meant for general use.
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#[derive(Serialize, Deserialize)]
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pub struct NoPrevious;
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pub enum NoPrevious {}
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impl Migrate for NoPrevious {
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type Previous = NoPrevious;
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