Deserializing struct enum from inline table works with from_str but not from toml::Value

[mehmetalianil]

I was trying to have a workaround against nested enums, and ended up with this idea of parsing a toml, but leaving parts of it that are nested as toml::Value, to be parsed (or converted with try_into()) to the enum of my choice.

I realized that an inline table enum { KeepLast = { depth = 3 }} is successfully parsed with from_str but not when it is first deserialized into a toml::Value, and then parsed.

https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=c3ed207a481ed3cac8aca7a56458f0fa

Keener eyes then mine in the Matrix room #rust:matrix.org have chipped in as:

The problem is that deserializing an enum from TOML text works differently than deserializing an enum from a Value.

text: https://docs.rs/toml/0.5.9/src/toml/de.rs.html#247-291
Value: https://docs.rs/toml/0.5.9/src/toml/value.rs.html#584-600

The text Deserializer allows both uninhabited enums (represented as a TOML string) and inhabited enums (represented as a table with one element), while the Value Deserializer only allows uninhabited enums. Worth opening an issue about, imo.

[axos88]

Related (sill wip): #473

[epage]

Maintenance of this crate has moved to the https://github.com/toml-rs/toml repo. As a heads up, we plan to move toml to be on top of toml_edit, see toml-rs/toml#340.

Closing this out. If this is still a problem, feel free to recreate this issue in the new repo.