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rustc 1.16.0-nightly (7821a9b 2017-01-23)
main.rs
#[macro_use] extern crate derive_error_chain;
#[macro_use] extern crate error_chain;
#[derive(Debug, error_chain)]
pub enum ErrorKind {
Msg(String),
}
fn main() {
}
Cargo.toml
[package]
name = "rust-test"
version = "0.1.0"
authors = ["Arnavion <[email protected]>"]
[dependencies]
derive-error-chain = "=0.8.0"
error-chain = "=0.8.1"
cargo build
gives:
error: `#[derive]` for custom traits is not stable enough for use. It is deprecated and will be removed in v1.15 (see issue #29644)
--> src\main.rs:4:17
|
4 | #[derive(Debug, error_chain)]
| ^^^^^^^^^^^
|
= help: add #![feature(custom_derive)] to the crate attributes to enable
error: aborting due to previous error
derive-error-chain
exports a proc macro named error_chain
. error-chain
exports a regular macro named error_chain
.
Everything's fine if the order of the extern crate
statements is reversed, or error-chain
's import does not have #[macro_use]
.
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