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David Tolnay
3c747e4585
This disallows using an old version of serde_derive against a new version of serde_core (with a rename to serde in Cargo.toml).
The serde_core crate contains Serde's trait definitions with no support for
#[derive()].
In crates that derive an implementation of Serialize or Deserialize, you
must depend on the serde crate, not serde_core.
In crates that handwrite implementations of Serde traits, or only use them as
trait bounds, depending on serde_core is permitted. But serde re-exports all
of these traits and can be used for this use case too. If in doubt, disregard
serde_core and always use serde.