[Bug] de::from_str has overly strict generic restrictions.

[Embers-of-the-Fire]

Summary

Currently, toml::de::from_str has a signature like this:

pub fn from_str<T>(s: &'_ str) -> Result<T, Error>
where
    T: serde::de::DeserializeOwned, // note this
{
    T::deserialize(Deserializer::new(s))
}

Based on both serde's suggestion and the actual method implementation, this should not be DeserializeOwned. This issue has limited impact in practical use, but for some generic implementations may lead to more complex signatures and thus cascading contagion.

Solution

Simply change the DeserializeOwned into Deserialize<'de>.

[epage]

Closing as this is a duplicate of #490