Auto merge of #67184 - tmandry:rollup-mzqxtck, r=tmandry

Rollup of 11 pull requests

Successful merges:

 - #66892 (Format libcore with rustfmt (including tests and benches))
 - #67106 (resolve: Resolve visibilities on fields with non-builtin attributes)
 - #67113 (Print the visibility in `print_variant`.)
 - #67115 (Simplify `check_decl_no_pat`.)
 - #67119 (libstd miri tests: avoid warnings)
 - #67125 (Added ExactSizeIterator bound to return types)
 - #67138 (Simplify `Layout::extend_packed`)
 - #67145 (fix miri step debug printing)
 - #67149 (Do not ICE #67123)
 - #67155 (Move `Layout`s instead of binding by reference)
 - #67169 (inline some common methods on OsStr)

Failed merges:

r? @ghost

Author: bors

src/liballoc/alloc/tests.rs

@@ -22,7 +22,7 @@ fn allocate_zeroed() {
 }
 
 #[bench]
-#[cfg(not(miri))] // Miri does not support benchmarks
+#[cfg_attr(miri, ignore)] // Miri does not support benchmarks
 fn alloc_owned_small(b: &mut Bencher) {
     b.iter(|| {
         let _: Box<_> = box 10;

src/liballoc/collections/linked_list/tests.rs

@@ -182,7 +182,7 @@ fn test_insert_prev() {
 
 #[test]
 #[cfg_attr(target_os = "emscripten", ignore)]
-#[cfg(not(miri))] // Miri does not support threads
+#[cfg_attr(miri, ignore)] // Miri does not support threads
 fn test_send() {
     let n = list_from(&[1, 2, 3]);
     thread::spawn(move || {

src/liballoc/collections/vec_deque/tests.rs

@@ -3,7 +3,7 @@ use super::*;
 use ::test;
 
 #[bench]
-#[cfg(not(miri))] // Miri does not support benchmarks
+#[cfg_attr(miri, ignore)] // Miri does not support benchmarks
 fn bench_push_back_100(b: &mut test::Bencher) {
     let mut deq = VecDeque::with_capacity(101);
     b.iter(|| {
@@ -16,7 +16,7 @@ fn bench_push_back_100(b: &mut test::Bencher) {
 }
 
 #[bench]
-#[cfg(not(miri))] // Miri does not support benchmarks
+#[cfg_attr(miri, ignore)] // Miri does not support benchmarks
 fn bench_push_front_100(b: &mut test::Bencher) {
     let mut deq = VecDeque::with_capacity(101);
     b.iter(|| {
@@ -29,7 +29,7 @@ fn bench_push_front_100(b: &mut test::Bencher) {
 }
 
 #[bench]
-#[cfg(not(miri))] // Miri does not support benchmarks
+#[cfg_attr(miri, ignore)] // Miri does not support benchmarks
 fn bench_pop_back_100(b: &mut test::Bencher) {
     let mut deq = VecDeque::<i32>::with_capacity(101);
 
@@ -43,7 +43,7 @@ fn bench_pop_back_100(b: &mut test::Bencher) {
 }
 
 #[bench]
-#[cfg(not(miri))] // Miri does not support benchmarks
+#[cfg_attr(miri, ignore)] // Miri does not support benchmarks
 fn bench_pop_front_100(b: &mut test::Bencher) {
     let mut deq = VecDeque::<i32>::with_capacity(101);
 

src/liballoc/sync/tests.rs

@@ -29,7 +29,7 @@ impl Drop for Canary {
 
 #[test]
 #[cfg_attr(target_os = "emscripten", ignore)]
-#[cfg(not(miri))] // Miri does not support threads
+#[cfg_attr(miri, ignore)] // Miri does not support threads
 fn manually_share_arc() {
     let v = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
     let arc_v = Arc::new(v);
@@ -334,7 +334,7 @@ fn test_ptr_eq() {
 
 #[test]
 #[cfg_attr(target_os = "emscripten", ignore)]
-#[cfg(not(miri))] // Miri does not support threads
+#[cfg_attr(miri, ignore)] // Miri does not support threads
 fn test_weak_count_locked() {
     let mut a = Arc::new(atomic::AtomicBool::new(false));
     let a2 = a.clone();

src/liballoc/tests/slice.rs

@@ -388,7 +388,7 @@ fn test_reverse() {
 }
 
 #[test]
-#[cfg(not(miri))] // Miri is too slow
+#[cfg_attr(miri, ignore)] // Miri is too slow
 fn test_sort() {
     let mut rng = thread_rng();
 
@@ -1610,7 +1610,7 @@ fn panic_safe() {
     let moduli = &[5, 20, 50];
 
     #[cfg(miri)]
-    let lens = (1..13);
+    let lens = 1..13;
     #[cfg(miri)]
     let moduli = &[10];
 

src/liballoc/tests/str.rs

@@ -166,7 +166,7 @@ fn test_join_for_different_lengths_with_long_separator() {
 }
 
 #[test]
-#[cfg(not(miri))] // Miri is too slow
+#[cfg_attr(miri, ignore)] // Miri is too slow
 fn test_unsafe_slice() {
     assert_eq!("ab", unsafe {"abc".get_unchecked(0..2)});
     assert_eq!("bc", unsafe {"abc".get_unchecked(1..3)});
@@ -483,8 +483,8 @@ mod slice_index {
     }
 
     #[test]
-    #[cfg(not(target_os = "emscripten"))] // hits an OOM
-    #[cfg(not(miri))] // Miri is too slow
+    #[cfg_attr(target_os = "emscripten", ignore)] // hits an OOM
+    #[cfg_attr(miri, ignore)] // Miri is too slow
     fn simple_big() {
         fn a_million_letter_x() -> String {
             let mut i = 0;
@@ -1069,7 +1069,7 @@ fn test_rev_iterator() {
 }
 
 #[test]
-#[cfg(not(miri))] // Miri is too slow
+#[cfg_attr(miri, ignore)] // Miri is too slow
 fn test_chars_decoding() {
     let mut bytes = [0; 4];
     for c in (0..0x110000).filter_map(std::char::from_u32) {
@@ -1081,7 +1081,7 @@ fn test_chars_decoding() {
 }
 
 #[test]
-#[cfg(not(miri))] // Miri is too slow
+#[cfg_attr(miri, ignore)] // Miri is too slow
 fn test_chars_rev_decoding() {
     let mut bytes = [0; 4];
     for c in (0..0x110000).filter_map(std::char::from_u32) {
@@ -1380,7 +1380,6 @@ fn test_bool_from_str() {
     assert_eq!("not even a boolean".parse::<bool>().ok(), None);
 }
 
-#[cfg(not(miri))] // Miri is too slow
 fn check_contains_all_substrings(s: &str) {
     assert!(s.contains(""));
     for i in 0..s.len() {
@@ -1391,7 +1390,7 @@ fn check_contains_all_substrings(s: &str) {
 }
 
 #[test]
-#[cfg(not(miri))] // Miri is too slow
+#[cfg_attr(miri, ignore)] // Miri is too slow
 fn strslice_issue_16589() {
     assert!("bananas".contains("nana"));
 
@@ -1408,7 +1407,7 @@ fn strslice_issue_16878() {
 
 
 #[test]
-#[cfg(not(miri))] // Miri is too slow
+#[cfg_attr(miri, ignore)] // Miri is too slow
 fn test_strslice_contains() {
     let x = "There are moments, Jeeves, when one asks oneself, 'Do trousers matter?'";
     check_contains_all_substrings(x);

src/liballoc/tests/string.rs

@@ -523,7 +523,7 @@ fn test_reserve_exact() {
 }
 
 #[test]
-#[cfg(not(miri))] // Miri does not support signalling OOM
+#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
 fn test_try_reserve() {
 
     // These are the interesting cases:
@@ -601,7 +601,7 @@ fn test_try_reserve() {
 }
 
 #[test]
-#[cfg(not(miri))] // Miri does not support signalling OOM
+#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
 fn test_try_reserve_exact() {
 
     // This is exactly the same as test_try_reserve with the method changed.

src/liballoc/tests/vec.rs

@@ -1080,7 +1080,7 @@ fn test_reserve_exact() {
 }
 
 #[test]
-#[cfg(not(miri))] // Miri does not support signalling OOM
+#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
 fn test_try_reserve() {
 
     // These are the interesting cases:
@@ -1183,7 +1183,7 @@ fn test_try_reserve() {
 }
 
 #[test]
-#[cfg(not(miri))] // Miri does not support signalling OOM
+#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
 fn test_try_reserve_exact() {
 
     // This is exactly the same as test_try_reserve with the method changed.

src/liballoc/tests/vec_deque.rs

@@ -1100,7 +1100,7 @@ fn test_reserve_exact_2() {
 }
 
 #[test]
-#[cfg(not(miri))] // Miri does not support signalling OOM
+#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
 fn test_try_reserve() {
     // These are the interesting cases:
     // * exactly isize::MAX should never trigger a CapacityOverflow (can be OOM)
@@ -1214,7 +1214,7 @@ fn test_try_reserve() {
 }
 
 #[test]
-#[cfg(not(miri))] // Miri does not support signalling OOM
+#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
 fn test_try_reserve_exact() {
     // This is exactly the same as test_try_reserve with the method changed.
     // See that test for comments.

src/libcore/alloc.rs

@@ -310,8 +310,7 @@ impl Layout {
     pub fn extend_packed(&self, next: Self) -> Result<Self, LayoutErr> {
         let new_size = self.size().checked_add(next.size())
             .ok_or(LayoutErr { private: () })?;
-        let layout = Layout::from_size_align(new_size, self.align())?;
-        Ok(layout)
+        Layout::from_size_align(new_size, self.align())
     }
 
     /// Creates a layout describing the record for a `[T; n]`.
@@ -1143,9 +1142,9 @@ pub unsafe trait Alloc {
         where Self: Sized
     {
         match Layout::array::<T>(n) {
-            Ok(ref layout) if layout.size() > 0 => {
+            Ok(layout) if layout.size() > 0 => {
                 unsafe {
-                    self.alloc(layout.clone()).map(|p| p.cast())
+                    self.alloc(layout).map(|p| p.cast())
                 }
             }
             _ => Err(AllocErr),
@@ -1193,9 +1192,9 @@ pub unsafe trait Alloc {
         where Self: Sized
     {
         match (Layout::array::<T>(n_old), Layout::array::<T>(n_new)) {
-            (Ok(ref k_old), Ok(ref k_new)) if k_old.size() > 0 && k_new.size() > 0 => {
+            (Ok(k_old), Ok(k_new)) if k_old.size() > 0 && k_new.size() > 0 => {
                 debug_assert!(k_old.align() == k_new.align());
-                self.realloc(ptr.cast(), k_old.clone(), k_new.size()).map(NonNull::cast)
+                self.realloc(ptr.cast(), k_old, k_new.size()).map(NonNull::cast)
             }
             _ => {
                 Err(AllocErr)
@@ -1227,8 +1226,8 @@ pub unsafe trait Alloc {
         where Self: Sized
     {
         match Layout::array::<T>(n) {
-            Ok(ref k) if k.size() > 0 => {
-                Ok(self.dealloc(ptr.cast(), k.clone()))
+            Ok(k) if k.size() > 0 => {
+                Ok(self.dealloc(ptr.cast(), k))
             }
             _ => {
                 Err(AllocErr)