try_into does not work with never rust versions

[ytkimirti]

Rust newbie here. I was trying out sample code but Response::try_into throws compilers error on newer rust editions.

Reproduce

• Go to examples/simple
• Set the edition field of Cargo.toml to 2021
• Run cargo check

   Compiling dgraph-tonic v0.10.2 (/Users/kimirti/tmp/dgraph-tonic)
    Checking simple v0.1.0 (/Users/kimirti/tmp/dgraph-tonic/examples/simple)
warning: use of deprecated associated function `chrono::TimeZone::ymd`: use `with_ymd_and_hms()` instead
  --> src/main.rs:73:18
   |
73 |         dob: Utc.ymd(1980, 1, 1).and_hms(23, 0, 0),
   |                  ^^^
   |
   = note: `#[warn(deprecated)]` on by default

warning: use of deprecated associated function `chrono::Date::<Tz>::and_hms`: Use and_hms_opt() instead
  --> src/main.rs:73:34
   |
73 |         dob: Utc.ymd(1980, 1, 1).and_hms(23, 0, 0),
   |                                  ^^^^^^^

error[E0277]: the trait bound `All: From<Response>` is not satisfied
   --> src/main.rs:136:25
    |
136 |     let ppl: All = resp.try_into().expect("JSON");
    |                         ^^^^^^^^ the trait `From<Response>` is not implemented for `All`
    |
    = note: required for `Response` to implement `Into<All>`
    = note: required for `All` to implement `TryFrom<Response>`
    = note: required for `Response` to implement `TryInto<All>`

For more information about this error, try `rustc --explain E0277`.
warning: `simple` (bin "simple") generated 2 warnings
error: could not compile `simple` due to previous error; 2 warnings emitted

I couldn't really understand why this is happening. The type All implements serde::Deserialize

#[derive(Debug, Serialize, Deserialize)]
struct All {
    all: Vec<Person>,
}

And Response implements the try_into function.

impl Response {
    ///
    /// Try deserialize response JSON data into T
    ///
    pub fn try_into<'a, T>(&'a self) -> Result<T, Error>
    where
        T: de::Deserialize<'a>,
    {
        let result: T = serde_json::from_slice(&self.json)?;
        Ok(result)
    }

[selmeci]

Hi, thank you for the report, but it looks like internal Rust's compile problem.

The same problem is reported here: rust-lang/rust-analyzer#10677.

I'm going to investigate it a little more.