On E0277, point at type that doesn't implement bound

When encountering an unmet trait bound, point at local type that doesn't implement the trait:

```
error[E0277]: the trait bound `Bar<T>: Foo` is not satisfied
  --> $DIR/issue-64855.rs:9:19
   |
LL | pub struct Bar<T>(<Self as Foo>::Type) where Self: ;
   |                   ^^^^^^^^^^^^^^^^^^^ unsatisfied trait bound
   |
help: the trait `Foo` is not implemented for `Bar<T>`
  --> $DIR/issue-64855.rs:9:1
   |
LL | pub struct Bar<T>(<Self as Foo>::Type) where Self: ;
   | ^^^^^^^^^^^^^^^^^
```

4 files changed, 30 insertions, 5 deletions

diff --git a/tests/ui-fulldeps/rustc-dev-remap.only-remap.stderr b/tests/ui-fulldeps/rustc-dev-remap.only-remap.stderr
index 0c969b9c6d8..b8de9291d65 100644
--- a/tests/ui-fulldeps/rustc-dev-remap.only-remap.stderr
+++ b/tests/ui-fulldeps/rustc-dev-remap.only-remap.stderr
@@ -2,8 +2,13 @@ error[E0277]: the trait bound `NotAValidResultType: VisitorResult` is not satisf
   --> $DIR/rustc-dev-remap.rs:LL:COL
    |
 LL |     type Result = NotAValidResultType;
-   |                   ^^^^^^^^^^^^^^^^^^^ the trait `VisitorResult` is not implemented for `NotAValidResultType`
+   |                   ^^^^^^^^^^^^^^^^^^^ unsatisfied trait bound
    |
+help: the trait `VisitorResult` is not implemented for `NotAValidResultType`
+  --> $DIR/rustc-dev-remap.rs:LL:COL
+   |
+LL | struct NotAValidResultType;
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: the following other types implement trait `VisitorResult`:
              ()
              ControlFlow<T>
diff --git a/tests/ui-fulldeps/rustc-dev-remap.remap-unremap.stderr b/tests/ui-fulldeps/rustc-dev-remap.remap-unremap.stderr
index 6ac8c3046f6..29b43c819d0 100644
--- a/tests/ui-fulldeps/rustc-dev-remap.remap-unremap.stderr
+++ b/tests/ui-fulldeps/rustc-dev-remap.remap-unremap.stderr
@@ -2,8 +2,13 @@ error[E0277]: the trait bound `NotAValidResultType: VisitorResult` is not satisf
   --> $DIR/rustc-dev-remap.rs:LL:COL
    |
 LL |     type Result = NotAValidResultType;
-   |                   ^^^^^^^^^^^^^^^^^^^ the trait `VisitorResult` is not implemented for `NotAValidResultType`
+   |                   ^^^^^^^^^^^^^^^^^^^ unsatisfied trait bound
    |
+help: the trait `VisitorResult` is not implemented for `NotAValidResultType`
+  --> $DIR/rustc-dev-remap.rs:LL:COL
+   |
+LL | struct NotAValidResultType;
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
    = help: the following other types implement trait `VisitorResult`:
              ()
              ControlFlow<T>
diff --git a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive-doc-comment-field.stderr b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive-doc-comment-field.stderr
index 7377b0dfd0a..8b6c4b181c0 100644
--- a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive-doc-comment-field.stderr
+++ b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive-doc-comment-field.stderr
@@ -5,8 +5,13 @@ LL | #[derive(Diagnostic)]
    |          ---------- required by a bound introduced by this call
 ...
 LL |     arg: NotIntoDiagArg,
-   |          ^^^^^^^^^^^^^^ the trait `IntoDiagArg` is not implemented for `NotIntoDiagArg`
+   |          ^^^^^^^^^^^^^^ unsatisfied trait bound
    |
+help: the trait `IntoDiagArg` is not implemented for `NotIntoDiagArg`
+  --> $DIR/diagnostic-derive-doc-comment-field.rs:28:1
+   |
+LL | struct NotIntoDiagArg;
+   | ^^^^^^^^^^^^^^^^^^^^^
    = help: normalized in stderr
 note: required by a bound in `Diag::<'a, G>::arg`
   --> $COMPILER_DIR/rustc_errors/src/diagnostic.rs:LL:CC
@@ -19,8 +24,13 @@ LL | #[derive(Subdiagnostic)]
    |          ------------- required by a bound introduced by this call
 ...
 LL |     arg: NotIntoDiagArg,
-   |          ^^^^^^^^^^^^^^ the trait `IntoDiagArg` is not implemented for `NotIntoDiagArg`
+   |          ^^^^^^^^^^^^^^ unsatisfied trait bound
+   |
+help: the trait `IntoDiagArg` is not implemented for `NotIntoDiagArg`
+  --> $DIR/diagnostic-derive-doc-comment-field.rs:28:1
    |
+LL | struct NotIntoDiagArg;
+   | ^^^^^^^^^^^^^^^^^^^^^
    = help: normalized in stderr
 note: required by a bound in `Diag::<'a, G>::arg`
   --> $COMPILER_DIR/rustc_errors/src/diagnostic.rs:LL:CC
diff --git a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr
index 396abb001ce..59b48e9f0ec 100644
--- a/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr
+++ b/tests/ui-fulldeps/session-diagnostic/diagnostic-derive.stderr
@@ -637,8 +637,13 @@ LL | #[derive(Diagnostic)]
    |          ---------- required by a bound introduced by this call
 ...
 LL |     other: Hello,
-   |            ^^^^^ the trait `IntoDiagArg` is not implemented for `Hello`
+   |            ^^^^^ unsatisfied trait bound
    |
+help: the trait `IntoDiagArg` is not implemented for `Hello`
+  --> $DIR/diagnostic-derive.rs:40:1
+   |
+LL | struct Hello {}
+   | ^^^^^^^^^^^^
    = help: normalized in stderr
 note: required by a bound in `Diag::<'a, G>::arg`
   --> $COMPILER_DIR/rustc_errors/src/diagnostic.rs:LL:CC