build.rs strange behaviour with edition 2018 #5860
Description
rust-clippy used to build fine until
rustc 1.30.0-nightly (7e8ca9f8b 2018-08-03)
cargo 1.29.0-nightly (15433e8cc 2018-08-02)
It uses edition 2018 in Cargo.toml.
When building, it seems that some imports of build.rs are no longer found.
I was able to fix that by adding extern crate .... (see rust-lang/rust-clippy#3001 ) however clippy is rust 2018 and should not need that.
So is build.rs not edition 2018 if the rest of the project is?
I was also able to have
#![feature(rust_2018_preview)]
#![warn(rust_2018_idioms)]
extern crate ....in build.rs without any warning, shouldn't it trigger some?
Clippy repo @ 8ef759e0273ad97f1acbb1ea9f94322aa2a20147