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trait Deserializer<'a> { }
trait Deserializable {
fn deserialize_token<'a, D: Deserializer<'a>>(_: D, _: &'a str) -> Self;
}
impl<'a, T: Deserializable> Deserializable for &'a str {
//~^ ERROR type parameter `T` is not constrained
fn deserialize_token<D: Deserializer<'a>>(_x: D, _y: &'a str) -> &'a str {
}
}
fn main() {}
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