Auto merge of #86054 - JohnTitor:rollup-j40z7sm, r=JohnTitor

Rollup of 8 pull requests

Successful merges:

 - #85436 (Avoid cloning cache key)
 - #85772 (Preserve metadata w/ Solaris-like linkers.)
 - #85920 (Tweak wasm_base target spec to indicate linker is not GNU and update linker inferring logic for wasm-ld.)
 - #85930 (Update standard library for IntoIterator implementation of arrays )
 - #85972 (Rustdoc html fixes)
 - #86028 (Drop an `if let` that will always succeed)
 - #86043 (don't clone attrs)
 - #86047 (Don't fire `invalid_doc_attributes` on `extern crate` items)

Failed merges:

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

Author: bors

compiler/rustc_ast/src/tokenstream.rs

@@ -218,8 +218,7 @@ impl AttrAnnotatedTokenStream {
                 AttrAnnotatedTokenTree::Attributes(data) => {
                     let mut outer_attrs = Vec::new();
                     let mut inner_attrs = Vec::new();
-                    let attrs: Vec<_> = data.attrs.clone().into();
-                    for attr in attrs {
+                    for attr in &data.attrs {
                         match attr.style {
                             crate::AttrStyle::Outer => {
                                 assert!(
@@ -264,7 +263,7 @@ impl AttrAnnotatedTokenStream {
                                 // so we never reach this code.
 
                                 let mut builder = TokenStreamBuilder::new();
-                                for inner_attr in &inner_attrs {
+                                for inner_attr in inner_attrs {
                                     builder.push(inner_attr.tokens().to_tokenstream());
                                 }
                                 builder.push(delim_tokens.clone());

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -1199,6 +1199,8 @@ fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) {
                     || stem.ends_with("-clang")
                 {
                     LinkerFlavor::Gcc
+                } else if stem == "wasm-ld" || stem.ends_with("-wasm-ld") {
+                    LinkerFlavor::Lld(LldFlavor::Wasm)
                 } else if stem == "ld" || stem == "ld.lld" || stem.ends_with("-ld") {
                     LinkerFlavor::Ld
                 } else if stem == "link" || stem == "lld-link" {
@@ -1836,10 +1838,16 @@ fn linker_with_args<'a, B: ArchiveBuilder<'a>>(
     // Make the binary compatible with data execution prevention schemes.
     cmd.add_no_exec();
 
+    // OBJECT-FILES-YES
+    add_local_crate_metadata_objects(cmd, crate_type, codegen_results);
+
     // NO-OPT-OUT, OBJECT-FILES-NO
     // Avoid linking to dynamic libraries unless they satisfy some undefined symbols
     // at the point at which they are specified on the command line.
     // Must be passed before any dynamic libraries.
+    // On solaris-like systems, this also will ignore unreferenced ELF sections
+    // from relocatable objects. For that reason, we move the metadata objects
+    // to before this flag as they would otherwise be removed.
     cmd.add_as_needed();
 
     // NO-OPT-OUT, OBJECT-FILES-NO
@@ -1891,9 +1899,6 @@ fn linker_with_args<'a, B: ArchiveBuilder<'a>>(
     // dynamic library.
     cmd.export_symbols(tmpdir, crate_type);
 
-    // OBJECT-FILES-YES
-    add_local_crate_metadata_objects(cmd, crate_type, codegen_results);
-
     // OBJECT-FILES-YES
     add_local_crate_allocator_objects(cmd, codegen_results);
 

compiler/rustc_codegen_ssa/src/back/linker.rs

@@ -476,21 +476,23 @@ impl<'a> Linker for GccLinker<'a> {
         // eliminate the metadata. If we're building an executable, however,
         // --gc-sections drops the size of hello world from 1.8MB to 597K, a 67%
         // reduction.
-        } else if self.sess.target.linker_is_gnu && !keep_metadata {
+        } else if (self.sess.target.linker_is_gnu || self.sess.target.is_like_wasm)
+            && !keep_metadata
+        {
             self.linker_arg("--gc-sections");
         }
     }
 
     fn no_gc_sections(&mut self) {
         if self.sess.target.is_like_osx {
             self.linker_arg("-no_dead_strip");
-        } else if self.sess.target.linker_is_gnu {
+        } else if self.sess.target.linker_is_gnu || self.sess.target.is_like_wasm {
             self.linker_arg("--no-gc-sections");
         }
     }
 
     fn optimize(&mut self) {
-        if !self.sess.target.linker_is_gnu {
+        if !self.sess.target.linker_is_gnu && !self.sess.target.is_like_wasm {
             return;
         }
 

compiler/rustc_data_structures/src/obligation_forest/mod.rs

@@ -342,7 +342,7 @@ impl<O: ForestObligation> ObligationForest<O> {
             return Ok(());
         }
 
-        match self.active_cache.entry(cache_key.clone()) {
+        match self.active_cache.entry(cache_key) {
             Entry::Occupied(o) => {
                 let node = &mut self.nodes[*o.get()];
                 if let Some(parent_index) = parent {
@@ -366,8 +366,7 @@ impl<O: ForestObligation> ObligationForest<O> {
                     && self
                         .error_cache
                         .get(&obligation_tree_id)
-                        .map(|errors| errors.contains(&cache_key))
-                        .unwrap_or(false);
+                        .map_or(false, |errors| errors.contains(v.key()));
 
                 if already_failed {
                     Err(())

compiler/rustc_mir/src/transform/check_consts/validation.rs

@@ -729,13 +729,11 @@ impl Visitor<'tcx> for Validator<'mir, 'tcx> {
                 let base_ty = Place::ty_from(place_local, proj_base, self.body, self.tcx).ty;
                 if let ty::RawPtr(_) = base_ty.kind() {
                     if proj_base.is_empty() {
-                        if let (local, []) = (place_local, proj_base) {
-                            let decl = &self.body.local_decls[local];
-                            if let Some(box LocalInfo::StaticRef { def_id, .. }) = decl.local_info {
-                                let span = decl.source_info.span;
-                                self.check_static(def_id, span);
-                                return;
-                            }
+                        let decl = &self.body.local_decls[place_local];
+                        if let Some(box LocalInfo::StaticRef { def_id, .. }) = decl.local_info {
+                            let span = decl.source_info.span;
+                            self.check_static(def_id, span);
+                            return;
                         }
                     }
                     self.check_op(ops::RawPtrDeref);

compiler/rustc_passes/src/check_attr.rs

@@ -577,7 +577,7 @@ impl CheckAttrVisitor<'tcx> {
         target: Target,
         specified_inline: &mut Option<(bool, Span)>,
     ) -> bool {
-        if target == Target::Use {
+        if target == Target::Use || target == Target::ExternCrate {
             let do_inline = meta.name_or_empty() == sym::inline;
             if let Some((prev_inline, prev_span)) = *specified_inline {
                 if do_inline != prev_inline {

compiler/rustc_target/src/spec/wasm_base.rs

@@ -102,6 +102,7 @@ pub fn options() -> TargetOptions {
         // we use the LLD shipped with the Rust toolchain by default
         linker: Some("rust-lld".to_owned()),
         lld_flavor: LldFlavor::Wasm,
+        linker_is_gnu: false,
 
         pre_link_args,
 

library/alloc/benches/vec.rs

@@ -551,19 +551,13 @@ const LEN: usize = 16384;
 #[bench]
 fn bench_chain_collect(b: &mut Bencher) {
     let data = black_box([0; LEN]);
-    b.iter(|| data.iter().cloned().chain([1].iter().cloned()).collect::<Vec<_>>());
+    b.iter(|| data.iter().cloned().chain([1]).collect::<Vec<_>>());
 }
 
 #[bench]
 fn bench_chain_chain_collect(b: &mut Bencher) {
     let data = black_box([0; LEN]);
-    b.iter(|| {
-        data.iter()
-            .cloned()
-            .chain([1].iter().cloned())
-            .chain([2].iter().cloned())
-            .collect::<Vec<_>>()
-    });
+    b.iter(|| data.iter().cloned().chain([1]).chain([2]).collect::<Vec<_>>());
 }
 
 #[bench]

library/alloc/src/collections/vec_deque/pair_slices.rs

@@ -1,4 +1,3 @@
-use core::array;
 use core::cmp::{self};
 use core::mem::replace;
 
@@ -37,7 +36,7 @@ impl<'a, 'b, T> PairSlices<'a, 'b, T> {
     }
 
     pub fn remainder(self) -> impl Iterator<Item = &'b [T]> {
-        array::IntoIter::new([self.b0, self.b1])
+        IntoIterator::into_iter([self.b0, self.b1])
     }
 }
 

library/alloc/src/vec/mod.rs

@@ -921,7 +921,7 @@ impl<T, A: Allocator> Vec<T, A> {
     ///
     /// ```
     /// let mut vec = Vec::with_capacity(10);
-    /// vec.extend([1, 2, 3].iter().cloned());
+    /// vec.extend([1, 2, 3]);
     /// assert_eq!(vec.capacity(), 10);
     /// vec.shrink_to_fit();
     /// assert!(vec.capacity() >= 3);
@@ -950,7 +950,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// ```
     /// #![feature(shrink_to)]
     /// let mut vec = Vec::with_capacity(10);
-    /// vec.extend([1, 2, 3].iter().cloned());
+    /// vec.extend([1, 2, 3]);
     /// assert_eq!(vec.capacity(), 10);
     /// vec.shrink_to(4);
     /// assert!(vec.capacity() >= 4);
@@ -984,7 +984,7 @@ impl<T, A: Allocator> Vec<T, A> {
     ///
     /// ```
     /// let mut vec = Vec::with_capacity(10);
-    /// vec.extend([1, 2, 3].iter().cloned());
+    /// vec.extend([1, 2, 3]);
     ///
     /// assert_eq!(vec.capacity(), 10);
     /// let slice = vec.into_boxed_slice();
@@ -2586,7 +2586,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// ```
     /// let mut v = vec![1, 2, 3];
     /// let new = [7, 8];
-    /// let u: Vec<_> = v.splice(..2, new.iter().cloned()).collect();
+    /// let u: Vec<_> = v.splice(..2, new).collect();
     /// assert_eq!(v, &[7, 8, 3]);
     /// assert_eq!(u, &[1, 2]);
     /// ```