Point at impl and type defs introducing requirements on E0277

compiler/rustc_middle/src/ty/mod.rs

@@ -1598,7 +1598,7 @@ impl<'tcx> TyCtxt<'tcx> {
             .filter(|item| item.kind == AssocKind::Fn && item.defaultness.has_value())
     }
 
-    fn item_name_from_hir(self, def_id: DefId) -> Option<Ident> {
+    pub fn item_name_from_hir(self, def_id: DefId) -> Option<Ident> {
         self.hir().get_if_local(def_id).and_then(|node| node.ident())
     }
 

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -2070,7 +2070,14 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
 
                 // Don't print the tuple of capture types
                 if !is_upvar_tys_infer_tuple {
-                    err.note(&format!("required because it appears within the type `{}`", ty));
+                    let msg = format!("required because it appears within the type `{}`", ty);
+                    match ty.kind() {
+                        ty::Adt(def, _) => match self.tcx.item_name_from_hir(def.did) {
+                            Some(ident) => err.span_note(ident.span, &msg),
+                            None => err.note(&msg),
+                        },
+                        _ => err.note(&msg),
+                    };
                 }
 
                 obligated_types.push(ty);
@@ -2092,11 +2099,36 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
             ObligationCauseCode::ImplDerivedObligation(ref data) => {
                 let mut parent_trait_ref = self.resolve_vars_if_possible(data.parent_trait_ref);
                 let parent_def_id = parent_trait_ref.def_id();
-                err.note(&format!(
+                let msg = format!(
                     "required because of the requirements on the impl of `{}` for `{}`",
                     parent_trait_ref.print_only_trait_path(),
                     parent_trait_ref.skip_binder().self_ty()
-                ));
+                );
+                let mut candidates = vec![];
+                self.tcx.for_each_relevant_impl(
+                    parent_def_id,
+                    parent_trait_ref.self_ty().skip_binder(),
+                    |impl_def_id| {
+                        candidates.push(impl_def_id);
+                    },
+                );
+                match &candidates[..] {
+                    [def_id] => match self.tcx.hir().get_if_local(*def_id) {
+                        Some(Node::Item(hir::Item {
+                            kind: hir::ItemKind::Impl(hir::Impl { of_trait, self_ty, .. }),
+                            ..
+                        })) => {
+                            let mut spans = Vec::with_capacity(2);
+                            if let Some(trait_ref) = of_trait {
+                                spans.push(trait_ref.path.span);
+                            }
+                            spans.push(self_ty.span);
+                            err.span_note(spans, &msg)
+                        }
+                        _ => err.note(&msg),
+                    },
+                    _ => err.note(&msg),
+                };
 
                 let mut parent_predicate = parent_trait_ref.without_const().to_predicate(tcx);
                 let mut data = data;

src/test/ui/associated-types/impl-wf-cycle-1.stderr

@@ -10,7 +10,11 @@ LL | |
 LL | | }
    | |_^
    |
-   = note: required because of the requirements on the impl of `Grault` for `(T,)`
+note: required because of the requirements on the impl of `Grault` for `(T,)`
+  --> $DIR/impl-wf-cycle-1.rs:15:17
+   |
+LL | impl<T: Grault> Grault for (T,)
+   |                 ^^^^^^     ^^^^
    = note: 1 redundant requirements hidden
    = note: required because of the requirements on the impl of `Grault` for `(T,)`
 
@@ -20,7 +24,11 @@ error[E0275]: overflow evaluating the requirement `<(T,) as Grault>::A == _`
 LL |     type A = ();
    |     ^^^^^^^^^^^^
    |
-   = note: required because of the requirements on the impl of `Grault` for `(T,)`
+note: required because of the requirements on the impl of `Grault` for `(T,)`
+  --> $DIR/impl-wf-cycle-1.rs:15:17
+   |
+LL | impl<T: Grault> Grault for (T,)
+   |                 ^^^^^^     ^^^^
    = note: 1 redundant requirements hidden
    = note: required because of the requirements on the impl of `Grault` for `(T,)`
 
@@ -30,7 +38,11 @@ error[E0275]: overflow evaluating the requirement `<(T,) as Grault>::A == _`
 LL |     type B = bool;
    |     ^^^^^^^^^^^^^^
    |
-   = note: required because of the requirements on the impl of `Grault` for `(T,)`
+note: required because of the requirements on the impl of `Grault` for `(T,)`
+  --> $DIR/impl-wf-cycle-1.rs:15:17
+   |
+LL | impl<T: Grault> Grault for (T,)
+   |                 ^^^^^^     ^^^^
    = note: 1 redundant requirements hidden
    = note: required because of the requirements on the impl of `Grault` for `(T,)`
 

src/test/ui/associated-types/impl-wf-cycle-2.stderr

@@ -10,15 +10,23 @@ LL | |
 LL | | }
    | |_^
    |
-   = note: required because of the requirements on the impl of `Grault` for `(T,)`
+note: required because of the requirements on the impl of `Grault` for `(T,)`
+  --> $DIR/impl-wf-cycle-2.rs:7:17
+   |
+LL | impl<T: Grault> Grault for (T,)
+   |                 ^^^^^^     ^^^^
 
 error[E0275]: overflow evaluating the requirement `<(T,) as Grault>::A == _`
   --> $DIR/impl-wf-cycle-2.rs:11:5
    |
 LL |     type A = ();
    |     ^^^^^^^^^^^^
    |
-   = note: required because of the requirements on the impl of `Grault` for `(T,)`
+note: required because of the requirements on the impl of `Grault` for `(T,)`
+  --> $DIR/impl-wf-cycle-2.rs:7:17
+   |
+LL | impl<T: Grault> Grault for (T,)
+   |                 ^^^^^^     ^^^^
 
 error: aborting due to 2 previous errors
 

src/test/ui/associated-types/issue-44153.stderr

@@ -7,7 +7,11 @@ LL |     fn visit() {}
 LL |     <() as Visit>::visit();
    |     ^^^^^^^^^^^^^^^^^^^^ expected `&()`, found `()`
    |
-   = note: required because of the requirements on the impl of `Visit` for `()`
+note: required because of the requirements on the impl of `Visit` for `()`
+  --> $DIR/issue-44153.rs:13:10
+   |
+LL | impl<'a> Visit for () where
+   |          ^^^^^     ^^
 
 error: aborting due to previous error
 

src/test/ui/associated-types/issue-65774-1.stderr

@@ -13,7 +13,11 @@ error[E0277]: the trait bound `T: MyDisplay` is not satisfied
 LL |         let closure = |config: &mut <S as MPU>::MpuConfig| writer.my_write(&config);
    |                                                                            ^^^^^^^ the trait `MyDisplay` is not implemented for `T`
    |
-   = note: required because of the requirements on the impl of `MyDisplay` for `&mut T`
+note: required because of the requirements on the impl of `MyDisplay` for `&mut T`
+  --> $DIR/issue-65774-1.rs:5:24
+   |
+LL | impl<'a, T: MyDisplay> MyDisplay for &'a mut T { }
+   |                        ^^^^^^^^^     ^^^^^^^^^
    = note: required for the cast to the object type `dyn MyDisplay`
 
 error: aborting due to 2 previous errors

src/test/ui/async-await/issue-72590-type-error-sized.stderr

@@ -17,7 +17,11 @@ LL |     async fn frob(self) {}
    |                   ^^^^ doesn't have a size known at compile-time
    |
    = help: within `Foo`, the trait `Sized` is not implemented for `str`
-   = note: required because it appears within the type `Foo`
+note: required because it appears within the type `Foo`
+  --> $DIR/issue-72590-type-error-sized.rs:5:8
+   |
+LL | struct Foo {
+   |        ^^^
    = help: unsized fn params are gated as an unstable feature
 help: function arguments must have a statically known size, borrowed types always have a known size
    |

src/test/ui/async-await/pin-needed-to-poll-2.rs

@@ -0,0 +1,48 @@
+use std::{
+    future::Future,
+    pin::Pin,
+    marker::Unpin,
+    task::{Context, Poll},
+};
+
+struct Sleep(std::marker::PhantomPinned);
+
+impl Future for Sleep {
+    type Output = ();
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        Poll::Ready(())
+    }
+}
+
+impl Drop for Sleep {
+    fn drop(&mut self) {}
+}
+
+fn sleep() -> Sleep {
+    Sleep(std::marker::PhantomPinned)
+}
+
+
+struct MyFuture {
+    sleep: Sleep,
+}
+
+impl MyFuture {
+    fn new() -> Self {
+        Self {
+            sleep: sleep(),
+        }
+    }
+}
+
+impl Future for MyFuture {
+    type Output = ();
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        Pin::new(&mut self.sleep).poll(cx)
+        //~^ ERROR `PhantomPinned` cannot be unpinned
+    }
+}
+
+fn main() {}

src/test/ui/async-await/pin-needed-to-poll-2.stderr

@@ -0,0 +1,16 @@
+error[E0277]: `PhantomPinned` cannot be unpinned
+  --> $DIR/pin-needed-to-poll-2.rs:43:9
+   |
+LL |         Pin::new(&mut self.sleep).poll(cx)
+   |         ^^^^^^^^ within `Sleep`, the trait `Unpin` is not implemented for `PhantomPinned`
+   |
+note: required because it appears within the type `Sleep`
+  --> $DIR/pin-needed-to-poll-2.rs:8:8
+   |
+LL | struct Sleep(std::marker::PhantomPinned);
+   |        ^^^^^
+   = note: required by `Pin::<P>::new`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.

src/test/ui/block-result/issue-22645.stderr

@@ -6,7 +6,11 @@ LL |   b + 3
    |
    = help: the following implementations were found:
              <f64 as Scalar>
-   = note: required because of the requirements on the impl of `Add<{integer}>` for `Bob`
+note: required because of the requirements on the impl of `Add<{integer}>` for `Bob`
+  --> $DIR/issue-22645.rs:8:19
+   |
+LL | impl<RHS: Scalar> Add <RHS> for Bob {
+   |                   ^^^^^^^^^     ^^^
 
 error[E0308]: mismatched types
   --> $DIR/issue-22645.rs:15:3

src/test/ui/builtin-superkinds/builtin-superkinds-in-metadata.stderr

@@ -9,7 +9,11 @@ LL | impl <T:Sync+'static> RequiresRequiresShareAndSend for X<T> { }
 LL | pub trait RequiresRequiresShareAndSend : RequiresShare + Send { }
    |                                                          ---- required by this bound in `RequiresRequiresShareAndSend`
    |
-   = note: required because it appears within the type `X<T>`
+note: required because it appears within the type `X<T>`
+  --> $DIR/builtin-superkinds-in-metadata.rs:9:8
+   |
+LL | struct X<T>(T);
+   |        ^
 help: consider further restricting this bound
    |
 LL | impl <T:Sync+'static + std::marker::Send> RequiresRequiresShareAndSend for X<T> { }

src/test/ui/did_you_mean/recursion_limit.stderr

@@ -8,16 +8,56 @@ LL |     is_send::<A>();
    |     ^^^^^^^^^^^^
    |
    = help: consider adding a `#![recursion_limit="20"]` attribute to your crate (`recursion_limit`)
-   = note: required because it appears within the type `J`
-   = note: required because it appears within the type `I`
-   = note: required because it appears within the type `H`
-   = note: required because it appears within the type `G`
-   = note: required because it appears within the type `F`
-   = note: required because it appears within the type `E`
-   = note: required because it appears within the type `D`
-   = note: required because it appears within the type `C`
-   = note: required because it appears within the type `B`
-   = note: required because it appears within the type `A`
+note: required because it appears within the type `J`
+  --> $DIR/recursion_limit.rs:24:9
+   |
+LL | link! { J, K }
+   |         ^
+note: required because it appears within the type `I`
+  --> $DIR/recursion_limit.rs:23:9
+   |
+LL | link! { I, J }
+   |         ^
+note: required because it appears within the type `H`
+  --> $DIR/recursion_limit.rs:22:9
+   |
+LL | link! { H, I }
+   |         ^
+note: required because it appears within the type `G`
+  --> $DIR/recursion_limit.rs:21:9
+   |
+LL | link! { G, H }
+   |         ^
+note: required because it appears within the type `F`
+  --> $DIR/recursion_limit.rs:20:9
+   |
+LL | link! { F, G }
+   |         ^
+note: required because it appears within the type `E`
+  --> $DIR/recursion_limit.rs:19:9
+   |
+LL | link! { E, F }
+   |         ^
+note: required because it appears within the type `D`
+  --> $DIR/recursion_limit.rs:18:9
+   |
+LL | link! { D, E }
+   |         ^
+note: required because it appears within the type `C`
+  --> $DIR/recursion_limit.rs:17:9
+   |
+LL | link! { C, D }
+   |         ^
+note: required because it appears within the type `B`
+  --> $DIR/recursion_limit.rs:16:9
+   |
+LL | link! { B, C }
+   |         ^
+note: required because it appears within the type `A`
+  --> $DIR/recursion_limit.rs:15:9
+   |
+LL | link! { A, B }
+   |         ^
 
 error: aborting due to previous error
 

src/test/ui/dst/dst-bad-deep.stderr

@@ -5,8 +5,16 @@ LL |     let h: &Fat<Fat<[isize]>> = &Fat { ptr: *g };
    |                                  ^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: within `Fat<Fat<[isize]>>`, the trait `Sized` is not implemented for `[isize]`
-   = note: required because it appears within the type `Fat<[isize]>`
-   = note: required because it appears within the type `Fat<Fat<[isize]>>`
+note: required because it appears within the type `Fat<[isize]>`
+  --> $DIR/dst-bad-deep.rs:6:8
+   |
+LL | struct Fat<T: ?Sized> {
+   |        ^^^
+note: required because it appears within the type `Fat<Fat<[isize]>>`
+  --> $DIR/dst-bad-deep.rs:6:8
+   |
+LL | struct Fat<T: ?Sized> {
+   |        ^^^
    = note: structs must have a statically known size to be initialized
 
 error: aborting due to previous error

src/test/ui/error-codes/E0275.stderr

@@ -8,7 +8,11 @@ LL | impl<T> Foo for T where Bar<T>: Foo {}
    |                                 ^^^
    |
    = help: consider adding a `#![recursion_limit="256"]` attribute to your crate (`E0275`)
-   = note: required because of the requirements on the impl of `Foo` for `Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<T>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
+note: required because of the requirements on the impl of `Foo` for `Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<Bar<T>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>`
+  --> $DIR/E0275.rs:5:9
+   |
+LL | impl<T> Foo for T where Bar<T>: Foo {}
+   |         ^^^     ^
    = note: 127 redundant requirements hidden
    = note: required because of the requirements on the impl of `Foo` for `Bar<T>`
 

src/test/ui/error-codes/E0277-2.stderr

@@ -8,9 +8,21 @@ LL |     is_send::<Foo>();
    |     ^^^^^^^^^^^^^^ `*const u8` cannot be sent between threads safely
    |
    = help: within `Foo`, the trait `Send` is not implemented for `*const u8`
-   = note: required because it appears within the type `Baz`
-   = note: required because it appears within the type `Bar`
-   = note: required because it appears within the type `Foo`
+note: required because it appears within the type `Baz`
+  --> $DIR/E0277-2.rs:9:8
+   |
+LL | struct Baz {
+   |        ^^^
+note: required because it appears within the type `Bar`
+  --> $DIR/E0277-2.rs:5:8
+   |
+LL | struct Bar {
+   |        ^^^
+note: required because it appears within the type `Foo`
+  --> $DIR/E0277-2.rs:1:8
+   |
+LL | struct Foo {
+   |        ^^^
 
 error: aborting due to previous error
 

src/test/ui/extern/extern-types-unsized.stderr

@@ -23,7 +23,11 @@ LL |     assert_sized::<Foo>();
    |     ^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: within `Foo`, the trait `Sized` is not implemented for `A`
-   = note: required because it appears within the type `Foo`
+note: required because it appears within the type `Foo`
+  --> $DIR/extern-types-unsized.rs:9:8
+   |
+LL | struct Foo {
+   |        ^^^
 help: consider relaxing the implicit `Sized` restriction
    |
 LL | fn assert_sized<T: ?Sized>() {}
@@ -39,7 +43,11 @@ LL |     assert_sized::<Bar<A>>();
    |     ^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: within `Bar<A>`, the trait `Sized` is not implemented for `A`
-   = note: required because it appears within the type `Bar<A>`
+note: required because it appears within the type `Bar<A>`
+  --> $DIR/extern-types-unsized.rs:14:8
+   |
+LL | struct Bar<T: ?Sized> {
+   |        ^^^
 help: consider relaxing the implicit `Sized` restriction
    |
 LL | fn assert_sized<T: ?Sized>() {}
@@ -55,8 +63,16 @@ LL |     assert_sized::<Bar<Bar<A>>>();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: within `Bar<Bar<A>>`, the trait `Sized` is not implemented for `A`
-   = note: required because it appears within the type `Bar<A>`
-   = note: required because it appears within the type `Bar<Bar<A>>`
+note: required because it appears within the type `Bar<A>`
+  --> $DIR/extern-types-unsized.rs:14:8
+   |
+LL | struct Bar<T: ?Sized> {
+   |        ^^^
+note: required because it appears within the type `Bar<Bar<A>>`
+  --> $DIR/extern-types-unsized.rs:14:8
+   |
+LL | struct Bar<T: ?Sized> {
+   |        ^^^
 help: consider relaxing the implicit `Sized` restriction
    |
 LL | fn assert_sized<T: ?Sized>() {}

src/test/ui/feature-gates/feature-gate-trivial_bounds.stderr

@@ -107,7 +107,11 @@ LL | | }
    | |_^ doesn't have a size known at compile-time
    |
    = help: within `Dst<(dyn A + 'static)>`, the trait `Sized` is not implemented for `(dyn A + 'static)`
-   = note: required because it appears within the type `Dst<(dyn A + 'static)>`
+note: required because it appears within the type `Dst<(dyn A + 'static)>`
+  --> $DIR/feature-gate-trivial_bounds.rs:48:8
+   |
+LL | struct Dst<X: ?Sized> {
+   |        ^^^
    = help: see issue #48214
    = help: add `#![feature(trivial_bounds)]` to the crate attributes to enable
 

src/test/ui/hrtb/issue-62203-hrtb-ice.stderr

@@ -15,7 +15,11 @@ error[E0271]: type mismatch resolving `<[closure@$DIR/issue-62203-hrtb-ice.rs:42
 LL |     let v = Unit2.m(
    |                   ^ expected struct `Unit4`, found struct `Unit3`
    |
-   = note: required because of the requirements on the impl of `for<'r> T0<'r, (<Unit2 as Ty<'r>>::V,)>` for `L<[closure@$DIR/issue-62203-hrtb-ice.rs:42:17: 42:39]>`
+note: required because of the requirements on the impl of `for<'r> T0<'r, (<Unit2 as Ty<'r>>::V,)>` for `L<[closure@$DIR/issue-62203-hrtb-ice.rs:42:17: 42:39]>`
+  --> $DIR/issue-62203-hrtb-ice.rs:17:16
+   |
+LL | impl<'a, A, T> T0<'a, A> for L<T>
+   |                ^^^^^^^^^     ^^^^
 
 error: aborting due to 2 previous errors
 

src/test/ui/issues/issue-18400.stderr

@@ -5,7 +5,11 @@ LL |     0.contains(bits);
    |       ^^^^^^^^
    |
    = help: consider adding a `#![recursion_limit="256"]` attribute to your crate (`issue_18400`)
-   = note: required because of the requirements on the impl of `Set<&[_]>` for `{integer}`
+note: required because of the requirements on the impl of `Set<&[_]>` for `{integer}`
+  --> $DIR/issue-18400.rs:6:16
+   |
+LL | impl<'a, T, S> Set<&'a [T]> for S where
+   |                ^^^^^^^^^^^^     ^
    = note: 128 redundant requirements hidden
    = note: required because of the requirements on the impl of `Set<&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[&[_]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]>` for `{integer}`
 

src/test/ui/issues/issue-22872.stderr

@@ -5,7 +5,11 @@ LL |     let _: Box<dyn for<'b> Wrap<'b>> = Box::new(Wrapper(process));
    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^ `<P as Process<'_>>::Item` is not an iterator
    |
    = help: the trait `Iterator` is not implemented for `<P as Process<'_>>::Item`
-   = note: required because of the requirements on the impl of `for<'b> Wrap<'b>` for `Wrapper<P>`
+note: required because of the requirements on the impl of `for<'b> Wrap<'b>` for `Wrapper<P>`
+  --> $DIR/issue-22872.rs:7:13
+   |
+LL | impl<'b, P> Wrap<'b> for Wrapper<P>
+   |             ^^^^^^^^     ^^^^^^^^^^
    = note: required for the cast to the object type `dyn for<'b> Wrap<'b>`
 help: consider further restricting the associated type
    |

src/test/ui/issues/issue-23122-2.stderr

@@ -5,7 +5,11 @@ LL |     type Next = <GetNext<T::Next> as Next>::Next;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: consider adding a `#![recursion_limit="256"]` attribute to your crate (`issue_23122_2`)
-   = note: required because of the requirements on the impl of `Next` for `GetNext<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<T as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next>`
+note: required because of the requirements on the impl of `Next` for `GetNext<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<T as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next as Next>::Next>`
+  --> $DIR/issue-23122-2.rs:8:15
+   |
+LL | impl<T: Next> Next for GetNext<T> {
+   |               ^^^^     ^^^^^^^^^^
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-38821.stderr

@@ -4,7 +4,11 @@ error[E0277]: the trait bound `<Col as Expression>::SqlType: NotNull` is not sat
 LL | #[derive(Debug, Copy, Clone)]
    |                 ^^^^ the trait `NotNull` is not implemented for `<Col as Expression>::SqlType`
    |
-   = note: required because of the requirements on the impl of `IntoNullable` for `<Col as Expression>::SqlType`
+note: required because of the requirements on the impl of `IntoNullable` for `<Col as Expression>::SqlType`
+  --> $DIR/issue-38821.rs:9:18
+   |
+LL | impl<T: NotNull> IntoNullable for T {
+   |                  ^^^^^^^^^^^^     ^
    = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to previous error

src/test/ui/issues/issue-39970.stderr

@@ -7,7 +7,11 @@ LL |     fn visit() {}
 LL |     <() as Visit>::visit();
    |     ^^^^^^^^^^^^^^^^^^^^ expected `()`, found `&()`
    |
-   = note: required because of the requirements on the impl of `Visit` for `()`
+note: required because of the requirements on the impl of `Visit` for `()`
+  --> $DIR/issue-39970.rs:13:6
+   |
+LL | impl Visit for () where
+   |      ^^^^^     ^^
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-40827.stderr

@@ -8,9 +8,17 @@ LL |     f(Foo(Arc::new(Bar::B(None))));
    |     ^ `Rc<Foo>` cannot be shared between threads safely
    |
    = help: within `Bar`, the trait `Sync` is not implemented for `Rc<Foo>`
-   = note: required because it appears within the type `Bar`
+note: required because it appears within the type `Bar`
+  --> $DIR/issue-40827.rs:6:6
+   |
+LL | enum Bar {
+   |      ^^^
    = note: required because of the requirements on the impl of `Send` for `Arc<Bar>`
-   = note: required because it appears within the type `Foo`
+note: required because it appears within the type `Foo`
+  --> $DIR/issue-40827.rs:4:8
+   |
+LL | struct Foo(Arc<Bar>);
+   |        ^^^
 
 error[E0277]: `Rc<Foo>` cannot be sent between threads safely
   --> $DIR/issue-40827.rs:14:5
@@ -22,9 +30,17 @@ LL |     f(Foo(Arc::new(Bar::B(None))));
    |     ^ `Rc<Foo>` cannot be sent between threads safely
    |
    = help: within `Bar`, the trait `Send` is not implemented for `Rc<Foo>`
-   = note: required because it appears within the type `Bar`
+note: required because it appears within the type `Bar`
+  --> $DIR/issue-40827.rs:6:6
+   |
+LL | enum Bar {
+   |      ^^^
    = note: required because of the requirements on the impl of `Send` for `Arc<Bar>`
-   = note: required because it appears within the type `Foo`
+note: required because it appears within the type `Foo`
+  --> $DIR/issue-40827.rs:4:8
+   |
+LL | struct Foo(Arc<Bar>);
+   |        ^^^
 
 error: aborting due to 2 previous errors
 

src/test/ui/issues/issue-5883.stderr

@@ -21,7 +21,11 @@ LL |     Struct { r: r }
    |     --------------- this returned value is of type `Struct`
    |
    = help: within `Struct`, the trait `Sized` is not implemented for `(dyn A + 'static)`
-   = note: required because it appears within the type `Struct`
+note: required because it appears within the type `Struct`
+  --> $DIR/issue-5883.rs:3:8
+   |
+LL | struct Struct {
+   |        ^^^^^^
    = note: the return type of a function must have a statically known size
 
 error: aborting due to 2 previous errors

src/test/ui/issues/issue-7013.stderr

@@ -6,7 +6,11 @@ LL |     let a = A {v: box B{v: None} as Box<dyn Foo + Send>};
    |
    = help: within `B`, the trait `Send` is not implemented for `Rc<RefCell<A>>`
    = note: required because it appears within the type `Option<Rc<RefCell<A>>>`
-   = note: required because it appears within the type `B`
+note: required because it appears within the type `B`
+  --> $DIR/issue-7013.rs:10:8
+   |
+LL | struct B {
+   |        ^
    = note: required for the cast to the object type `dyn Foo + Send`
 
 error: aborting due to previous error

src/test/ui/kindck/kindck-impl-type-params-2.stderr

@@ -7,7 +7,11 @@ LL | fn take_param<T:Foo>(foo: &T) { }
 LL |     take_param(&x);
    |                ^^ the trait `Copy` is not implemented for `Box<{integer}>`
    |
-   = note: required because of the requirements on the impl of `Foo` for `Box<{integer}>`
+note: required because of the requirements on the impl of `Foo` for `Box<{integer}>`
+  --> $DIR/kindck-impl-type-params-2.rs:6:14
+   |
+LL | impl<T:Copy> Foo for T {
+   |              ^^^     ^
 
 error: aborting due to previous error
 

src/test/ui/kindck/kindck-impl-type-params.stderr

@@ -4,7 +4,11 @@ error[E0277]: `T` cannot be sent between threads safely
 LL |     let a = &t as &dyn Gettable<T>;
    |             ^^ `T` cannot be sent between threads safely
    |
-   = note: required because of the requirements on the impl of `Gettable<T>` for `S<T>`
+note: required because of the requirements on the impl of `Gettable<T>` for `S<T>`
+  --> $DIR/kindck-impl-type-params.rs:14:32
+   |
+LL | impl<T: Send + Copy + 'static> Gettable<T> for S<T> {}
+   |                                ^^^^^^^^^^^     ^^^^
    = note: required for the cast to the object type `dyn Gettable<T>`
 help: consider restricting type parameter `T`
    |
@@ -17,7 +21,11 @@ error[E0277]: the trait bound `T: Copy` is not satisfied
 LL |     let a = &t as &dyn Gettable<T>;
    |             ^^ the trait `Copy` is not implemented for `T`
    |
-   = note: required because of the requirements on the impl of `Gettable<T>` for `S<T>`
+note: required because of the requirements on the impl of `Gettable<T>` for `S<T>`
+  --> $DIR/kindck-impl-type-params.rs:14:32
+   |
+LL | impl<T: Send + Copy + 'static> Gettable<T> for S<T> {}
+   |                                ^^^^^^^^^^^     ^^^^
    = note: required for the cast to the object type `dyn Gettable<T>`
 help: consider restricting type parameter `T`
    |
@@ -30,7 +38,11 @@ error[E0277]: `T` cannot be sent between threads safely
 LL |     let a: &dyn Gettable<T> = &t;
    |                               ^^ `T` cannot be sent between threads safely
    |
-   = note: required because of the requirements on the impl of `Gettable<T>` for `S<T>`
+note: required because of the requirements on the impl of `Gettable<T>` for `S<T>`
+  --> $DIR/kindck-impl-type-params.rs:14:32
+   |
+LL | impl<T: Send + Copy + 'static> Gettable<T> for S<T> {}
+   |                                ^^^^^^^^^^^     ^^^^
    = note: required for the cast to the object type `dyn Gettable<T>`
 help: consider restricting type parameter `T`
    |
@@ -43,7 +55,11 @@ error[E0277]: the trait bound `T: Copy` is not satisfied
 LL |     let a: &dyn Gettable<T> = &t;
    |                               ^^ the trait `Copy` is not implemented for `T`
    |
-   = note: required because of the requirements on the impl of `Gettable<T>` for `S<T>`
+note: required because of the requirements on the impl of `Gettable<T>` for `S<T>`
+  --> $DIR/kindck-impl-type-params.rs:14:32
+   |
+LL | impl<T: Send + Copy + 'static> Gettable<T> for S<T> {}
+   |                                ^^^^^^^^^^^     ^^^^
    = note: required for the cast to the object type `dyn Gettable<T>`
 help: consider restricting type parameter `T`
    |
@@ -64,7 +80,11 @@ error[E0277]: the trait bound `String: Copy` is not satisfied
 LL |     let a = t as Box<dyn Gettable<String>>;
    |             ^ the trait `Copy` is not implemented for `String`
    |
-   = note: required because of the requirements on the impl of `Gettable<String>` for `S<String>`
+note: required because of the requirements on the impl of `Gettable<String>` for `S<String>`
+  --> $DIR/kindck-impl-type-params.rs:14:32
+   |
+LL | impl<T: Send + Copy + 'static> Gettable<T> for S<T> {}
+   |                                ^^^^^^^^^^^     ^^^^
    = note: required for the cast to the object type `dyn Gettable<String>`
 
 error[E0277]: the trait bound `Foo: Copy` is not satisfied
@@ -73,7 +93,11 @@ error[E0277]: the trait bound `Foo: Copy` is not satisfied
 LL |     let a: Box<dyn Gettable<Foo>> = t;
    |                                     ^ the trait `Copy` is not implemented for `Foo`
    |
-   = note: required because of the requirements on the impl of `Gettable<Foo>` for `S<Foo>`
+note: required because of the requirements on the impl of `Gettable<Foo>` for `S<Foo>`
+  --> $DIR/kindck-impl-type-params.rs:14:32
+   |
+LL | impl<T: Send + Copy + 'static> Gettable<T> for S<T> {}
+   |                                ^^^^^^^^^^^     ^^^^
    = note: required for the cast to the object type `dyn Gettable<Foo>`
 
 error: aborting due to 7 previous errors

src/test/ui/kindck/kindck-inherited-copy-bound.curr.stderr

@@ -7,7 +7,11 @@ LL | fn take_param<T:Foo>(foo: &T) { }
 LL |     take_param(&x);
    |                ^^ the trait `Copy` is not implemented for `Box<{integer}>`
    |
-   = note: required because of the requirements on the impl of `Foo` for `Box<{integer}>`
+note: required because of the requirements on the impl of `Foo` for `Box<{integer}>`
+  --> $DIR/kindck-inherited-copy-bound.rs:14:14
+   |
+LL | impl<T:Copy> Foo for T {
+   |              ^^^     ^
 
 error[E0038]: the trait `Foo` cannot be made into an object
   --> $DIR/kindck-inherited-copy-bound.rs:28:19

src/test/ui/kindck/kindck-inherited-copy-bound.object_safe_for_dispatch.stderr

@@ -7,7 +7,11 @@ LL | fn take_param<T:Foo>(foo: &T) { }
 LL |     take_param(&x);
    |                ^^ the trait `Copy` is not implemented for `Box<{integer}>`
    |
-   = note: required because of the requirements on the impl of `Foo` for `Box<{integer}>`
+note: required because of the requirements on the impl of `Foo` for `Box<{integer}>`
+  --> $DIR/kindck-inherited-copy-bound.rs:14:14
+   |
+LL | impl<T:Copy> Foo for T {
+   |              ^^^     ^
 
 error[E0038]: the trait `Foo` cannot be made into an object
   --> $DIR/kindck-inherited-copy-bound.rs:28:13

src/test/ui/mut/mutable-enum-indirect.stderr

@@ -8,7 +8,11 @@ LL |     bar(&x);
    |     ^^^ `NoSync` cannot be shared between threads safely
    |
    = help: within `&Foo`, the trait `Sync` is not implemented for `NoSync`
-   = note: required because it appears within the type `Foo`
+note: required because it appears within the type `Foo`
+  --> $DIR/mutable-enum-indirect.rs:11:6
+   |
+LL | enum Foo { A(NoSync) }
+   |      ^^^
    = note: required because it appears within the type `&Foo`
 
 error: aborting due to previous error

src/test/ui/no-send-res-ports.stderr

@@ -17,8 +17,16 @@ LL |       F: Send + 'static,
    |          ---- required by this bound in `spawn`
    |
    = help: within `[closure@$DIR/no-send-res-ports.rs:25:19: 29:6]`, the trait `Send` is not implemented for `Rc<()>`
-   = note: required because it appears within the type `Port<()>`
-   = note: required because it appears within the type `Foo`
+note: required because it appears within the type `Port<()>`
+  --> $DIR/no-send-res-ports.rs:5:8
+   |
+LL | struct Port<T>(Rc<T>);
+   |        ^^^^
+note: required because it appears within the type `Foo`
+  --> $DIR/no-send-res-ports.rs:9:12
+   |
+LL |     struct Foo {
+   |            ^^^
    = note: required because it appears within the type `[closure@$DIR/no-send-res-ports.rs:25:19: 29:6]`
 
 error: aborting due to previous error

src/test/ui/no_send-enum.stderr

@@ -8,7 +8,11 @@ LL |     bar(x);
    |     ^^^ `NoSend` cannot be sent between threads safely
    |
    = help: within `Foo`, the trait `Send` is not implemented for `NoSend`
-   = note: required because it appears within the type `Foo`
+note: required because it appears within the type `Foo`
+  --> $DIR/no_send-enum.rs:8:6
+   |
+LL | enum Foo {
+   |      ^^^
 
 error: aborting due to previous error
 

src/test/ui/no_share-enum.stderr

@@ -8,7 +8,11 @@ LL |     bar(x);
    |     ^^^ `NoSync` cannot be shared between threads safely
    |
    = help: within `Foo`, the trait `Sync` is not implemented for `NoSync`
-   = note: required because it appears within the type `Foo`
+note: required because it appears within the type `Foo`
+  --> $DIR/no_share-enum.rs:8:6
+   |
+LL | enum Foo { A(NoSync) }
+   |      ^^^
 
 error: aborting due to previous error
 

src/test/ui/phantom-auto-trait.stderr

@@ -7,9 +7,17 @@ LL | fn is_zen<T: Zen>(_: T) {}
 LL |     is_zen(x)
    |            ^ `T` cannot be shared between threads safely
    |
-   = note: required because of the requirements on the impl of `Zen` for `&T`
+note: required because of the requirements on the impl of `Zen` for `&T`
+  --> $DIR/phantom-auto-trait.rs:10:24
+   |
+LL | unsafe impl<'a, T: 'a> Zen for &'a T where T: Sync {}
+   |                        ^^^     ^^^^^
    = note: required because it appears within the type `PhantomData<&T>`
-   = note: required because it appears within the type `Guard<'_, T>`
+note: required because it appears within the type `Guard<'_, T>`
+  --> $DIR/phantom-auto-trait.rs:12:8
+   |
+LL | struct Guard<'a, T: 'a> {
+   |        ^^^^^
 help: consider restricting type parameter `T`
    |
 LL | fn not_sync<T: std::marker::Sync>(x: Guard<T>) {
@@ -24,10 +32,22 @@ LL | fn is_zen<T: Zen>(_: T) {}
 LL |     is_zen(x)
    |            ^ `T` cannot be shared between threads safely
    |
-   = note: required because of the requirements on the impl of `Zen` for `&T`
+note: required because of the requirements on the impl of `Zen` for `&T`
+  --> $DIR/phantom-auto-trait.rs:10:24
+   |
+LL | unsafe impl<'a, T: 'a> Zen for &'a T where T: Sync {}
+   |                        ^^^     ^^^^^
    = note: required because it appears within the type `PhantomData<&T>`
-   = note: required because it appears within the type `Guard<'_, T>`
-   = note: required because it appears within the type `Nested<Guard<'_, T>>`
+note: required because it appears within the type `Guard<'_, T>`
+  --> $DIR/phantom-auto-trait.rs:12:8
+   |
+LL | struct Guard<'a, T: 'a> {
+   |        ^^^^^
+note: required because it appears within the type `Nested<Guard<'_, T>>`
+  --> $DIR/phantom-auto-trait.rs:16:8
+   |
+LL | struct Nested<T>(T);
+   |        ^^^^^^
 help: consider restricting type parameter `T`
    |
 LL | fn nested_not_sync<T: std::marker::Sync>(x: Nested<Guard<T>>) {

src/test/ui/recursion/recursive-requirements.stderr

@@ -8,7 +8,11 @@ LL |     let _: AssertSync<Foo> = unimplemented!();
    |            ^^^^^^^^^^^^^^^ `*const Bar` cannot be shared between threads safely
    |
    = help: within `Foo`, the trait `Sync` is not implemented for `*const Bar`
-   = note: required because it appears within the type `Foo`
+note: required because it appears within the type `Foo`
+  --> $DIR/recursive-requirements.rs:5:12
+   |
+LL | pub struct Foo {
+   |            ^^^
 
 error[E0277]: `*const Foo` cannot be shared between threads safely
   --> $DIR/recursive-requirements.rs:16:12
@@ -20,9 +24,17 @@ LL |     let _: AssertSync<Foo> = unimplemented!();
    |            ^^^^^^^^^^^^^^^ `*const Foo` cannot be shared between threads safely
    |
    = help: within `Foo`, the trait `Sync` is not implemented for `*const Foo`
-   = note: required because it appears within the type `Bar`
+note: required because it appears within the type `Bar`
+  --> $DIR/recursive-requirements.rs:10:12
+   |
+LL | pub struct Bar {
+   |            ^^^
    = note: required because it appears within the type `PhantomData<Bar>`
-   = note: required because it appears within the type `Foo`
+note: required because it appears within the type `Foo`
+  --> $DIR/recursive-requirements.rs:5:12
+   |
+LL | pub struct Foo {
+   |            ^^^
 
 error: aborting due to 2 previous errors
 

src/test/ui/specialization/issue-38091-2.stderr

@@ -10,7 +10,11 @@ LL | #![feature(specialization)]
 
 error[E0275]: overflow evaluating the requirement `i32: Check`
    |
-   = note: required because of the requirements on the impl of `Iterate` for `i32`
+note: required because of the requirements on the impl of `Iterate` for `i32`
+  --> $DIR/issue-38091-2.rs:11:13
+   |
+LL | impl<'a, T> Iterate<'a> for T
+   |             ^^^^^^^^^^^     ^
 
 error: aborting due to previous error; 1 warning emitted
 

src/test/ui/specialization/issue-39448.stderr

@@ -14,8 +14,16 @@ error[E0275]: overflow evaluating the requirement `T: FromA<U>`
 LL |     x.foo(y.to()).to()
    |             ^^
    |
-   = note: required because of the requirements on the impl of `FromA<U>` for `T`
-   = note: required because of the requirements on the impl of `ToA<T>` for `U`
+note: required because of the requirements on the impl of `FromA<U>` for `T`
+  --> $DIR/issue-39448.rs:24:29
+   |
+LL | impl<T: A, U: A + FromA<T>> FromA<T> for U {
+   |                             ^^^^^^^^     ^
+note: required because of the requirements on the impl of `ToA<T>` for `U`
+  --> $DIR/issue-39448.rs:34:12
+   |
+LL | impl<T, U> ToA<U> for T
+   |            ^^^^^^     ^
 
 error: aborting due to previous error; 1 warning emitted
 

src/test/ui/substs-ppaux.normal.stderr

@@ -80,7 +80,11 @@ LL |     <str as Foo<u8>>::bar;
    |     ^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `str`
-   = note: required because of the requirements on the impl of `Foo<'_, '_, u8>` for `str`
+note: required because of the requirements on the impl of `Foo<'_, '_, u8>` for `str`
+  --> $DIR/substs-ppaux.rs:11:17
+   |
+LL | impl<'a,'b,T,S> Foo<'a, 'b, S> for T {}
+   |                 ^^^^^^^^^^^^^^     ^
 
 error: aborting due to 5 previous errors
 

src/test/ui/substs-ppaux.verbose.stderr

@@ -80,7 +80,11 @@ LL |     <str as Foo<u8>>::bar;
    |     ^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `str`
-   = note: required because of the requirements on the impl of `Foo<'_#0r, '_#1r, u8>` for `str`
+note: required because of the requirements on the impl of `Foo<'_#0r, '_#1r, u8>` for `str`
+  --> $DIR/substs-ppaux.rs:11:17
+   |
+LL | impl<'a,'b,T,S> Foo<'a, 'b, S> for T {}
+   |                 ^^^^^^^^^^^^^^     ^
 
 error: aborting due to 5 previous errors
 

src/test/ui/traits/cycle-cache-err-60010.stderr

@@ -10,9 +10,21 @@ LL |     SourceDatabase::parse(db);
    = note: required because it appears within the type `*const SalsaStorage`
    = note: required because it appears within the type `Unique<SalsaStorage>`
    = note: required because it appears within the type `Box<SalsaStorage>`
-   = note: required because it appears within the type `Runtime<RootDatabase>`
-   = note: required because it appears within the type `RootDatabase`
-   = note: required because of the requirements on the impl of `SourceDatabase` for `RootDatabase`
+note: required because it appears within the type `Runtime<RootDatabase>`
+  --> $DIR/cycle-cache-err-60010.rs:23:8
+   |
+LL | struct Runtime<DB: Database> {
+   |        ^^^^^^^
+note: required because it appears within the type `RootDatabase`
+  --> $DIR/cycle-cache-err-60010.rs:20:8
+   |
+LL | struct RootDatabase {
+   |        ^^^^^^^^^^^^
+note: required because of the requirements on the impl of `SourceDatabase` for `RootDatabase`
+  --> $DIR/cycle-cache-err-60010.rs:43:9
+   |
+LL | impl<T> SourceDatabase for T
+   |         ^^^^^^^^^^^^^^     ^
 
 error: aborting due to previous error
 

src/test/ui/traits/inductive-overflow/lifetime.rs

@@ -16,7 +16,7 @@ struct C<'a>(&'a ());
 struct X<T: Y>(T::P);
 
 impl<T: NotAuto> NotAuto for Box<T> {}
-impl<T: Y> NotAuto for X<T> where T::P: NotAuto {}
+impl<T: Y> NotAuto for X<T> where T::P: NotAuto {} //~ NOTE: required
 impl<'a> NotAuto for C<'a> {}
 
 fn is_send<S: NotAuto>() {}
@@ -26,5 +26,4 @@ fn main() {
     // Should only be a few notes.
     is_send::<X<C<'static>>>();
     //~^ ERROR overflow evaluating
-    //~| NOTE: required
 }

src/test/ui/traits/inductive-overflow/lifetime.stderr

@@ -7,7 +7,11 @@ LL | fn is_send<S: NotAuto>() {}
 LL |     is_send::<X<C<'static>>>();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: required because of the requirements on the impl of `NotAuto` for `X<C<'static>>`
+note: required because of the requirements on the impl of `NotAuto` for `X<C<'static>>`
+  --> $DIR/lifetime.rs:19:12
+   |
+LL | impl<T: Y> NotAuto for X<T> where T::P: NotAuto {}
+   |            ^^^^^^^     ^^^^
 
 error: aborting due to previous error
 

src/test/ui/traits/inductive-overflow/simultaneous.stderr

@@ -7,7 +7,11 @@ LL | fn is_ee<T: Combo>(t: T) {
 LL |     is_ee(4);
    |     ^^^^^
    |
-   = note: required because of the requirements on the impl of `Combo` for `{integer}`
+note: required because of the requirements on the impl of `Combo` for `{integer}`
+  --> $DIR/simultaneous.rs:11:34
+   |
+LL | impl<T: Tweedledee + Tweedledum> Combo for T {}
+   |                                  ^^^^^     ^
 
 error: aborting due to previous error
 

src/test/ui/traits/inductive-overflow/supertrait.stderr

@@ -7,7 +7,11 @@ LL | fn copy<T: Magic>(x: T) -> (T, T) { (x, x) }
 LL |     let (a, b) = copy(NoClone);
    |                  ^^^^
    |
-   = note: required because of the requirements on the impl of `Magic` for `NoClone`
+note: required because of the requirements on the impl of `Magic` for `NoClone`
+  --> $DIR/supertrait.rs:5:16
+   |
+LL | impl<T: Magic> Magic for T {}
+   |                ^^^^^     ^
 
 error: aborting due to previous error
 

src/test/ui/traits/negative-impls/negated-auto-traits-error.stderr

@@ -69,7 +69,11 @@ LL |     is_send(Box::new(Outer2(TestType)));
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^ `dummy3::TestType` cannot be sent between threads safely
    |
    = help: within `Outer2<dummy3::TestType>`, the trait `Send` is not implemented for `dummy3::TestType`
-   = note: required because it appears within the type `Outer2<dummy3::TestType>`
+note: required because it appears within the type `Outer2<dummy3::TestType>`
+  --> $DIR/negated-auto-traits-error.rs:12:8
+   |
+LL | struct Outer2<T>(T);
+   |        ^^^^^^
    = note: required because of the requirements on the impl of `Send` for `Unique<Outer2<dummy3::TestType>>`
    = note: required because it appears within the type `Box<Outer2<dummy3::TestType>>`
 
@@ -86,7 +90,11 @@ LL |     is_sync(Outer2(TestType));
    |             help: consider borrowing here: `&Outer2(TestType)`
    |
    = note: the trait bound `main::TestType: Sync` is not satisfied
-   = note: required because of the requirements on the impl of `Sync` for `Outer2<main::TestType>`
+note: required because of the requirements on the impl of `Sync` for `Outer2<main::TestType>`
+  --> $DIR/negated-auto-traits-error.rs:14:22
+   |
+LL | unsafe impl<T: Send> Sync for Outer2<T> {}
+   |                      ^^^^     ^^^^^^^^^
 
 error: aborting due to 7 previous errors
 

src/test/ui/traits/suggest-where-clause.stderr

@@ -26,7 +26,11 @@ LL |     mem::size_of::<Misc<U>>();
 LL | pub const fn size_of<T>() -> usize {
    |                      - required by this bound in `std::mem::size_of`
    |
-   = note: required because it appears within the type `Misc<U>`
+note: required because it appears within the type `Misc<U>`
+  --> $DIR/suggest-where-clause.rs:3:8
+   |
+LL | struct Misc<T:?Sized>(T);
+   |        ^^^^
 
 error[E0277]: the trait bound `u64: From<T>` is not satisfied
   --> $DIR/suggest-where-clause.rs:15:5

src/test/ui/typeck/typeck-default-trait-impl-negation-sync.stderr

@@ -19,7 +19,11 @@ LL |     is_sync::<MyTypeWUnsafe>();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^ `UnsafeCell<u8>` cannot be shared between threads safely
    |
    = help: within `MyTypeWUnsafe`, the trait `Sync` is not implemented for `UnsafeCell<u8>`
-   = note: required because it appears within the type `MyTypeWUnsafe`
+note: required because it appears within the type `MyTypeWUnsafe`
+  --> $DIR/typeck-default-trait-impl-negation-sync.rs:21:8
+   |
+LL | struct MyTypeWUnsafe {
+   |        ^^^^^^^^^^^^^
 
 error[E0277]: `Managed` cannot be shared between threads safely
   --> $DIR/typeck-default-trait-impl-negation-sync.rs:39:5
@@ -31,7 +35,11 @@ LL |     is_sync::<MyTypeManaged>();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^ `Managed` cannot be shared between threads safely
    |
    = help: within `MyTypeManaged`, the trait `Sync` is not implemented for `Managed`
-   = note: required because it appears within the type `MyTypeManaged`
+note: required because it appears within the type `MyTypeManaged`
+  --> $DIR/typeck-default-trait-impl-negation-sync.rs:25:8
+   |
+LL | struct MyTypeManaged {
+   |        ^^^^^^^^^^^^^
 
 error: aborting due to 3 previous errors
 

src/test/ui/typeck/typeck-unsafe-always-share.stderr

@@ -30,7 +30,11 @@ LL |     test(ms);
    |     ^^^^ `UnsafeCell<NoSync>` cannot be shared between threads safely
    |
    = help: within `MySync<NoSync>`, the trait `Sync` is not implemented for `UnsafeCell<NoSync>`
-   = note: required because it appears within the type `MySync<NoSync>`
+note: required because it appears within the type `MySync<NoSync>`
+  --> $DIR/typeck-unsafe-always-share.rs:8:8
+   |
+LL | struct MySync<T> {
+   |        ^^^^^^
 
 error[E0277]: `NoSync` cannot be shared between threads safely
   --> $DIR/typeck-unsafe-always-share.rs:30:10

src/test/ui/unsized-locals/issue-50940-with-feature.stderr

@@ -14,7 +14,11 @@ LL |     A as fn(str) -> A<str>;
    |     ^ doesn't have a size known at compile-time
    |
    = help: within `A<str>`, the trait `Sized` is not implemented for `str`
-   = note: required because it appears within the type `A<str>`
+note: required because it appears within the type `A<str>`
+  --> $DIR/issue-50940-with-feature.rs:5:12
+   |
+LL |     struct A<X: ?Sized>(X);
+   |            ^
    = note: the return type of a function must have a statically known size
 
 error: aborting due to previous error; 1 warning emitted

src/test/ui/unsized-locals/unsized-exprs.stderr

@@ -15,7 +15,11 @@ LL |     udrop::<A<[u8]>>(A { 0: *foo() });
    |                      ^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: within `A<[u8]>`, the trait `Sized` is not implemented for `[u8]`
-   = note: required because it appears within the type `A<[u8]>`
+note: required because it appears within the type `A<[u8]>`
+  --> $DIR/unsized-exprs.rs:3:8
+   |
+LL | struct A<X: ?Sized>(X);
+   |        ^
    = note: structs must have a statically known size to be initialized
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
@@ -25,7 +29,11 @@ LL |     udrop::<A<[u8]>>(A(*foo()));
    |                      ^ doesn't have a size known at compile-time
    |
    = help: within `A<[u8]>`, the trait `Sized` is not implemented for `[u8]`
-   = note: required because it appears within the type `A<[u8]>`
+note: required because it appears within the type `A<[u8]>`
+  --> $DIR/unsized-exprs.rs:3:8
+   |
+LL | struct A<X: ?Sized>(X);
+   |        ^
    = note: the return type of a function must have a statically known size
 
 error: aborting due to 3 previous errors

src/test/ui/unsized/unsized-enum2.stderr

@@ -301,7 +301,11 @@ LL |     VI(Path1),
    |        ^^^^^ doesn't have a size known at compile-time
    |
    = help: within `Path1`, the trait `Sized` is not implemented for `(dyn PathHelper1 + 'static)`
-   = note: required because it appears within the type `Path1`
+note: required because it appears within the type `Path1`
+  --> $DIR/unsized-enum2.rs:16:8
+   |
+LL | struct Path1(dyn PathHelper1);
+   |        ^^^^^
    = note: no field of an enum variant may have a dynamically sized type
    = help: change the field's type to have a statically known size
 help: borrowed types always have a statically known size
@@ -320,7 +324,11 @@ LL |     VJ{x: Path2},
    |           ^^^^^ doesn't have a size known at compile-time
    |
    = help: within `Path2`, the trait `Sized` is not implemented for `(dyn PathHelper2 + 'static)`
-   = note: required because it appears within the type `Path2`
+note: required because it appears within the type `Path2`
+  --> $DIR/unsized-enum2.rs:17:8
+   |
+LL | struct Path2(dyn PathHelper2);
+   |        ^^^^^
    = note: no field of an enum variant may have a dynamically sized type
    = help: change the field's type to have a statically known size
 help: borrowed types always have a statically known size
@@ -339,7 +347,11 @@ LL |     VK(isize, Path3),
    |               ^^^^^ doesn't have a size known at compile-time
    |
    = help: within `Path3`, the trait `Sized` is not implemented for `(dyn PathHelper3 + 'static)`
-   = note: required because it appears within the type `Path3`
+note: required because it appears within the type `Path3`
+  --> $DIR/unsized-enum2.rs:18:8
+   |
+LL | struct Path3(dyn PathHelper3);
+   |        ^^^^^
    = note: no field of an enum variant may have a dynamically sized type
    = help: change the field's type to have a statically known size
 help: borrowed types always have a statically known size
@@ -358,7 +370,11 @@ LL |     VL{u: isize, x: Path4},
    |                     ^^^^^ doesn't have a size known at compile-time
    |
    = help: within `Path4`, the trait `Sized` is not implemented for `(dyn PathHelper4 + 'static)`
-   = note: required because it appears within the type `Path4`
+note: required because it appears within the type `Path4`
+  --> $DIR/unsized-enum2.rs:19:8
+   |
+LL | struct Path4(dyn PathHelper4);
+   |        ^^^^^
    = note: no field of an enum variant may have a dynamically sized type
    = help: change the field's type to have a statically known size
 help: borrowed types always have a statically known size

src/test/ui/unsized/unsized-struct.stderr

@@ -28,7 +28,11 @@ LL | fn bar2<T: ?Sized>() { is_sized::<Bar<T>>() }
    |         |
    |         this type parameter needs to be `std::marker::Sized`
    |
-   = note: required because it appears within the type `Bar<T>`
+note: required because it appears within the type `Bar<T>`
+  --> $DIR/unsized-struct.rs:11:8
+   |
+LL | struct Bar<T: ?Sized> { data: T }
+   |        ^^^
 
 error: aborting due to 2 previous errors
 

src/test/ui/unsized3.stderr

@@ -41,7 +41,11 @@ LL | fn f8<X: ?Sized>(x1: &S<X>, x2: &S<X>) {
 LL |     f5(x1);
    |        ^^ doesn't have a size known at compile-time
    |
-   = note: required because it appears within the type `S<X>`
+note: required because it appears within the type `S<X>`
+  --> $DIR/unsized3.rs:28:8
+   |
+LL | struct S<X: ?Sized> {
+   |        ^
 help: consider relaxing the implicit `Sized` restriction
    |
 LL | fn f5<Y: ?Sized>(x: &Y) {}
@@ -55,7 +59,11 @@ LL | fn f9<X: ?Sized>(x1: Box<S<X>>) {
 LL |     f5(&(*x1, 34));
    |        ^^^^^^^^^^ doesn't have a size known at compile-time
    |
-   = note: required because it appears within the type `S<X>`
+note: required because it appears within the type `S<X>`
+  --> $DIR/unsized3.rs:28:8
+   |
+LL | struct S<X: ?Sized> {
+   |        ^
    = note: only the last element of a tuple may have a dynamically sized type
 
 error[E0277]: the size for values of type `X` cannot be known at compilation time
@@ -66,7 +74,11 @@ LL | fn f10<X: ?Sized>(x1: Box<S<X>>) {
 LL |     f5(&(32, *x1));
    |         ^^^^^^^^^ doesn't have a size known at compile-time
    |
-   = note: required because it appears within the type `S<X>`
+note: required because it appears within the type `S<X>`
+  --> $DIR/unsized3.rs:28:8
+   |
+LL | struct S<X: ?Sized> {
+   |        ^
    = note: required because it appears within the type `({integer}, S<X>)`
    = note: tuples must have a statically known size to be initialized
 
@@ -81,7 +93,11 @@ LL | fn f10<X: ?Sized>(x1: Box<S<X>>) {
 LL |     f5(&(32, *x1));
    |        ^^^^^^^^^^ doesn't have a size known at compile-time
    |
-   = note: required because it appears within the type `S<X>`
+note: required because it appears within the type `S<X>`
+  --> $DIR/unsized3.rs:28:8
+   |
+LL | struct S<X: ?Sized> {
+   |        ^
    = note: required because it appears within the type `({integer}, S<X>)`
 help: consider relaxing the implicit `Sized` restriction
    |