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See discussion at https://github.com/dalek-cryptography/curve25519-dalek/issues/232 , copied below:
`1.1` changed the trait bounds for `RistrettoPoint::random` and `Scalar::random`, see #222 and #219.
These changes have two benefits:
* they unlink us from the `rand` crate and make us depend only on `rand_core`;
* they allow passing both owned and borrowed RNGs.
The change was not supposed to be a breaking change, since the new bounds are strictly more general than the old ones (as every `RngCore` is an `Rng` and every `&mut RngCore` is an `RngCore`), so the new bound is satisfied in every situation where the old bound applied.
The `1.1.0-pre.0` version didn't cause problems on the crates I tested it on, but there was an unexpected problem:
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| .. | ||
| backend | ||
| constants.rs | ||
| edwards.rs | ||
| field.rs | ||
| lib.rs | ||
| macros.rs | ||
| montgomery.rs | ||
| prelude.rs | ||
| ristretto.rs | ||
| scalar.rs | ||
| traits.rs | ||
| window.rs | ||