Macros support

[frol]

It seems that something is going wrong with the macros. Here is what I put in a single Jupyter cell:

#[macro_use]
extern crate serde_derive;

extern crate serde;
extern crate serde_json;

#[derive(Serialize, Deserialize, Debug)]
pub struct Point {
    pub x: i32,
    pub y: i32,
}

Output:

#[derive(Serialize, Deserialize, Debug)]
                    ^^^^^^^^^^^ 
cannot find derive macro `Deserialize` in this scope

#[derive(Serialize, Deserialize, Debug)]
         ^^^^^^^^^ 
cannot find derive macro `Serialize` in this scope

[frol]

Well, this might be not a big deal since extern crate and macro_use will essentially go away in Rust 2018 edition. I successfully run Rust Beta (1.30) and use use statement to import macros:

$ rustup run beta evcxr
Welcome to evcxr. For help, type :help
>> extern crate serde;
>> extern crate serde_derive;
>> extern crate serde_json;
>> use serde_derive::{Serialize, Deserialize};
>> #[derive(Debug, Serialize, Deserialize)] pub struct Point { pub x: i32, pub y: i32 }
>> let p1 = Point { x: 10, y: 20 };
>> p1
Point { x: 10, y: 20 }
>> serde_json::to_string(&p1)
Ok("{\"x\":10,\"y\":20}")