10624: minor: revert edition change in test r=lnicola a=lnicola

Fixes https://github.com/rust-analyzer/rust-analyzer/pull/10607#discussion_r734963606

Co-authored-by: Laurențiu Nicola <lnicola@dend.ro>
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bors[bot] 2021-10-24 11:53:51 +00:00 committed by GitHub
commit 1f47693e02
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@ -350,7 +350,7 @@ fn test_format_document_2018() {
[package]
name = "foo"
version = "0.0.0"
edition = "2021"
edition = "2018"
//- /src/lib.rs
mod bar;