Rollup merge of rust-lang#70269 - matthiaskrgr:clippy_closures, r=Dylan-DPC

remove redundant closures (clippy::redundant_closure)

Author: Centril

src/liballoc/collections/btree/map.rs

@@ -196,7 +196,7 @@ impl<K: Clone, V: Clone> Clone for BTreeMap<K, V> {
                                 (root, length)
                             };
 
-                            out_node.push(k, v, subroot.unwrap_or_else(|| node::Root::new_leaf()));
+                            out_node.push(k, v, subroot.unwrap_or_else(node::Root::new_leaf));
                             out_tree.length += 1 + sublength;
                         }
                     }
@@ -2147,7 +2147,7 @@ impl<K, V> BTreeMap<K, V> {
     /// If the root node is the empty (non-allocated) root node, allocate our
     /// own node.
     fn ensure_root_is_owned(&mut self) -> &mut node::Root<K, V> {
-        self.root.get_or_insert_with(|| node::Root::new_leaf())
+        self.root.get_or_insert_with(node::Root::new_leaf)
     }
 }
 

src/librustc/dep_graph/graph.rs

@@ -245,7 +245,7 @@ impl DepGraph {
         C: DepGraphSafe + StableHashingContextProvider<'a>,
     {
         if let Some(ref data) = self.data {
-            let task_deps = create_task(key).map(|deps| Lock::new(deps));
+            let task_deps = create_task(key).map(Lock::new);
 
             // In incremental mode, hash the result of the task. We don't
             // do anything with the hash yet, but we are computing it

src/librustc/mir/interpret/allocation.rs

@@ -796,7 +796,7 @@ impl UndefMask {
         }
 
         // FIXME(oli-obk): optimize this for allocations larger than a block.
-        let idx = (start.bytes()..end.bytes()).map(|i| Size::from_bytes(i)).find(|&i| !self.get(i));
+        let idx = (start.bytes()..end.bytes()).map(Size::from_bytes).find(|&i| !self.get(i));
 
         match idx {
             Some(idx) => Err(idx),

src/librustc_ast/ast.rs

@@ -250,7 +250,7 @@ impl ParenthesizedArgs {
     pub fn as_angle_bracketed_args(&self) -> AngleBracketedArgs {
         AngleBracketedArgs {
             span: self.span,
-            args: self.inputs.iter().cloned().map(|input| GenericArg::Type(input)).collect(),
+            args: self.inputs.iter().cloned().map(GenericArg::Type).collect(),
             constraints: vec![],
         }
     }

src/librustc_ast_lowering/path.rs

@@ -272,7 +272,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         if !generic_args.parenthesized && !has_lifetimes {
             generic_args.args = self
                 .elided_path_lifetimes(path_span, expected_lifetimes)
-                .map(|lt| GenericArg::Lifetime(lt))
+                .map(GenericArg::Lifetime)
                 .chain(generic_args.args.into_iter())
                 .collect();
             if expected_lifetimes > 0 && param_mode == ParamMode::Explicit {

src/librustc_builtin_macros/deriving/generic/ty.rs

@@ -76,8 +76,8 @@ impl<'a> Path<'a> {
             self.params.iter().map(|t| t.to_ty(cx, span, self_ty, self_generics)).collect();
         let params = lt
             .into_iter()
-            .map(|lt| GenericArg::Lifetime(lt))
-            .chain(tys.into_iter().map(|ty| GenericArg::Type(ty)))
+            .map(GenericArg::Lifetime)
+            .chain(tys.into_iter().map(GenericArg::Type))
             .collect();
 
         match self.kind {

src/librustc_data_structures/sharded.rs

@@ -30,7 +30,7 @@ pub struct Sharded<T> {
 impl<T: Default> Default for Sharded<T> {
     #[inline]
     fn default() -> Self {
-        Self::new(|| T::default())
+        Self::new(T::default)
     }
 }
 

src/librustc_errors/diagnostic_builder.rs

@@ -162,7 +162,7 @@ impl<'a> DiagnosticBuilder<'a> {
         message: &str,
         span: Option<S>,
     ) -> &mut Self {
-        let span = span.map(|s| s.into()).unwrap_or_else(|| MultiSpan::new());
+        let span = span.map(|s| s.into()).unwrap_or_else(MultiSpan::new);
         self.0.diagnostic.sub(level, message, span, None);
         self
     }

src/librustc_feature/lib.rs

@@ -51,7 +51,7 @@ pub struct Feature {
 
 impl Feature {
     fn issue(&self) -> Option<NonZeroU32> {
-        self.issue.and_then(|i| NonZeroU32::new(i))
+        self.issue.and_then(NonZeroU32::new)
     }
 }
 

src/librustc_interface/passes.rs

@@ -703,7 +703,7 @@ impl<'tcx> QueryContext<'tcx> {
     where
         F: FnOnce(TyCtxt<'tcx>) -> R,
     {
-        ty::tls::enter_global(self.0, |tcx| f(tcx))
+        ty::tls::enter_global(self.0, f)
     }
 
     pub fn print_stats(&mut self) {