cleaned up some tests

Author: reddevilmidzy

tests/ui/anon-params/anon-params-trait-method-multiple.rs

@@ -1,3 +1,4 @@
+//! regression test for <https://github.com/rust-lang/rust/issues/34074>
 //@ edition: 2015
 //@ check-pass
 // Make sure several unnamed function parameters don't conflict with each other
@@ -7,5 +8,4 @@ trait Tr {
     fn f(u8, u8) {}
 }
 
-fn main() {
-}
+fn main() {}

tests/ui/autoref-autoderef/autoderef-arc-boxed-closure-call.rs

@@ -1,9 +1,10 @@
+//! regression test for <https://github.com/rust-lang/rust/issues/21306>
 //@ run-pass
 
 use std::sync::Arc;
 
 fn main() {
     let x = 5;
-    let command = Arc::new(Box::new(|| { x*2 }));
+    let command = Arc::new(Box::new(|| x * 2));
     assert_eq!(command(), 10);
 }

tests/ui/consts/const-closure-fn-trait-object.rs

@@ -1,4 +1,5 @@
+//! regression test for <https://github.com/rust-lang/rust/issues/27268>
 //@ run-pass
 fn main() {
-    const _C: &'static dyn Fn() = &||{};
+    const _C: &'static dyn Fn() = &|| {};
 }

tests/ui/extern/extern-fn-pointer-clone-copy.rs

@@ -1,11 +1,12 @@
+//! regression test for <https://github.com/rust-lang/rust/issues/24161>
 //@ check-pass
 #![allow(dead_code)]
-#[derive(Copy,Clone)]
+#[derive(Copy, Clone)]
 struct Functions {
     a: fn(u32) -> u32,
     b: extern "C" fn(u32) -> u32,
     c: unsafe fn(u32) -> u32,
-    d: unsafe extern "C" fn(u32) -> u32
+    d: unsafe extern "C" fn(u32) -> u32,
 }
 
 pub fn main() {}

tests/ui/hashmap/hashmap-path-key.rs

@@ -1,3 +1,4 @@
+//! regression test for <https://github.com/rust-lang/rust/issues/23036>
 //@ run-pass
 
 use std::collections::HashMap;

tests/ui/inference/inference-thread-loop-closure.rs

@@ -1,13 +1,16 @@
+//! regression test for <https://github.com/rust-lang/rust/issues/20454>
 //@ check-pass
 #![allow(unused_must_use)]
 use std::thread;
 
 fn _foo() {
-    thread::spawn(move || { // no need for -> ()
+    thread::spawn(move || {
+        // no need for -> ()
         loop {
             println!("hello");
         }
-    }).join();
+    })
+    .join();
 }
 
 fn main() {}

tests/ui/inherent-impls-overlap-check/disjoint-ref-mut-method.rs

@@ -1,6 +1,6 @@
+//! regression test for <https://github.com/rust-lang/rust/issues/19097>
 //@ check-pass
 #![allow(dead_code)]
-// regression test for #19097
 
 struct Foo<T>(T);
 

tests/ui/limits/limit-huge-struct-derive-debug.rs

@@ -1,3 +1,4 @@
+//! regression test for <https://github.com/rust-lang/rust/issues/29540>
 //@ build-pass
 #[derive(Debug)]
 pub struct Config {

tests/ui/lint/unused/unused-attr-repr-packed-c-order.rs

@@ -1,3 +1,4 @@
+//! regression test for <https://github.com/rust-lang/rust/issues/26646>
 //@ check-pass
 #![deny(unused_attributes)]
 
@@ -9,4 +10,4 @@ pub struct Foo;
 #[repr(C)]
 pub struct Bar;
 
-fn main() { }
+fn main() {}

tests/ui/match/match-usize-min-max-pattern.rs

@@ -1,3 +1,4 @@
+//! regression test for <https://github.com/rust-lang/rust/issues/37686>
 //@ run-pass
 fn main() {
     match (0, 0) {