Auto merge of rust-lang#94103 - matthiaskrgr:rollup-cd70ofn, r=matthi…

…askrgr

Rollup of 9 pull requests

Successful merges:

 - rust-lang#93337 (Update tracking issue numbers for inline assembly sub-features)
 - rust-lang#93758 (Improve comments about type folding/visiting.)
 - rust-lang#93780 (Generate list instead of div items in sidebar)
 - rust-lang#93976 (Add MAIN_SEPARATOR_STR)
 - rust-lang#94011 (Even more let_else adoptions)
 - rust-lang#94041 (Add a `try_collect()` helper method to `Iterator`)
 - rust-lang#94043 (Fix ICE when using Box<T, A> with pointer sized A)
 - rust-lang#94082 (Remove CFG_PLATFORM)
 - rust-lang#94085 (Clippy: Don't lint `needless_borrow` in method receiver positions)

Failed merges:

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

compiler/rustc_borrowck/src/diagnostics/bound_region_errors.rs

@@ -142,11 +142,9 @@ trait TypeOpInfo<'tcx> {
         let tcx = mbcx.infcx.tcx;
         let base_universe = self.base_universe();
 
-        let adjusted_universe = if let Some(adjusted) =
+        let Some(adjusted_universe) =
             placeholder.universe.as_u32().checked_sub(base_universe.as_u32())
-        {
-            adjusted
-        } else {
+        else {
             mbcx.buffer_error(self.fallback_error(tcx, cause.span));
             return;
         };

compiler/rustc_borrowck/src/diagnostics/mod.rs

@@ -867,15 +867,14 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             kind: TerminatorKind::Call { fn_span, from_hir_call, .. }, ..
         }) = &self.body[location.block].terminator
         {
-            let (method_did, method_substs) = if let Some(info) =
+            let Some((method_did, method_substs)) =
                 rustc_const_eval::util::find_self_call(
                     self.infcx.tcx,
                     &self.body,
                     target_temp,
                     location.block,
-                ) {
-                info
-            } else {
+                )
+            else {
                 return normal_ret;
             };
 

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -639,11 +639,9 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
         let hir_map = self.infcx.tcx.hir();
         let my_def = self.body.source.def_id();
         let my_hir = hir_map.local_def_id_to_hir_id(my_def.as_local().unwrap());
-        let td = if let Some(a) =
+        let Some(td) =
             self.infcx.tcx.impl_of_method(my_def).and_then(|x| self.infcx.tcx.trait_id_of_impl(x))
-        {
-            a
-        } else {
+        else {
             return (false, None);
         };
         (

compiler/rustc_builtin_macros/src/concat_bytes.rs

@@ -6,9 +6,7 @@ use rustc_expand::base::{self, DummyResult};
 
 /// Emits errors for literal expressions that are invalid inside and outside of an array.
 fn invalid_type_err(cx: &mut base::ExtCtxt<'_>, expr: &P<rustc_ast::Expr>, is_nested: bool) {
-    let lit = if let ast::ExprKind::Lit(lit) = &expr.kind {
-        lit
-    } else {
+    let ast::ExprKind::Lit(lit) = &expr.kind else {
         unreachable!();
     };
     match lit.kind {

compiler/rustc_builtin_macros/src/lib.rs

@@ -9,6 +9,7 @@
 #![feature(decl_macro)]
 #![feature(is_sorted)]
 #![feature(nll)]
+#![feature(let_else)]
 #![feature(proc_macro_internals)]
 #![feature(proc_macro_quote)]
 #![recursion_limit = "256"]

compiler/rustc_codegen_llvm/src/type_of.rs

@@ -330,7 +330,9 @@ impl<'tcx> LayoutLlvmExt<'tcx> for TyAndLayout<'tcx> {
             ty::Ref(..) | ty::RawPtr(_) => {
                 return self.field(cx, index).llvm_type(cx);
             }
-            ty::Adt(def, _) if def.is_box() => {
+            // only wide pointer boxes are handled as pointers
+            // thin pointer boxes with scalar allocators are handled by the general logic below
+            ty::Adt(def, substs) if def.is_box() && cx.layout_of(substs.type_at(1)).is_zst() => {
                 let ptr_ty = cx.tcx.mk_mut_ptr(self.ty.boxed_ty());
                 return cx.layout_of(ptr_ty).scalar_pair_element_llvm_type(cx, index, immediate);
             }

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -216,17 +216,18 @@ pub fn each_linked_rlib(
         }
         let name = &info.crate_name[&cnum];
         let used_crate_source = &info.used_crate_source[&cnum];
-        let path = if let Some((path, _)) = &used_crate_source.rlib {
-            path
-        } else if used_crate_source.rmeta.is_some() {
-            return Err(format!(
-                "could not find rlib for: `{}`, found rmeta (metadata) file",
-                name
-            ));
+        if let Some((path, _)) = &used_crate_source.rlib {
+            f(cnum, &path);
         } else {
-            return Err(format!("could not find rlib for: `{}`", name));
-        };
-        f(cnum, &path);
+            if used_crate_source.rmeta.is_some() {
+                return Err(format!(
+                    "could not find rlib for: `{}`, found rmeta (metadata) file",
+                    name
+                ));
+            } else {
+                return Err(format!("could not find rlib for: `{}`", name));
+            }
+        }
     }
     Ok(())
 }

compiler/rustc_codegen_ssa/src/back/metadata.rs

@@ -200,9 +200,7 @@ fn create_object_file(sess: &Session) -> Option<write::Object<'static>> {
 //   `SHF_EXCLUDE` flag we can set on sections in an object file to get
 //   automatically removed from the final output.
 pub fn create_rmeta_file(sess: &Session, metadata: &[u8]) -> Vec<u8> {
-    let mut file = if let Some(file) = create_object_file(sess) {
-        file
-    } else {
+    let Some(mut file) = create_object_file(sess) else {
         // This is used to handle all "other" targets. This includes targets
         // in two categories:
         //
@@ -262,9 +260,7 @@ pub fn create_compressed_metadata_file(
 ) -> Vec<u8> {
     let mut compressed = rustc_metadata::METADATA_HEADER.to_vec();
     FrameEncoder::new(&mut compressed).write_all(metadata.raw_data()).unwrap();
-    let mut file = if let Some(file) = create_object_file(sess) {
-        file
-    } else {
+    let Some(mut file) = create_object_file(sess) else {
         return compressed.to_vec();
     };
     let section = file.add_section(

compiler/rustc_feature/src/active.rs

@@ -285,13 +285,13 @@ declare_features! (
     /// Allows trait methods with arbitrary self types.
     (active, arbitrary_self_types, "1.23.0", Some(44874), None),
     /// Allows using `const` operands in inline assembly.
-    (active, asm_const, "1.58.0", Some(72016), None),
+    (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(72016), None),
+    (active, asm_experimental_arch, "1.58.0", Some(93335), None),
     /// Allows using `sym` operands in inline assembly.
-    (active, asm_sym, "1.58.0", Some(72016), None),
+    (active, asm_sym, "1.58.0", Some(93333), None),
     /// Allows the `may_unwind` option in inline assembly.
-    (active, asm_unwind, "1.58.0", Some(72016), None),
+    (active, asm_unwind, "1.58.0", Some(93334), None),
     /// Allows users to enforce equality of associated constants `TraitImpl<AssocConst=3>`.
     (active, associated_const_equality, "1.58.0", Some(92827), None),
     /// Allows the user of associated type bounds.

compiler/rustc_index/src/bit_set.rs

@@ -852,11 +852,7 @@ impl<T: Idx> HybridBitSet<T> {
             Bound::Excluded(end) => end.index(),
             Bound::Unbounded => self.domain_size() - 1,
         };
-        let len = if let Some(l) = end.checked_sub(start) {
-            l
-        } else {
-            return;
-        };
+        let Some(len) = end.checked_sub(start) else { return };
         match self {
             HybridBitSet::Sparse(sparse) if sparse.len() + len < SPARSE_MAX => {
                 // The set is sparse and has space for `elems`.

compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs

@@ -553,8 +553,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         let ty_msg = match (local_visitor.found_node_ty, local_visitor.found_exact_method_call) {
             (_, Some(_)) => String::new(),
             (Some(ty), _) if ty.is_closure() => {
-                let substs =
-                    if let ty::Closure(_, substs) = *ty.kind() { substs } else { unreachable!() };
+                let ty::Closure(_, substs) = *ty.kind() else { unreachable!() };
                 let fn_sig = substs.as_closure().sig();
                 let args = closure_args(&fn_sig);
                 let ret = fn_sig.output().skip_binder().to_string();
@@ -597,8 +596,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         let param_type = arg_data.kind.descr();
         let suffix = match local_visitor.found_node_ty {
             Some(ty) if ty.is_closure() => {
-                let substs =
-                    if let ty::Closure(_, substs) = *ty.kind() { substs } else { unreachable!() };
+                let ty::Closure(_, substs) = *ty.kind() else { unreachable!() };
                 let fn_sig = substs.as_closure().sig();
                 let ret = fn_sig.output().skip_binder().to_string();
 

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -982,7 +982,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
         for local_id in hir.iter_local_def_id() {
             let def_id = local_id.to_def_id();
             let def_kind = tcx.opt_def_kind(local_id);
-            let def_kind = if let Some(def_kind) = def_kind { def_kind } else { continue };
+            let Some(def_kind) = def_kind else { continue };
             record!(self.tables.def_kind[def_id] <- match def_kind {
                 // Replace Ctor by the enclosing object to avoid leaking details in children crates.
                 DefKind::Ctor(CtorOf::Struct, _) => DefKind::Struct,

compiler/rustc_middle/src/dep_graph/mod.rs

@@ -61,7 +61,7 @@ impl rustc_query_system::dep_graph::DepKind for DepKind {
         OP: for<'a> FnOnce(TaskDepsRef<'a>),
     {
         ty::tls::with_context_opt(|icx| {
-            let icx = if let Some(icx) = icx { icx } else { return };
+            let Some(icx) = icx else { return };
             op(icx.task_deps)
         })
     }