Rich error messages

[crazyscot]

I would like to achieve useful error messages like the crate docs suggest is possible:

error: invalid type: found string "hi", expected u16
 --> key `debug.port` in TOML file App.toml

I am using the Toml provider and calling figment.extract::<MyType>().
However in the invalid_type case, the Error seems to be generated without metadata or path:

invalid type: found float `3.14159`, expected u16
Error { tag: Tag::Default, profile: Some(Profile(Uncased { string: "default" })), metadata: None, path: [], kind: InvalidType(Float(3.14159), "u16"), prev: None }

Have I missed something? figment.find_metadata(path) is correct for the field in question.