Auto merge of rust-lang#89683 - GuillaumeGomez:rollup-q2mjd9m, r=GuillaumeGomez

Rollup of 6 pull requests

Successful merges:

 - rust-lang#86506 (Don't normalize xform_ret_ty during method candidate assembly )
 - rust-lang#89538 (Make rustdoc not highlight `->` and `=>` as operators)
 - rust-lang#89649 (clippy::complexity fixes)
 - rust-lang#89668 (Cfg hide more conditions for core and alloc)
 - rust-lang#89669 (Remove special-casing of never primitive in rustdoc-json-types)
 - rust-lang#89672 (Remove unwrap_or! macro)

Failed merges:

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

Author: bors

compiler/rustc_ast/src/lib.rs

@@ -20,16 +20,6 @@
 #[macro_use]
 extern crate rustc_macros;
 
-#[macro_export]
-macro_rules! unwrap_or {
-    ($opt:expr, $default:expr) => {
-        match $opt {
-            Some(x) => x,
-            None => $default,
-        }
-    };
-}
-
 pub mod util {
     pub mod classify;
     pub mod comments;

compiler/rustc_ast_lowering/src/item.rs

@@ -1345,8 +1345,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
                         generics
                             .params
                             .iter()
-                            .find(|p| def_id == self.resolver.local_def_id(p.id).to_def_id())
-                            .is_some()
+                            .any(|p| def_id == self.resolver.local_def_id(p.id).to_def_id())
                     }
                     // Either the `bounded_ty` is not a plain type parameter, or
                     // it's not found in the generic type parameters list.

compiler/rustc_borrowck/src/dataflow.rs

@@ -201,7 +201,7 @@ impl<'tcx> OutOfScopePrecomputer<'_, 'tcx> {
                 let bb_data = &self.body[bb];
                 debug_assert!(hi == bb_data.statements.len());
                 for &succ_bb in bb_data.terminator().successors() {
-                    if self.visited.insert(succ_bb) == false {
+                    if !self.visited.insert(succ_bb) {
                         if succ_bb == location.block && first_lo > 0 {
                             // `succ_bb` has been seen before. If it wasn't
                             // fully processed, add its first part to `stack`

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -972,8 +972,7 @@ fn suggest_ampmut<'tcx>(
     if let Some(assignment_rhs_span) = opt_assignment_rhs_span {
         if let Ok(src) = tcx.sess.source_map().span_to_snippet(assignment_rhs_span) {
             let is_mutbl = |ty: &str| -> bool {
-                if ty.starts_with("mut") {
-                    let rest = &ty[3..];
+                if let Some(rest) = ty.strip_prefix("mut") {
                     match rest.chars().next() {
                         // e.g. `&mut x`
                         Some(c) if c.is_whitespace() => true,

compiler/rustc_builtin_macros/src/deriving/generic/mod.rs

@@ -594,7 +594,7 @@ impl<'a> TraitDef<'a> {
             GenericParamKind::Const { ty, kw_span, .. } => {
                 let const_nodefault_kind = GenericParamKind::Const {
                     ty: ty.clone(),
-                    kw_span: kw_span.clone(),
+                    kw_span: *kw_span,
 
                     // We can't have default values inside impl block
                     default: None,

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/trait_impl_difference.rs

@@ -130,8 +130,8 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
             .tcx()
             .sess
             .struct_span_err(span, &format!("`impl` associated type signature for `{}` doesn't match `trait` associated type signature", item_name));
-        err.span_label(impl_sp, &format!("found"));
-        err.span_label(trait_sp, &format!("expected"));
+        err.span_label(impl_sp, "found");
+        err.span_label(trait_sp, "expected");
 
         err.emit();
     }

compiler/rustc_lint/src/levels.rs

@@ -1,7 +1,6 @@
 use crate::context::{CheckLintNameResult, LintStore};
 use crate::late::unerased_lint_store;
 use rustc_ast as ast;
-use rustc_ast::unwrap_or;
 use rustc_ast_pretty::pprust;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder};
@@ -233,7 +232,10 @@ impl<'s> LintLevelsBuilder<'s> {
                 Some(lvl) => lvl,
             };
 
-            let mut metas = unwrap_or!(attr.meta_item_list(), continue);
+            let mut metas = match attr.meta_item_list() {
+                Some(x) => x,
+                None => continue,
+            };
 
             if metas.is_empty() {
                 // FIXME (#55112): issue unused-attributes lint for `#[level()]`

compiler/rustc_lint/src/non_fmt_panic.rs

@@ -230,8 +230,7 @@ fn check_panic_str<'tcx>(
         Err(_) => (None, None),
     };
 
-    let mut fmt_parser =
-        Parser::new(fmt.as_ref(), style, snippet.clone(), false, ParseMode::Format);
+    let mut fmt_parser = Parser::new(fmt, style, snippet.clone(), false, ParseMode::Format);
     let n_arguments = (&mut fmt_parser).filter(|a| matches!(a, Piece::NextArgument(_))).count();
 
     if n_arguments > 0 && fmt_parser.errors.is_empty() {

compiler/rustc_metadata/src/native_libs.rs

@@ -363,7 +363,7 @@ impl Collector<'tcx> {
                 .collect::<Vec<_>>();
             if existing.is_empty() {
                 // Add if not found
-                let new_name = passed_lib.new_name.as_ref().map(|s| &**s); // &Option<String> -> Option<&str>
+                let new_name: Option<&str> = passed_lib.new_name.as_deref();
                 let lib = NativeLib {
                     name: Some(Symbol::intern(new_name.unwrap_or(&passed_lib.name))),
                     kind: passed_lib.kind,

compiler/rustc_middle/src/ty/layout.rs

@@ -986,7 +986,7 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> {
                             let niche = if def.repr.hide_niche() {
                                 None
                             } else {
-                                Niche::from_scalar(dl, Size::ZERO, scalar.clone())
+                                Niche::from_scalar(dl, Size::ZERO, *scalar)
                             };
                             if let Some(niche) = niche {
                                 match st.largest_niche {
@@ -2273,7 +2273,7 @@ where
         ) -> TyMaybeWithLayout<'tcx> {
             let tcx = cx.tcx();
             let tag_layout = |tag: Scalar| -> TyAndLayout<'tcx> {
-                let layout = Layout::scalar(cx, tag.clone());
+                let layout = Layout::scalar(cx, tag);
                 TyAndLayout { layout: tcx.intern_layout(layout), ty: tag.value.to_ty(tcx) }
             };