Auto merge of #67540 - Mark-Simulacrum:fmt-the-world, r=Centril

Format the world

This PR modifies the formatting infrastructure a bit in the first commit (to enable the forgotten 2018 edition), as well as removes most directories from the ignore list in rustfmt.toml. It then follows that up with the second commit which runs `x.py fmt` and formats the entire repository.

We continue to not format the test directory (`src/test`) because of interactions with pretty printing and, in part, because re-blessing all of those files is somewhat harder to review, so is best suited for a follow up PR in my opinion.

1 files changed, 9 insertions, 7 deletions

diff --git a/src/librustc_codegen_utils/codegen_backend.rs b/src/librustc_codegen_utils/codegen_backend.rs
index 0e2c3731eae..0737fd6b5ca 100644
--- a/src/librustc_codegen_utils/codegen_backend.rs
+++ b/src/librustc_codegen_utils/codegen_backend.rs
@@ -8,21 +8,23 @@
 
 use std::any::Any;
 
-use syntax::symbol::Symbol;
-use rustc::session::Session;
-use rustc::util::common::ErrorReported;
+use rustc::dep_graph::DepGraph;
+use rustc::middle::cstore::{EncodedMetadata, MetadataLoaderDyn};
 use rustc::session::config::{OutputFilenames, PrintRequest};
-use rustc::ty::TyCtxt;
+use rustc::session::Session;
 use rustc::ty::query::Providers;
-use rustc::middle::cstore::{EncodedMetadata, MetadataLoaderDyn};
-use rustc::dep_graph::DepGraph;
+use rustc::ty::TyCtxt;
+use rustc::util::common::ErrorReported;
+use syntax::symbol::Symbol;
 
 pub use rustc_data_structures::sync::MetadataRef;
 
 pub trait CodegenBackend {
     fn init(&self, _sess: &Session) {}
     fn print(&self, _req: PrintRequest, _sess: &Session) {}
-    fn target_features(&self, _sess: &Session) -> Vec<Symbol> { vec![] }
+    fn target_features(&self, _sess: &Session) -> Vec<Symbol> {
+        vec![]
+    }
     fn print_passes(&self) {}
     fn print_version(&self) {}