Auto merge of rust-lang#103188 - JohnTitor:rollup-pwilam1, r=JohnTitor

Rollup of 6 pull requests

Successful merges:

 - rust-lang#103023 (Adding `fuchsia-ignore` and `needs-unwind` to compiler test cases)
 - rust-lang#103142 (Make diagnostic for unsatisfied `Termination` bounds more precise)
 - rust-lang#103154 (Fix typo in `ReverseSearcher` docs)
 - rust-lang#103159 (Remove the redundant `Some(try_opt!(..))` in `checked_pow`)
 - rust-lang#103163 (Remove all uses of array_assume_init)
 - rust-lang#103168 (Stabilize asm_sym)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_ast_lowering/src/asm.rs

@@ -192,16 +192,6 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                         }
                     }
                     InlineAsmOperand::Sym { ref sym } => {
-                        if !self.tcx.features().asm_sym {
-                            feature_err(
-                                &sess.parse_sess,
-                                sym::asm_sym,
-                                *op_sp,
-                                "sym operands for inline assembly are unstable",
-                            )
-                            .emit();
-                        }
-
                         let static_def_id = self
                             .resolver
                             .get_partial_res(sym.id)

compiler/rustc_codegen_gcc/tests/run/asm.rs

@@ -3,11 +3,12 @@
 // Run-time:
 //   status: 0
 
-#![feature(asm_const, asm_sym)]
+#![feature(asm_const)]
 
 use std::arch::{asm, global_asm};
 
-global_asm!("
+global_asm!(
+    "
     .global add_asm
 add_asm:
      mov rax, rdi
@@ -132,7 +133,9 @@ fn main() {
     assert_eq!(x, 43);
 
     // check sym fn
-    extern "C" fn foo() -> u64 { 42 }
+    extern "C" fn foo() -> u64 {
+        42
+    }
     let x: u64;
     unsafe {
         asm!("call {}", sym foo, lateout("rax") x);

compiler/rustc_feature/src/accepted.rs

@@ -53,6 +53,8 @@ declare_features! (
     (accepted, abi_sysv64, "1.24.0", Some(36167), None),
     /// Allows using ADX intrinsics from `core::arch::{x86, x86_64}`.
     (accepted, adx_target_feature, "1.61.0", Some(44839), None),
+    /// Allows using `sym` operands in inline assembly.
+    (accepted, asm_sym, "CURRENT_RUSTC_VERSION", Some(93333), None),
     /// Allows the definition of associated constants in `trait` or `impl` blocks.
     (accepted, associated_consts, "1.20.0", Some(29646), None),
     /// Allows using associated `type`s in `trait`s.

compiler/rustc_feature/src/active.rs

@@ -300,8 +300,6 @@ declare_features! (
     (active, asm_const, "1.58.0", Some(93332), None),
     /// Enables experimental inline assembly support for additional architectures.
     (active, asm_experimental_arch, "1.58.0", Some(93335), None),
-    /// Allows using `sym` operands in inline assembly.
-    (active, asm_sym, "1.58.0", Some(93333), None),
     /// Allows the `may_unwind` option in inline assembly.
     (active, asm_unwind, "1.58.0", Some(93334), None),
     /// Allows users to enforce equality of associated constants `TraitImpl<AssocConst=3>`.

compiler/rustc_span/src/symbol.rs

@@ -451,6 +451,7 @@ symbols! {
         call_once,
         caller_location,
         capture_disjoint_fields,
+        cause,
         cdylib,
         ceilf32,
         ceilf64,

compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs

@@ -164,6 +164,10 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
             flags.push((sym::from_desugaring, Some(format!("{:?}", k))));
         }
 
+        if let ObligationCauseCode::MainFunctionType = obligation.cause.code() {
+            flags.push((sym::cause, Some("MainFunctionType".to_string())));
+        }
+
         // Add all types without trimmed paths.
         ty::print::with_no_trimmed_paths!({
             let generics = self.tcx.generics_of(def_id);

library/alloc/src/lib.rs

@@ -125,9 +125,9 @@
 #![feature(iter_advance_by)]
 #![feature(iter_next_chunk)]
 #![feature(layout_for_ptr)]
-#![feature(maybe_uninit_array_assume_init)]
 #![feature(maybe_uninit_slice)]
 #![feature(maybe_uninit_uninit_array)]
+#![feature(maybe_uninit_uninit_array_transpose)]
 #![cfg_attr(test, feature(new_uninit))]
 #![feature(nonnull_slice_from_raw_parts)]
 #![feature(pattern)]

library/alloc/src/vec/into_iter.rs

@@ -223,7 +223,7 @@ impl<T, A: Allocator> Iterator for IntoIter<T, A> {
 
             self.ptr = self.ptr.wrapping_byte_add(N);
             // Safety: ditto
-            return Ok(unsafe { MaybeUninit::array_assume_init(raw_ary) });
+            return Ok(unsafe { raw_ary.transpose().assume_init() });
         }
 
         if len < N {
@@ -241,7 +241,7 @@ impl<T, A: Allocator> Iterator for IntoIter<T, A> {
         return unsafe {
             ptr::copy_nonoverlapping(self.ptr, raw_ary.as_mut_ptr() as *mut T, N);
             self.ptr = self.ptr.add(N);
-            Ok(MaybeUninit::array_assume_init(raw_ary))
+            Ok(raw_ary.transpose().assume_init())
         };
     }
 

library/core/src/array/iter.rs

@@ -104,8 +104,7 @@ impl<T, const N: usize> IntoIter<T, N> {
     ///
     /// ```
     /// #![feature(array_into_iter_constructors)]
-    ///
-    /// #![feature(maybe_uninit_array_assume_init)]
+    /// #![feature(maybe_uninit_uninit_array_transpose)]
     /// #![feature(maybe_uninit_uninit_array)]
     /// use std::array::IntoIter;
     /// use std::mem::MaybeUninit;
@@ -134,7 +133,7 @@ impl<T, const N: usize> IntoIter<T, N> {
     ///     }
     ///
     ///     // SAFETY: We've initialized all N items
-    ///     unsafe { Ok(MaybeUninit::array_assume_init(buffer)) }
+    ///     unsafe { Ok(buffer.transpose().assume_init()) }
     /// }
     ///
     /// let r: [_; 4] = next_chunk(&mut (10..16)).unwrap();

library/core/src/array/mod.rs

@@ -912,7 +912,7 @@ where
 
     mem::forget(guard);
     // SAFETY: All elements of the array were populated in the loop above.
-    let output = unsafe { MaybeUninit::array_assume_init(array) };
+    let output = unsafe { array.transpose().assume_init() };
     Ok(Try::from_output(output))
 }