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, 4 insertions, 6 deletions

diff --git a/src/liballoc/tests/binary_heap.rs b/src/liballoc/tests/binary_heap.rs
index a896a1064d9..f49ca713921 100644
--- a/src/liballoc/tests/binary_heap.rs
+++ b/src/liballoc/tests/binary_heap.rs
@@ -1,5 +1,5 @@
-use std::collections::BinaryHeap;
 use std::collections::binary_heap::{Drain, PeekMut};
+use std::collections::BinaryHeap;
 use std::iter::TrustedLen;
 
 #[test]
@@ -349,10 +349,10 @@ fn assert_covariance() {
 #[test]
 #[cfg(not(target_os = "emscripten"))]
 fn panic_safe() {
+    use rand::{seq::SliceRandom, thread_rng};
     use std::cmp;
     use std::panic::{self, AssertUnwindSafe};
     use std::sync::atomic::{AtomicUsize, Ordering};
-    use rand::{thread_rng, seq::SliceRandom};
 
     static DROP_COUNTER: AtomicUsize = AtomicUsize::new(0);
 
@@ -389,10 +389,8 @@ fn panic_safe() {
         for i in 1..=DATASZ {
             DROP_COUNTER.store(0, Ordering::SeqCst);
 
-            let mut panic_ords: Vec<_> = data.iter()
-                                             .filter(|&&x| x != i)
-                                             .map(|&x| PanicOrd(x, false))
-                                             .collect();
+            let mut panic_ords: Vec<_> =
+                data.iter().filter(|&&x| x != i).map(|&x| PanicOrd(x, false)).collect();
             let panic_item = PanicOrd(i, true);
 
             // heapify the sane items