Trait implementation among incompatible version but within same path results in confusing error

compiler traits working group
1

I have pulled serde-xml@=0.9.1, which depends on serde@^0.8. But it will solved as serde@=0.8.23 which (probably) is not considered as compatible with serde@^1.0 (modern releases).

Here is minimized example.

However, I was confused with not so good error:

log 
   Compiling serde v1.0.188
    Checking log v0.4.20
    Checking serde v0.8.23
    Checking log v0.3.9
    Checking serde_xml v0.9.1
    Checking incompatible-trait-error v0.1.0 (/home/kisaragi/IdeaProjects/incompatible-trait-error)
error[E0277]: the trait bound `Foo: serde::de::Deserialize` is not satisfied
   --> src/main.rs:4:38
    |
4   |     assert_eq!(serde_xml::from_str::<Foo>("<x>12345</x>").unwrap().x, 12345);
    |                                      ^^^ the trait `serde::de::Deserialize` is not implemented for `Foo`
    |
    = help: the following other types implement trait `serde::de::Deserialize`:
              bool
              char
              isize
              i8
              i16
              i32
              i64
              usize
            and 85 others
note: required by a bound in `serde_xml::from_str`
   --> /home/kisaragi/.cargo/registry/src/index.crates.io-6f17d22bba15001f/serde_xml-0.9.1/src/de/mod.rs:887:14
    |
886 | pub fn from_str<T>(s: &str) -> Result<T, Error>
    |        -------- required by a bound in this function
887 |     where T: de::Deserialize,
    |              ^^^^^^^^^^^^^^^ required by this bound in `from_str`

For more information about this error, try `rustc --explain E0277`.
error: could not compile `incompatible-trait-error` (bin "incompatible-trait-error") due to previous error

I have found prior topic and issue, but they're not so active.

I have avoided this issue with serde-xml-rs, but is there any progress around there?

2

The issue you linked is where any updates would be.