Auto merge of rust-lang#73617 - Dylan-DPC:rollup-zugh80o, r=Dylan-DPC

Rollup of 6 pull requests

Successful merges:

 - rust-lang#71660 (impl PartialEq<Vec<B>> for &[A], &mut [A])
 - rust-lang#72623 (Prefer accessible paths in 'use' suggestions)
 - rust-lang#73502 (Add E0765)
 - rust-lang#73580 (deprecate wrapping_offset_from)
 - rust-lang#73582 (Miri: replace many bug! by span_bug!)
 - rust-lang#73585 (Do not send a notification for P-high stable regressions)

Failed merges:

 - rust-lang#73581 (Create 0766 error code)

r? @ghost

src/liballoc/tests/vec.rs

@@ -1,5 +1,6 @@
 use std::borrow::Cow;
 use std::collections::TryReserveError::*;
+use std::fmt::Debug;
 use std::mem::size_of;
 use std::panic::{catch_unwind, AssertUnwindSafe};
 use std::vec::{Drain, IntoIter};
@@ -1573,3 +1574,56 @@ fn test_push_growth_strategy() {
         }
     }
 }
+
+macro_rules! generate_assert_eq_vec_and_prim {
+    ($name:ident<$B:ident>($type:ty)) => {
+        fn $name<A: PartialEq<$B> + Debug, $B: Debug>(a: Vec<A>, b: $type) {
+            assert!(a == b);
+            assert_eq!(a, b);
+        }
+    };
+}
+
+generate_assert_eq_vec_and_prim! { assert_eq_vec_and_slice  <B>(&[B])   }
+generate_assert_eq_vec_and_prim! { assert_eq_vec_and_array_3<B>([B; 3]) }
+
+#[test]
+fn partialeq_vec_and_prim() {
+    assert_eq_vec_and_slice(vec![1, 2, 3], &[1, 2, 3]);
+    assert_eq_vec_and_array_3(vec![1, 2, 3], [1, 2, 3]);
+}
+
+macro_rules! assert_partial_eq_valid {
+    ($a2:ident, $a3:ident; $b2:ident, $b3: ident) => {
+        assert!($a2 == $b2);
+        assert!($a2 != $b3);
+        assert!($a3 != $b2);
+        assert!($a3 == $b3);
+        assert_eq!($a2, $b2);
+        assert_ne!($a2, $b3);
+        assert_ne!($a3, $b2);
+        assert_eq!($a3, $b3);
+    };
+}
+
+#[test]
+fn partialeq_vec_full() {
+    let vec2: Vec<_> = vec![1, 2];
+    let vec3: Vec<_> = vec![1, 2, 3];
+    let slice2: &[_] = &[1, 2];
+    let slice3: &[_] = &[1, 2, 3];
+    let slicemut2: &[_] = &mut [1, 2];
+    let slicemut3: &[_] = &mut [1, 2, 3];
+    let array2: [_; 2] = [1, 2];
+    let array3: [_; 3] = [1, 2, 3];
+    let arrayref2: &[_; 2] = &[1, 2];
+    let arrayref3: &[_; 3] = &[1, 2, 3];
+
+    assert_partial_eq_valid!(vec2,vec3; vec2,vec3);
+    assert_partial_eq_valid!(vec2,vec3; slice2,slice3);
+    assert_partial_eq_valid!(vec2,vec3; slicemut2,slicemut3);
+    assert_partial_eq_valid!(slice2,slice3; vec2,vec3);
+    assert_partial_eq_valid!(slicemut2,slicemut3; vec2,vec3);
+    assert_partial_eq_valid!(vec2,vec3; array2,array3);
+    assert_partial_eq_valid!(vec2,vec3; arrayref2,arrayref3);
+}

src/liballoc/vec.rs

@@ -2342,12 +2342,12 @@ impl<'a, T: 'a + Copy> Extend<&'a T> for Vec<T> {
 }
 
 macro_rules! __impl_slice_eq1 {
-    ([$($vars:tt)*] $lhs:ty, $rhs:ty, $($constraints:tt)*) => {
-        #[stable(feature = "rust1", since = "1.0.0")]
+    ([$($vars:tt)*] $lhs:ty, $rhs:ty $(where $ty:ty: $bound:ident)?, #[$stability:meta]) => {
+        #[$stability]
         impl<A, B, $($vars)*> PartialEq<$rhs> for $lhs
         where
             A: PartialEq<B>,
-            $($constraints)*
+            $($ty: $bound)?
         {
             #[inline]
             fn eq(&self, other: &$rhs) -> bool { self[..] == other[..] }
@@ -2357,18 +2357,23 @@ macro_rules! __impl_slice_eq1 {
     }
 }
 
-__impl_slice_eq1! { [] Vec<A>, Vec<B>, }
-__impl_slice_eq1! { [] Vec<A>, &[B], }
-__impl_slice_eq1! { [] Vec<A>, &mut [B], }
-__impl_slice_eq1! { [] Cow<'_, [A]>, Vec<B>, A: Clone }
-__impl_slice_eq1! { [] Cow<'_, [A]>, &[B], A: Clone }
-__impl_slice_eq1! { [] Cow<'_, [A]>, &mut [B], A: Clone }
-__impl_slice_eq1! { [const N: usize] Vec<A>, [B; N], [B; N]: LengthAtMost32 }
-__impl_slice_eq1! { [const N: usize] Vec<A>, &[B; N], [B; N]: LengthAtMost32 }
+__impl_slice_eq1! { [] Vec<A>, Vec<B>, #[stable(feature = "rust1", since = "1.0.0")] }
+__impl_slice_eq1! { [] Vec<A>, &[B], #[stable(feature = "rust1", since = "1.0.0")] }
+__impl_slice_eq1! { [] Vec<A>, &mut [B], #[stable(feature = "rust1", since = "1.0.0")] }
+__impl_slice_eq1! { [] &[A], Vec<B>, #[stable(feature = "partialeq_vec_for_ref_slice", since = "1.46.0")] }
+__impl_slice_eq1! { [] &mut [A], Vec<B>, #[stable(feature = "partialeq_vec_for_ref_slice", since = "1.46.0")] }
+__impl_slice_eq1! { [] Cow<'_, [A]>, Vec<B> where A: Clone, #[stable(feature = "rust1", since = "1.0.0")] }
+__impl_slice_eq1! { [] Cow<'_, [A]>, &[B] where A: Clone, #[stable(feature = "rust1", since = "1.0.0")] }
+__impl_slice_eq1! { [] Cow<'_, [A]>, &mut [B] where A: Clone, #[stable(feature = "rust1", since = "1.0.0")] }
+__impl_slice_eq1! { [const N: usize] Vec<A>, [B; N] where [B; N]: LengthAtMost32, #[stable(feature = "rust1", since = "1.0.0")] }
+__impl_slice_eq1! { [const N: usize] Vec<A>, &[B; N] where [B; N]: LengthAtMost32, #[stable(feature = "rust1", since = "1.0.0")] }
 
 // NOTE: some less important impls are omitted to reduce code bloat
 // FIXME(Centril): Reconsider this?
 //__impl_slice_eq1! { [const N: usize] Vec<A>, &mut [B; N], [B; N]: LengthAtMost32 }
+//__impl_slice_eq1! { [const N: usize] [A; N], Vec<B>, [A; N]: LengthAtMost32 }
+//__impl_slice_eq1! { [const N: usize] &[A; N], Vec<B>, [A; N]: LengthAtMost32 }
+//__impl_slice_eq1! { [const N: usize] &mut [A; N], Vec<B>, [A; N]: LengthAtMost32 }
 //__impl_slice_eq1! { [const N: usize] Cow<'a, [A]>, [B; N], [B; N]: LengthAtMost32 }
 //__impl_slice_eq1! { [const N: usize] Cow<'a, [A]>, &[B; N], [B; N]: LengthAtMost32 }
 //__impl_slice_eq1! { [const N: usize] Cow<'a, [A]>, &mut [B; N], [B; N]: LengthAtMost32 }

src/libcore/ptr/const_ptr.rs

@@ -330,6 +330,12 @@ impl<T: ?Sized> *const T {
     /// assert_eq!(ptr2.wrapping_offset_from(ptr1), 2);
     /// ```
     #[unstable(feature = "ptr_wrapping_offset_from", issue = "41079")]
+    #[rustc_deprecated(
+        since = "1.46.0",
+        reason = "Pointer distances across allocation \
+        boundaries are not typically meaningful. \
+        Use integer subtraction if you really need this."
+    )]
     #[inline]
     pub fn wrapping_offset_from(self, origin: *const T) -> isize
     where

src/libcore/ptr/mut_ptr.rs

@@ -380,11 +380,18 @@ impl<T: ?Sized> *mut T {
     /// assert_eq!(ptr2.wrapping_offset_from(ptr1), 2);
     /// ```
     #[unstable(feature = "ptr_wrapping_offset_from", issue = "41079")]
+    #[rustc_deprecated(
+        since = "1.46.0",
+        reason = "Pointer distances across allocation \
+        boundaries are not typically meaningful. \
+        Use integer subtraction if you really need this."
+    )]
     #[inline]
     pub fn wrapping_offset_from(self, origin: *const T) -> isize
     where
         T: Sized,
     {
+        #[allow(deprecated_in_future, deprecated)]
         (self as *const T).wrapping_offset_from(origin)
     }
 

src/librustc_error_codes/error_codes.rs

@@ -445,6 +445,7 @@ E0761: include_str!("./error_codes/E0761.md"),
 E0762: include_str!("./error_codes/E0762.md"),
 E0763: include_str!("./error_codes/E0763.md"),
 E0764: include_str!("./error_codes/E0764.md"),
+E0765: include_str!("./error_codes/E0765.md"),
 ;
 //  E0006, // merged with E0005
 //  E0008, // cannot bind by-move into a pattern guard

src/librustc_error_codes/error_codes/E0765.md

@@ -0,0 +1,13 @@
+A double quote string (`"`) was not terminated.
+
+Erroneous code example:
+
+```compile_fail,E0765
+let s = "; // error!
+```
+
+To fix this error, add the missing double quote at the end of the string:
+
+```
+let s = ""; // ok!
+```

src/librustc_mir/interpret/cast.rs

@@ -52,7 +52,10 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                         }
 
                         if self.tcx.has_attr(def_id, sym::rustc_args_required_const) {
-                            bug!("reifying a fn ptr that requires const arguments");
+                            span_bug!(
+                                self.cur_span(),
+                                "reifying a fn ptr that requires const arguments"
+                            );
                         }
 
                         let instance = ty::Instance::resolve_for_fn_ptr(
@@ -66,7 +69,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                         let fn_ptr = self.memory.create_fn_alloc(FnVal::Instance(instance));
                         self.write_scalar(fn_ptr, dest)?;
                     }
-                    _ => bug!("reify fn pointer on {:?}", src.layout.ty),
+                    _ => span_bug!(self.cur_span(), "reify fn pointer on {:?}", src.layout.ty),
                 }
             }
 
@@ -77,7 +80,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                         // No change to value
                         self.write_immediate(*src, dest)?;
                     }
-                    _ => bug!("fn to unsafe fn cast on {:?}", cast_ty),
+                    _ => span_bug!(self.cur_span(), "fn to unsafe fn cast on {:?}", cast_ty),
                 }
             }
 
@@ -99,7 +102,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                         let fn_ptr = self.memory.create_fn_alloc(FnVal::Instance(instance));
                         self.write_scalar(fn_ptr, dest)?;
                     }
-                    _ => bug!("closure fn pointer on {:?}", src.layout.ty),
+                    _ => span_bug!(self.cur_span(), "closure fn pointer on {:?}", src.layout.ty),
                 }
             }
         }
@@ -162,7 +165,8 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 assert!(src.layout.ty.is_unsafe_ptr());
                 return match *src {
                     Immediate::ScalarPair(data, _) => Ok(data.into()),
-                    Immediate::Scalar(..) => bug!(
+                    Immediate::Scalar(..) => span_bug!(
+                        self.cur_span(),
                         "{:?} input to a fat-to-thin cast ({:?} -> {:?})",
                         *src,
                         src.layout.ty,
@@ -216,7 +220,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             }
 
             // Casts to bool are not permitted by rustc, no need to handle them here.
-            _ => bug!("invalid int to {:?} cast", cast_ty),
+            _ => span_bug!(self.cur_span(), "invalid int to {:?} cast", cast_ty),
         }
     }
 
@@ -248,7 +252,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             // float -> f64
             Float(FloatTy::F64) => Scalar::from_f64(f.convert(&mut false).value),
             // That's it.
-            _ => bug!("invalid float to {:?} cast", dest_ty),
+            _ => span_bug!(self.cur_span(), "invalid float to {:?} cast", dest_ty),
         }
     }
 
@@ -287,7 +291,9 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 self.write_immediate(val, dest)
             }
 
-            _ => bug!("invalid unsizing {:?} -> {:?}", src.layout.ty, cast_ty),
+            _ => {
+                span_bug!(self.cur_span(), "invalid unsizing {:?} -> {:?}", src.layout.ty, cast_ty)
+            }
         }
     }
 
@@ -307,7 +313,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 assert_eq!(def_a, def_b);
                 if def_a.is_box() || def_b.is_box() {
                     if !def_a.is_box() || !def_b.is_box() {
-                        bug!("invalid unsizing between {:?} -> {:?}", src.layout.ty, cast_ty.ty);
+                        span_bug!(
+                            self.cur_span(),
+                            "invalid unsizing between {:?} -> {:?}",
+                            src.layout.ty,
+                            cast_ty.ty
+                        );
                     }
                     return self.unsize_into_ptr(
                         src,
@@ -335,7 +346,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 }
                 Ok(())
             }
-            _ => bug!("unsize_into: invalid conversion: {:?} -> {:?}", src.layout, dest.layout),
+            _ => span_bug!(
+                self.cur_span(),
+                "unsize_into: invalid conversion: {:?} -> {:?}",
+                src.layout,
+                dest.layout
+            ),
         }
     }
 }

src/librustc_mir/interpret/eval_context.rs

@@ -536,7 +536,10 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                         if sized_size == Size::ZERO {
                             return Ok(None);
                         } else {
-                            bug!("Fields cannot be extern types, unless they are at offset 0")
+                            span_bug!(
+                                self.cur_span(),
+                                "Fields cannot be extern types, unless they are at offset 0"
+                            )
                         }
                     }
                 };
@@ -584,7 +587,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
 
             ty::Foreign(_) => Ok(None),
 
-            _ => bug!("size_and_align_of::<{:?}> not supported", layout.ty),
+            _ => span_bug!(self.cur_span(), "size_and_align_of::<{:?}> not supported", layout.ty),
         }
     }
     #[inline]

src/librustc_mir/interpret/intrinsics.rs

@@ -135,7 +135,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 let bits = self.force_bits(val, layout_of.size)?;
                 let kind = match layout_of.abi {
                     Abi::Scalar(ref scalar) => scalar.value,
-                    _ => bug!("{} called on invalid type {:?}", intrinsic_name, ty),
+                    _ => span_bug!(
+                        self.cur_span(),
+                        "{} called on invalid type {:?}",
+                        intrinsic_name,
+                        ty
+                    ),
                 };
                 let (nonzero, intrinsic_name) = match intrinsic_name {
                     sym::cttz_nonzero => (true, sym::cttz),

src/librustc_mir/interpret/operand.rs

@@ -311,7 +311,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         if let Ok(imm) = self.try_read_immediate(op)? {
             Ok(imm)
         } else {
-            bug!("primitive read failed for type: {:?}", op.layout.ty);
+            span_bug!(self.cur_span(), "primitive read failed for type: {:?}", op.layout.ty);
         }
     }
 
@@ -360,9 +360,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 let val = if offset.bytes() == 0 { a } else { b };
                 Immediate::from(val)
             }
-            Immediate::Scalar(val) => {
-                bug!("field access on non aggregate {:#?}, {:#?}", val, op.layout)
-            }
+            Immediate::Scalar(val) => span_bug!(
+                self.cur_span(),
+                "field access on non aggregate {:#?}, {:#?}",
+                val,
+                op.layout
+            ),
         };
         Ok(OpTy { op: Operand::Immediate(immediate), layout: field_layout })
     }
@@ -545,7 +548,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             ty::ConstKind::Infer(..)
             | ty::ConstKind::Bound(..)
             | ty::ConstKind::Placeholder(..) => {
-                bug!("eval_const_to_op: Unexpected ConstKind {:?}", val)
+                span_bug!(self.cur_span(), "eval_const_to_op: Unexpected ConstKind {:?}", val)
             }
             ty::ConstKind::Value(val_val) => val_val,
         };
@@ -656,7 +659,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                             .discriminants(def_id, *self.tcx)
                             .find(|(_, var)| var.val == discr_bits)
                     }
-                    _ => bug!("tagged layout for non-adt non-generator"),
+                    _ => span_bug!(self.cur_span(), "tagged layout for non-adt non-generator"),
                 }
                 .ok_or_else(|| err_ub!(InvalidTag(tag_val.erase_tag())))?;
                 // Return the cast value, and the index.