Auto merge of #68506 - tmandry:rollup-kz9d33v, r=tmandry

Rollup of 7 pull requests

Successful merges:

 - #68424 (Suggest borrowing `Vec<NonCopy>` in for loop)
 - #68438 (Account for non-types in substs for opaque type error messages)
 - #68469 (Avoid overflow in `std::iter::Skip::count`)
 - #68473 (Enable ASan on Fuchsia)
 - #68479 (Implement `unused_parens` for block return values)
 - #68483 (Add my (@flip1995) name to .mailmap)
 - #68500 (Clear out std, not std tools)

Failed merges:

r? @ghost

Author: bors

.mailmap

@@ -211,6 +211,7 @@ Peter Liniker <peter.liniker+github@gmail.com>
 Phil Dawes <phil@phildawes.net> Phil Dawes <pdawes@drw.com>
 Philipp Brüschweiler <blei42@gmail.com> <blei42@gmail.com>
 Philipp Brüschweiler <blei42@gmail.com> <bruphili@student.ethz.ch>
+Philipp Krones <hello@philkrones.com> flip1995 <hello@philkrones.com>
 Philipp Matthias Schäfer <philipp.matthias.schaefer@posteo.de>
 Przemysław Wesołek <jest@go.art.pl> Przemek Wesołek <jest@go.art.pl>
 Rafael Ávila de Espíndola <respindola@mozilla.com> Rafael Avila de Espindola <espindola@dream.(none)>

src/bootstrap/builder.rs

@@ -874,7 +874,7 @@ impl<'a> Builder<'a> {
         //
         // Only clear out the directory if we're compiling std; otherwise, we
         // should let Cargo take care of things for us (via depdep info)
-        if !self.config.dry_run && mode == Mode::ToolStd && cmd == "build" {
+        if !self.config.dry_run && mode == Mode::Std && cmd == "build" {
             self.clear_if_dirty(&out_dir, &self.rustc(compiler));
         }
 

src/bootstrap/native.rs

@@ -659,6 +659,24 @@ fn supported_sanitizers(out_dir: &Path, target: Interned<String>) -> Vec<Sanitiz
                 });
             }
         }
+        "x86_64-fuchsia" => {
+            for s in &["asan"] {
+                result.push(SanitizerRuntime {
+                    cmake_target: format!("clang_rt.{}-x86_64", s),
+                    path: out_dir.join(&format!("build/lib/fuchsia/libclang_rt.{}-x86_64.a", s)),
+                    name: format!("librustc_rt.{}.a", s),
+                });
+            }
+        }
+        "aarch64-fuchsia" => {
+            for s in &["asan"] {
+                result.push(SanitizerRuntime {
+                    cmake_target: format!("clang_rt.{}-aarch64", s),
+                    path: out_dir.join(&format!("build/lib/fuchsia/libclang_rt.{}-aarch64.a", s)),
+                    name: format!("librustc_rt.{}.a", s),
+                });
+            }
+        }
         _ => {}
     }
     result

src/libcore/iter/adapters/mod.rs

@@ -1815,8 +1815,14 @@ where
     }
 
     #[inline]
-    fn count(self) -> usize {
-        self.iter.count().saturating_sub(self.n)
+    fn count(mut self) -> usize {
+        if self.n > 0 {
+            // nth(n) skips n+1
+            if self.iter.nth(self.n - 1).is_none() {
+                return 0;
+            }
+        }
+        self.iter.count()
     }
 
     #[inline]

src/libcore/option.rs

@@ -151,6 +151,7 @@ use crate::{
 
 /// The `Option` type. See [the module level documentation](index.html) for more.
 #[derive(Copy, PartialEq, PartialOrd, Eq, Ord, Debug, Hash)]
+#[rustc_diagnostic_item = "option_type"]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub enum Option<T> {
     /// No value

src/libcore/result.rs

@@ -242,6 +242,7 @@ use crate::ops::{self, Deref, DerefMut};
 /// [`Err`]: enum.Result.html#variant.Err
 #[derive(Copy, PartialEq, PartialOrd, Eq, Ord, Debug, Hash)]
 #[must_use = "this `Result` may be an `Err` variant, which should be handled"]
+#[rustc_diagnostic_item = "result_type"]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub enum Result<T, E> {
     /// Contains the success value

src/librustc/ty/mod.rs

@@ -2410,7 +2410,7 @@ impl<'tcx> AdtDef {
 
     #[inline]
     pub fn variant_range(&self) -> Range<VariantIdx> {
-        (VariantIdx::new(0)..VariantIdx::new(self.variants.len()))
+        VariantIdx::new(0)..VariantIdx::new(self.variants.len())
     }
 
     /// Computes the discriminant value used by a specific variant.

src/librustc/ty/sty.rs

@@ -529,7 +529,7 @@ impl<'tcx> GeneratorSubsts<'tcx> {
     pub fn variant_range(&self, def_id: DefId, tcx: TyCtxt<'tcx>) -> Range<VariantIdx> {
         // FIXME requires optimized MIR
         let num_variants = tcx.generator_layout(def_id).variant_fields.len();
-        (VariantIdx::new(0)..VariantIdx::new(num_variants))
+        VariantIdx::new(0)..VariantIdx::new(num_variants)
     }
 
     /// The discriminant for the given variant. Panics if the `variant_index` is

src/librustc_codegen_ssa/back/link.rs

@@ -777,7 +777,7 @@ fn link_sanitizer_runtime(sess: &Session, crate_type: config::CrateType, linker:
             linker.args(&["-Wl,-rpath".into(), "-Xlinker".into(), rpath.into()]);
             linker.link_dylib(Symbol::intern(&libname));
         }
-        "x86_64-unknown-linux-gnu" => {
+        "x86_64-unknown-linux-gnu" | "x86_64-fuchsia" | "aarch64-fuchsia" => {
             let filename = format!("librustc_rt.{}.a", name);
             let path = default_tlib.join(&filename);
             linker.link_whole_rlib(&path);

src/librustc_data_structures/sorted_map.rs

@@ -132,7 +132,7 @@ impl<K: Ord, V> SortedMap<K, V> {
         R: RangeBounds<K>,
     {
         let (start, end) = self.range_slice_indices(range);
-        (&self.data[start..end])
+        &self.data[start..end]
     }
 
     #[inline]