diff --git a/src/abi/mod.rs b/src/abi/mod.rs
index 7b9f3e6761a..3eed2e4a11e 100644
--- a/src/abi/mod.rs
+++ b/src/abi/mod.rs
@@ -25,7 +25,7 @@ fn clif_sig_from_fn_abi<'tcx>(
 ) -> Signature {
     let call_conv = conv_to_call_conv(tcx.sess, fn_abi.conv, default_call_conv);
 
-    let inputs = fn_abi.args.iter().map(|arg_abi| arg_abi.get_abi_param(tcx).into_iter()).flatten();
+    let inputs = fn_abi.args.iter().flat_map(|arg_abi| arg_abi.get_abi_param(tcx).into_iter());
 
     let (return_ptr, returns) = fn_abi.ret.get_abi_return(tcx);
     // Sometimes the first param is an pointer to the place where the return value needs to be stored.
@@ -513,10 +513,9 @@ pub(crate) fn codegen_terminator_call<'tcx>(
                 args.into_iter()
                     .enumerate()
                     .skip(if first_arg_override.is_some() { 1 } else { 0 })
-                    .map(|(i, arg)| {
+                    .flat_map(|(i, arg)| {
                         adjust_arg_for_abi(fx, arg.value, &fn_abi.args[i], arg.is_owned).into_iter()
-                    })
-                    .flatten(),
+                    }),
             )
             .collect::<Vec<Value>>();
 
diff --git a/src/base.rs b/src/base.rs
index c084d10502a..7ad24294900 100644
--- a/src/base.rs
+++ b/src/base.rs
@@ -1000,7 +1000,7 @@ fn codegen_panic_inner<'tcx>(
     let symbol_name = fx.tcx.symbol_name(instance).name;
 
     fx.lib_call(
-        &*symbol_name,
+        symbol_name,
         args.iter().map(|&arg| AbiParam::new(fx.bcx.func.dfg.value_type(arg))).collect(),
         vec![],
         args,
diff --git a/src/common.rs b/src/common.rs
index a8be0d32cc8..0615c06c0fe 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -75,7 +75,7 @@ fn clif_type_from_ty<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Option<types::Typ
         ty::Adt(adt_def, _) if adt_def.repr().simd() => {
             let (element, count) = match &tcx.layout_of(ParamEnv::reveal_all().and(ty)).unwrap().abi
             {
-                Abi::Vector { element, count } => (element.clone(), *count),
+                Abi::Vector { element, count } => (*element, *count),
                 _ => unreachable!(),
             };
 
diff --git a/src/constant.rs b/src/constant.rs
index 49c4f1aaaef..04e0897dad5 100644
--- a/src/constant.rs
+++ b/src/constant.rs
@@ -290,7 +290,7 @@ fn data_id_for_static(
         };
 
         let data_id = match module.declare_data(
-            &*symbol_name,
+            symbol_name,
             linkage,
             is_mutable,
             attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL),
@@ -338,7 +338,7 @@ fn data_id_for_static(
     };
 
     let data_id = match module.declare_data(
-        &*symbol_name,
+        symbol_name,
         linkage,
         is_mutable,
         attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL),
diff --git a/src/debuginfo/emit.rs b/src/debuginfo/emit.rs
index 9583cd2ec60..c4a5627e662 100644
--- a/src/debuginfo/emit.rs
+++ b/src/debuginfo/emit.rs
@@ -113,7 +113,7 @@ impl Writer for WriterRelocate {
                     offset: offset as u32,
                     size,
                     name: DebugRelocName::Symbol(symbol),
-                    addend: addend as i64,
+                    addend,
                     kind: object::RelocationKind::Absolute,
                 });
                 self.write_udata(0, size)
diff --git a/src/driver/aot.rs b/src/driver/aot.rs
index 58b01dfb5b0..6f96cb00df0 100644
--- a/src/driver/aot.rs
+++ b/src/driver/aot.rs
@@ -381,7 +381,7 @@ pub(crate) fn run_aot(
     };
 
     if tcx.dep_graph.is_fully_enabled() {
-        for cgu in &*cgus {
+        for cgu in cgus {
             tcx.ensure().codegen_unit(cgu.name());
         }
     }
@@ -421,7 +421,7 @@ pub(crate) fn run_aot(
                     CguReuse::PreLto => unreachable!(),
                     CguReuse::PostLto => {
                         concurrency_limiter.job_already_done();
-                        OngoingModuleCodegen::Sync(reuse_workproduct_for_cgu(tcx, &*cgu))
+                        OngoingModuleCodegen::Sync(reuse_workproduct_for_cgu(tcx, cgu))
                     }
                 }
             })
diff --git a/src/inline_asm.rs b/src/inline_asm.rs
index 6206fbf7dd5..3ba530c040f 100644
--- a/src/inline_asm.rs
+++ b/src/inline_asm.rs
@@ -242,7 +242,7 @@ pub(crate) fn codegen_inline_asm<'tcx>(
                 }
             }
             InlineAsmOperand::Const { ref value } => {
-                let (const_value, ty) = crate::constant::eval_mir_constant(fx, &*value)
+                let (const_value, ty) = crate::constant::eval_mir_constant(fx, value)
                     .unwrap_or_else(|| span_bug!(span, "asm const cannot be resolved"));
                 let value = rustc_codegen_ssa::common::asm_const_to_str(
                     fx.tcx,
@@ -334,13 +334,13 @@ pub(crate) fn codegen_inline_asm<'tcx>(
             }
             CInlineAsmOperand::Out { reg: _, late: _, place } => {
                 if let Some(place) = place {
-                    outputs.push((asm_gen.stack_slots_output[i].unwrap(), place.clone()));
+                    outputs.push((asm_gen.stack_slots_output[i].unwrap(), *place));
                 }
             }
             CInlineAsmOperand::InOut { reg: _, _late: _, in_value, out_place } => {
                 inputs.push((asm_gen.stack_slots_input[i].unwrap(), in_value.load_scalar(fx)));
                 if let Some(out_place) = out_place {
-                    outputs.push((asm_gen.stack_slots_output[i].unwrap(), out_place.clone()));
+                    outputs.push((asm_gen.stack_slots_output[i].unwrap(), *out_place));
                 }
             }
             CInlineAsmOperand::Const { value: _ } | CInlineAsmOperand::Symbol { symbol: _ } => {}
diff --git a/src/main_shim.rs b/src/main_shim.rs
index 3e3b6857134..bc227df11c8 100644
--- a/src/main_shim.rs
+++ b/src/main_shim.rs
@@ -28,7 +28,7 @@ pub(crate) fn maybe_create_entry_wrapper(
 
     if main_def_id.is_local() {
         let instance = Instance::mono(tcx, main_def_id).polymorphize(tcx);
-        if !is_jit && module.get_name(&*tcx.symbol_name(instance).name).is_none() {
+        if !is_jit && module.get_name(tcx.symbol_name(instance).name).is_none() {
             return;
         }
     } else if !is_primary_cgu {
diff --git a/src/unsize.rs b/src/unsize.rs
index 9c88f7dbcda..8c9ae9ba3b6 100644
--- a/src/unsize.rs
+++ b/src/unsize.rs
@@ -55,7 +55,7 @@ pub(crate) fn unsized_info<'tcx>(
                 old_info
             }
         }
-        (_, &ty::Dynamic(ref data, ..)) => crate::vtable::get_vtable(fx, source, data.principal()),
+        (_, ty::Dynamic(data, ..)) => crate::vtable::get_vtable(fx, source, data.principal()),
         _ => bug!("unsized_info: invalid unsizing {:?} -> {:?}", source, target),
     }
 }