Warn that `#![feature(rust_2018_preview)]` is implied when the edition is set to Rust 2018.#53413

Merged

bors merged 3 commits intorust-lang:masterfrom

eddyb:featured-in-the-latest-edition

Aug 17, 2018

Commits on Aug 15, 2018

syntax: process all edition features before other features.
eddyb
committed

Commits on Aug 16, 2018

syntax: also warn about edition "umbrella" features being implied by --edition.
eddyb
committed
tests: prefer edition: directives to compile-flags:--edition.
eddyb
committed