Auto merge of rust-lang#62069 - Centril:rollup-m8n4uw7, r=Centril

Rollup of 5 pull requests

Successful merges:

 - rust-lang#62047 (Trigger `unused_attribute` lint on `#[cfg_attr($pred,)]`)
 - rust-lang#62049 (Fix one missing `dyn`.)
 - rust-lang#62051 (Lint empty `#[derive()]` as unused attribute.)
 - rust-lang#62057 (Deny explicit_outlives_requirements in the compiler)
 - rust-lang#62068 (Fix meta-variable binding errors in macros)

Failed merges:

r? @ghost

src/libcore/fmt/mod.rs

@@ -2070,19 +2070,19 @@ macro_rules! tuple {
     () => ();
     ( $($name:ident,)+ ) => (
         #[stable(feature = "rust1", since = "1.0.0")]
-        impl<$($name:Debug),*> Debug for ($($name,)*) where last_type!($($name,)+): ?Sized {
+        impl<$($name:Debug),+> Debug for ($($name,)+) where last_type!($($name,)+): ?Sized {
             #[allow(non_snake_case, unused_assignments)]
             fn fmt(&self, f: &mut Formatter<'_>) -> Result {
                 let mut builder = f.debug_tuple("");
-                let ($(ref $name,)*) = *self;
+                let ($(ref $name,)+) = *self;
                 $(
                     builder.field(&$name);
-                )*
+                )+
 
                 builder.finish()
             }
         }
-        peel! { $($name,)* }
+        peel! { $($name,)+ }
     )
 }
 

src/libcore/hash/mod.rs

@@ -617,11 +617,11 @@ mod impls {
 
         ( $($name:ident)+) => (
             #[stable(feature = "rust1", since = "1.0.0")]
-            impl<$($name: Hash),*> Hash for ($($name,)*) where last_type!($($name,)+): ?Sized {
+            impl<$($name: Hash),+> Hash for ($($name,)+) where last_type!($($name,)+): ?Sized {
                 #[allow(non_snake_case)]
                 fn hash<S: Hasher>(&self, state: &mut S) {
-                    let ($(ref $name,)*) = *self;
-                    $($name.hash(state);)*
+                    let ($(ref $name,)+) = *self;
+                    $($name.hash(state);)+
                 }
             }
         );

src/libcore/iter/traits/accum.rs

@@ -72,10 +72,10 @@ macro_rules! integer_sum_product {
     ($($a:ty)*) => (
         integer_sum_product!(@impls 0, 1,
                 #[stable(feature = "iter_arith_traits", since = "1.12.0")],
-                $($a)+);
+                $($a)*);
         integer_sum_product!(@impls Wrapping(0), Wrapping(1),
                 #[stable(feature = "wrapping_iter_arith", since = "1.14.0")],
-                $(Wrapping<$a>)+);
+                $(Wrapping<$a>)*);
     );
 }
 

src/libcore/macros.rs

@@ -15,7 +15,7 @@ macro_rules! panic {
         $crate::panic!($msg)
     );
     ($fmt:expr, $($arg:tt)+) => ({
-        $crate::panicking::panic_fmt(format_args!($fmt, $($arg)*),
+        $crate::panicking::panic_fmt(format_args!($fmt, $($arg)+),
                                      &(file!(), line!(), __rust_unstable_column!()))
     });
 }
@@ -558,7 +558,7 @@ macro_rules! unreachable {
 #[stable(feature = "rust1", since = "1.0.0")]
 macro_rules! unimplemented {
     () => (panic!("not yet implemented"));
-    ($($arg:tt)+) => (panic!("not yet implemented: {}", format_args!($($arg)*)));
+    ($($arg:tt)+) => (panic!("not yet implemented: {}", format_args!($($arg)+)));
 }
 
 /// Indicates unfinished code.
@@ -617,7 +617,7 @@ macro_rules! unimplemented {
 #[unstable(feature = "todo_macro", issue = "59277")]
 macro_rules! todo {
     () => (panic!("not yet implemented"));
-    ($($arg:tt)+) => (panic!("not yet implemented: {}", format_args!($($arg)*)));
+    ($($arg:tt)+) => (panic!("not yet implemented: {}", format_args!($($arg)+)));
 }
 
 /// Creates an array of [`MaybeUninit`].

src/libcore/marker.rs

@@ -103,7 +103,7 @@ pub trait Sized {
 /// `Unsize` is implemented for:
 ///
 /// - `[T; N]` is `Unsize<[T]>`
-/// - `T` is `Unsize<Trait>` when `T: Trait`
+/// - `T` is `Unsize<dyn Trait>` when `T: Trait`
 /// - `Foo<..., T, ...>` is `Unsize<Foo<..., U, ...>>` if:
 ///   - `T: Unsize<U>`
 ///   - Foo is a struct

src/libcore/ptr/mod.rs

@@ -2725,12 +2725,12 @@ macro_rules! fnptr_impls_safety_abi {
 
 macro_rules! fnptr_impls_args {
     ($($Arg: ident),+) => {
-        fnptr_impls_safety_abi! { extern "Rust" fn($($Arg),*) -> Ret, $($Arg),* }
-        fnptr_impls_safety_abi! { extern "C" fn($($Arg),*) -> Ret, $($Arg),* }
-        fnptr_impls_safety_abi! { extern "C" fn($($Arg),* , ...) -> Ret, $($Arg),* }
-        fnptr_impls_safety_abi! { unsafe extern "Rust" fn($($Arg),*) -> Ret, $($Arg),* }
-        fnptr_impls_safety_abi! { unsafe extern "C" fn($($Arg),*) -> Ret, $($Arg),* }
-        fnptr_impls_safety_abi! { unsafe extern "C" fn($($Arg),* , ...) -> Ret, $($Arg),* }
+        fnptr_impls_safety_abi! { extern "Rust" fn($($Arg),+) -> Ret, $($Arg),+ }
+        fnptr_impls_safety_abi! { extern "C" fn($($Arg),+) -> Ret, $($Arg),+ }
+        fnptr_impls_safety_abi! { extern "C" fn($($Arg),+ , ...) -> Ret, $($Arg),+ }
+        fnptr_impls_safety_abi! { unsafe extern "Rust" fn($($Arg),+) -> Ret, $($Arg),+ }
+        fnptr_impls_safety_abi! { unsafe extern "C" fn($($Arg),+) -> Ret, $($Arg),+ }
+        fnptr_impls_safety_abi! { unsafe extern "C" fn($($Arg),+ , ...) -> Ret, $($Arg),+ }
     };
     () => {
         // No variadic functions with 0 parameters

src/libproc_macro/bridge/rpc.rs

@@ -59,7 +59,7 @@ macro_rules! rpc_encode_decode {
         }
     };
     (enum $name:ident $(<$($T:ident),+>)? { $($variant:ident $(($field:ident))*),* $(,)? }) => {
-        impl<S, $($($T: Encode<S>),+)?> Encode<S> for $name $(<$($T),+>)* {
+        impl<S, $($($T: Encode<S>),+)?> Encode<S> for $name $(<$($T),+>)? {
             fn encode(self, w: &mut Writer, s: &mut S) {
                 // HACK(eddyb): `Tag` enum duplicated between the
                 // two impls as there's no other place to stash it.
@@ -79,8 +79,8 @@ macro_rules! rpc_encode_decode {
             }
         }
 
-        impl<S, $($($T: for<'s> DecodeMut<'a, 's, S>),+)*> DecodeMut<'a, '_, S>
-            for $name $(<$($T),+>)*
+        impl<S, $($($T: for<'s> DecodeMut<'a, 's, S>),+)?> DecodeMut<'a, '_, S>
+            for $name $(<$($T),+>)?
         {
             fn decode(r: &mut Reader<'a>, s: &mut S) -> Self {
                 // HACK(eddyb): `Tag` enum duplicated between the

src/librustc/hir/itemlikevisit.rs

@@ -51,7 +51,7 @@ pub trait ItemLikeVisitor<'hir> {
     fn visit_impl_item(&mut self, impl_item: &'hir ImplItem);
 }
 
-pub struct DeepVisitor<'v, V: 'v> {
+pub struct DeepVisitor<'v, V> {
     visitor: &'v mut V,
 }
 

src/librustc/infer/nll_relate/mod.rs

@@ -800,7 +800,7 @@ impl<'me, 'tcx> TypeVisitor<'tcx> for ScopeInstantiator<'me, 'tcx> {
 /// [blog post]: https://is.gd/0hKvIr
 struct TypeGeneralizer<'me, 'tcx, D>
 where
-    D: TypeRelatingDelegate<'tcx> + 'me,
+    D: TypeRelatingDelegate<'tcx>,
 {
     infcx: &'me InferCtxt<'me, 'tcx>,
 

src/librustc/lib.rs

@@ -31,7 +31,6 @@
 #![deny(rust_2018_idioms)]
 #![deny(internal)]
 #![deny(unused_lifetimes)]
-#![allow(explicit_outlives_requirements)]
 
 #![feature(arbitrary_self_types)]
 #![feature(box_patterns)]

src/librustc/middle/weak_lang_items.rs

@@ -147,7 +147,7 @@ impl<'tcx> TyCtxt<'tcx> {
         let lang_items = self.lang_items();
         let did = Some(item_def_id);
 
-        $(lang_items.$name() == did)||+
+        $(lang_items.$name() == did)||*
     }
 }
 

src/librustc/ty/context.rs

@@ -231,7 +231,7 @@ pub struct CommonConsts<'tcx> {
     pub err: &'tcx Const<'tcx>,
 }
 
-pub struct LocalTableInContext<'a, V: 'a> {
+pub struct LocalTableInContext<'a, V> {
     local_id_root: Option<DefId>,
     data: &'a ItemLocalMap<V>
 }
@@ -294,7 +294,7 @@ impl<'a, V> ::std::ops::Index<hir::HirId> for LocalTableInContext<'a, V> {
     }
 }
 
-pub struct LocalTableInContextMut<'a, V: 'a> {
+pub struct LocalTableInContextMut<'a, V> {
     local_id_root: Option<DefId>,
     data: &'a mut ItemLocalMap<V>
 }
@@ -2171,7 +2171,7 @@ impl<'tcx> TyCtxt<'tcx> {
 
 
 /// An entry in an interner.
-struct Interned<'tcx, T: 'tcx+?Sized>(&'tcx T);
+struct Interned<'tcx, T: ?Sized>(&'tcx T);
 
 impl<'tcx, T: 'tcx+?Sized> Clone for Interned<'tcx, T> {
     fn clone(&self) -> Self {

src/librustc/ty/query/plumbing.rs

@@ -89,7 +89,7 @@ macro_rules! profq_query_msg {
 
 /// A type representing the responsibility to execute the job in the `job` field.
 /// This will poison the relevant query if dropped.
-pub(super) struct JobOwner<'a, 'tcx, Q: QueryDescription<'tcx> + 'a> {
+pub(super) struct JobOwner<'a, 'tcx, Q: QueryDescription<'tcx>> {
     cache: &'a Lock<QueryCache<'tcx, Q>>,
     key: Q::Key,
     job: Lrc<QueryJob<'tcx>>,
@@ -230,7 +230,7 @@ pub struct CycleError<'tcx> {
 }
 
 /// The result of `try_get_lock`
-pub(super) enum TryGetJob<'a, 'tcx, D: QueryDescription<'tcx> + 'a> {
+pub(super) enum TryGetJob<'a, 'tcx, D: QueryDescription<'tcx>> {
     /// The query is not yet started. Contains a guard to the cache eventually used to start it.
     NotYetStarted(JobOwner<'a, 'tcx, D>),
 

src/librustc_codegen_llvm/builder.rs

@@ -110,7 +110,7 @@ macro_rules! builder_methods_for_value_instructions {
             unsafe {
                 llvm::$llvm_capi(self.llbuilder, $($arg,)* UNNAMED)
             }
-        })*
+        })+
     }
 }
 

src/librustc_codegen_llvm/lib.rs

@@ -24,7 +24,6 @@
 #![deny(rust_2018_idioms)]
 #![deny(internal)]
 #![deny(unused_lifetimes)]
-#![allow(explicit_outlives_requirements)]
 
 use back::write::{create_target_machine, create_informational_target_machine};
 use syntax_pos::symbol::Symbol;

src/librustc_codegen_ssa/lib.rs

@@ -15,7 +15,6 @@
 #![deny(rust_2018_idioms)]
 #![deny(internal)]
 #![deny(unused_lifetimes)]
-#![allow(explicit_outlives_requirements)]
 
 #![recursion_limit="256"]
 

src/librustc_data_structures/indexed_vec.rs

@@ -423,7 +423,7 @@ macro_rules! newtype_index {
     (@derives      [$($derives:ident,)*]
      @attrs        [$(#[$attrs:meta])*]
      @type         [$type:ident]
-     @max          [$_max:expr]
+     @max          [$max:expr]
      @vis          [$v:vis]
      @debug_format [$debug_format:tt]
                    $(#[doc = $doc:expr])*

src/librustc_lint/types.rs

@@ -219,7 +219,7 @@ fn get_type_suggestion(t: Ty<'_>, val: u128, negative: bool) -> Option<String> {
                             return Some(format!("{:?}", $itypes))
                         })*
                         None
-                    },)*
+                    },)+
                     _ => None
                 }
             }

src/librustc_mir/dataflow/graphviz.rs

@@ -30,7 +30,7 @@ impl<'a, 'tcx, BD> MirWithFlowState<'tcx> for DataflowBuilder<'a, 'tcx, BD>
     fn flow_state(&self) -> &DataflowState<'tcx, Self::BD> { &self.flow_state.flow_state }
 }
 
-struct Graph<'a, 'tcx, MWF:'a, P> where
+struct Graph<'a, 'tcx, MWF, P> where
     MWF: MirWithFlowState<'tcx>
 {
     mbcx: &'a MWF,

src/librustc_mir/dataflow/mod.rs

@@ -181,7 +181,7 @@ where
 
 struct PropagationContext<'b, 'a, 'tcx, O>
 where
-    O: 'b + BitDenotation<'tcx>,
+    O: BitDenotation<'tcx>,
 {
     builder: &'b mut DataflowAnalysis<'a, 'tcx, O>,
 }

src/librustc_mir/interpret/intern.rs

@@ -21,7 +21,7 @@ use super::{
 };
 use crate::const_eval::{CompileTimeInterpreter, CompileTimeEvalContext};
 
-struct InternVisitor<'rt, 'mir: 'rt, 'tcx: 'rt + 'mir> {
+struct InternVisitor<'rt, 'mir, 'tcx> {
     /// previously encountered safe references
     ref_tracking: &'rt mut RefTracking<(MPlaceTy<'tcx>, Mutability, InternMode)>,
     ecx: &'rt mut CompileTimeEvalContext<'mir, 'tcx>,

src/librustc_mir/lib.rs

@@ -30,7 +30,6 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![deny(rust_2018_idioms)]
 #![deny(internal)]
 #![deny(unused_lifetimes)]
-#![allow(explicit_outlives_requirements)]
 
 #[macro_use] extern crate log;
 #[macro_use]

src/librustc_mir/util/elaborate_drops.rs

@@ -92,7 +92,7 @@ pub trait DropElaborator<'a, 'tcx>: fmt::Debug {
 #[derive(Debug)]
 struct DropCtxt<'l, 'b, 'tcx, D>
 where
-    D: DropElaborator<'b, 'tcx> + 'l,
+    D: DropElaborator<'b, 'tcx>,
 {
     elaborator: &'l mut D,
 

src/librustc_target/spec/mod.rs

@@ -119,19 +119,19 @@ macro_rules! flavor_mappings {
     ($((($($flavor:tt)*), $string:expr),)*) => (
         impl LinkerFlavor {
             pub const fn one_of() -> &'static str {
-                concat!("one of: ", $($string, " ",)+)
+                concat!("one of: ", $($string, " ",)*)
             }
 
             pub fn from_str(s: &str) -> Option<Self> {
                 Some(match s {
-                    $($string => $($flavor)*,)+
+                    $($string => $($flavor)*,)*
                     _ => return None,
                 })
             }
 
             pub fn desc(&self) -> &str {
                 match *self {
-                    $($($flavor)* => $string,)+
+                    $($($flavor)* => $string,)*
                 }
             }
         }

src/librustc_typeck/lib.rs

@@ -75,7 +75,6 @@ This API is completely unstable and subject to change.
 #![deny(rust_2018_idioms)]
 #![deny(internal)]
 #![deny(unused_lifetimes)]
-#![allow(explicit_outlives_requirements)]
 
 #[macro_use] extern crate log;
 #[macro_use] extern crate syntax;

src/libserialize/serialize.rs

@@ -739,33 +739,33 @@ macro_rules! count {
 macro_rules! tuple {
     () => ();
     ( $($name:ident,)+ ) => (
-        impl<$($name:Decodable),*> Decodable for ($($name,)*) {
+        impl<$($name:Decodable),+> Decodable for ($($name,)+) {
             #[allow(non_snake_case)]
-            fn decode<D: Decoder>(d: &mut D) -> Result<($($name,)*), D::Error> {
-                let len: usize = count!($($name)*);
+            fn decode<D: Decoder>(d: &mut D) -> Result<($($name,)+), D::Error> {
+                let len: usize = count!($($name)+);
                 d.read_tuple(len, |d| {
                     let mut i = 0;
                     let ret = ($(d.read_tuple_arg({ i+=1; i-1 }, |d| -> Result<$name, D::Error> {
                         Decodable::decode(d)
-                    })?,)*);
+                    })?,)+);
                     Ok(ret)
                 })
             }
         }
-        impl<$($name:Encodable),*> Encodable for ($($name,)*) {
+        impl<$($name:Encodable),+> Encodable for ($($name,)+) {
             #[allow(non_snake_case)]
             fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
-                let ($(ref $name,)*) = *self;
+                let ($(ref $name,)+) = *self;
                 let mut n = 0;
-                $(let $name = $name; n += 1;)*
+                $(let $name = $name; n += 1;)+
                 s.emit_tuple(n, |s| {
                     let mut i = 0;
-                    $(s.emit_tuple_arg({ i+=1; i-1 }, |s| $name.encode(s))?;)*
+                    $(s.emit_tuple_arg({ i+=1; i-1 }, |s| $name.encode(s))?;)+
                     Ok(())
                 })
             }
         }
-        peel! { $($name,)* }
+        peel! { $($name,)+ }
     )
 }