Rollup merge of #131697 - ShE3py:rt-arg-lifetimes, r=Amanieu

`rt::Argument`: elide lifetimes
`@rustbot` label +C-cleanup

Author: workingjubilee

library/core/src/fmt/rt.rs

@@ -94,11 +94,11 @@ pub struct Argument<'a> {
 }
 
 #[rustc_diagnostic_item = "ArgumentMethods"]
-impl<'a>Argument<'a>{
+implArgument<'_>{
 #[inline(always)]
-fnnew<'b,T>(x:&'bT,f:fn(&T,&mutFormatter<'_>) -> Result) -> Argument<'b>{
+fnnew<'a,T>(x:&'aT,f:fn(&T,&mutFormatter<'_>) -> Result) -> Argument<'a>{
 Argument{
-// INVARIANT: this creates an `ArgumentType<'b>` from a `&'b T` and
+// INVARIANT: this creates an `ArgumentType<'a>` from a `&'a T` and
 // a `fn(&T, ...)`, so the invariant is maintained.
 ty:ArgumentType::Placeholder{
 value:NonNull::from(x).cast(),
@@ -110,43 +110,43 @@ impl<'a> Argument<'a> {
 }
 
 #[inline(always)]
-pubfnnew_display<'b,T:Display>(x:&'bT) -> Argument<'b>{
+pubfnnew_display<T:Display>(x:&T) -> Argument<'_>{
 Self::new(x,Display::fmt)
 }
 #[inline(always)]
-pubfnnew_debug<'b,T:Debug>(x:&'bT) -> Argument<'b>{
+pubfnnew_debug<T:Debug>(x:&T) -> Argument<'_>{
 Self::new(x,Debug::fmt)
 }
 #[inline(always)]
-pubfnnew_debug_noop<'b,T:Debug>(x:&'bT) -> Argument<'b>{
+pubfnnew_debug_noop<T:Debug>(x:&T) -> Argument<'_>{
 Self::new(x, |_, _| Ok(()))
 }
 #[inline(always)]
-pubfnnew_octal<'b,T:Octal>(x:&'bT) -> Argument<'b>{
+pubfnnew_octal<T:Octal>(x:&T) -> Argument<'_>{
 Self::new(x,Octal::fmt)
 }
 #[inline(always)]
-pubfnnew_lower_hex<'b,T:LowerHex>(x:&'bT) -> Argument<'b>{
+pubfnnew_lower_hex<T:LowerHex>(x:&T) -> Argument<'_>{
 Self::new(x,LowerHex::fmt)
 }
 #[inline(always)]
-pubfnnew_upper_hex<'b,T:UpperHex>(x:&'bT) -> Argument<'b>{
+pubfnnew_upper_hex<T:UpperHex>(x:&T) -> Argument<'_>{
 Self::new(x,UpperHex::fmt)
 }
 #[inline(always)]
-pubfnnew_pointer<'b,T:Pointer>(x:&'bT) -> Argument<'b>{
+pubfnnew_pointer<T:Pointer>(x:&T) -> Argument<'_>{
 Self::new(x,Pointer::fmt)
 }
 #[inline(always)]
-pubfnnew_binary<'b,T:Binary>(x:&'bT) -> Argument<'b>{
+pubfnnew_binary<T:Binary>(x:&T) -> Argument<'_>{
 Self::new(x,Binary::fmt)
 }
 #[inline(always)]
-pubfnnew_lower_exp<'b,T:LowerExp>(x:&'bT) -> Argument<'b>{
+pubfnnew_lower_exp<T:LowerExp>(x:&T) -> Argument<'_>{
 Self::new(x,LowerExp::fmt)
 }
 #[inline(always)]
-pubfnnew_upper_exp<'b,T:UpperExp>(x:&'bT) -> Argument<'b>{
+pubfnnew_upper_exp<T:UpperExp>(x:&T) -> Argument<'_>{
 Self::new(x,UpperExp::fmt)
 }
 #[inline(always)]

tests/ui/closures/issue-111932.stderr

@@ -17,7 +17,7 @@ LL | println!("{:?}", foo);
  | required by a bound introduced by this call
  |
  = help: the trait `Sized` is not implemented for `dyn Foo`
-note: required by an implicit `Sized` bound in `core::fmt::rt::Argument::<'a>::new_debug`
+note: required by an implicit `Sized` bound in `core::fmt::rt::Argument::<'_>::new_debug`
  --> $SRC_DIR/core/src/fmt/rt.rs:LL:COL
  = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
 

tests/ui/const-generics/infer/issue-77092.stderr

@@ -25,7 +25,7 @@ LL | println!("{:?}", take_array_from_mut(&mut arr, i));
  = note: required for `[i32; _]` to implement `Debug`
  = note: 1 redundant requirement hidden
  = note: required for `&mut [i32; _]` to implement `Debug`
-note: required by a bound in `core::fmt::rt::Argument::<'a>::new_debug`
+note: required by a bound in `core::fmt::rt::Argument::<'_>::new_debug`
  --> $SRC_DIR/core/src/fmt/rt.rs:LL:COL
 help: consider specifying the generic arguments
  |

tests/ui/fmt/ifmt-unimpl.stderr

@@ -17,7 +17,7 @@ LL | format!("{:X}", "3");
  i32
  and 9 others
  = note: required for `&str` to implement `UpperHex`
-note: required by a bound in `core::fmt::rt::Argument::<'a>::new_upper_hex`
+note: required by a bound in `core::fmt::rt::Argument::<'_>::new_upper_hex`
  --> $SRC_DIR/core/src/fmt/rt.rs:LL:COL
  = note: this error originates in the macro `$crate::__export::format_args` which comes from the expansion of the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)