Update ui test suite to nightly-2021-10-07

.github/workflows/ci.yml

@@ -21,6 +21,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{matrix.rust}}
+          components: rust-src
       - run: cargo test --all
         env:
           RUSTFLAGS: ${{matrix.rustflags}}

rust-toolchain.toml

@@ -0,0 +1,2 @@
+[toolchain]
+components = ["rust-src"]

tests/ui/no-display.stderr

@@ -1,5 +1,5 @@
 error[E0599]: the method `as_display` exists for reference `&NoDisplay`, but its trait bounds were not satisfied
- --> $DIR/no-display.rs:7:9
+   --> $DIR/tests/ui/no-display.rs:7:9
     |
 4   | struct NoDisplay;
     | ----------------- doesn't satisfy `NoDisplay: std::fmt::Display`
@@ -10,3 +10,14 @@ error[E0599]: the method `as_display` exists for reference `&NoDisplay`, but its
     = note: the following trait bounds were not satisfied:
             `NoDisplay: std::fmt::Display`
             which is required by `&NoDisplay: DisplayAsDisplay`
+note: the following trait must be implemented
+   --> $RUST/core/src/fmt/mod.rs
+    |
+    | / pub trait Display {
+    | |     /// Formats the value using the given formatter.
+    | |     ///
+    | |     /// # Examples
+...   |
+    | |     fn fmt(&self, f: &mut Formatter<'_>) -> Result;
+    | | }
+    | |_^

tests/ui/source-enum-not-error.stderr

@@ -1,5 +1,5 @@
 error[E0599]: the method `as_dyn_error` exists for reference `&NotError`, but its trait bounds were not satisfied
-  --> $DIR/source-enum-not-error.rs:10:9
+   --> $DIR/tests/ui/source-enum-not-error.rs:10:9
     |
 4   | pub struct NotError;
     | --------------------
@@ -15,3 +15,14 @@ error[E0599]: the method `as_dyn_error` exists for reference `&NotError`, but it
             which is required by `NotError: AsDynError`
             `&NotError: std::error::Error`
             which is required by `&NotError: AsDynError`
+note: the following trait must be implemented
+   --> $RUST/std/src/error.rs
+    |
+    | / pub trait Error: Debug + Display {
+    | |     /// The lower-level source of this error, if any.
+    | |     ///
+    | |     /// # Examples
+...   |
+    | |     }
+    | | }
+    | |_^

tests/ui/source-struct-not-error.stderr

@@ -1,5 +1,5 @@
 error[E0599]: the method `as_dyn_error` exists for struct `NotError`, but its trait bounds were not satisfied
- --> $DIR/source-struct-not-error.rs:9:5
+   --> $DIR/tests/ui/source-struct-not-error.rs:9:5
     |
 4   | struct NotError;
     | ----------------
@@ -14,3 +14,14 @@ error[E0599]: the method `as_dyn_error` exists for struct `NotError`, but its tr
     = note: the following trait bounds were not satisfied:
             `NotError: std::error::Error`
             which is required by `NotError: AsDynError`
+note: the following trait must be implemented
+   --> $RUST/std/src/error.rs
+    |
+    | / pub trait Error: Debug + Display {
+    | |     /// The lower-level source of this error, if any.
+    | |     ///
+    | |     /// # Examples
+...   |
+    | |     }
+    | | }
+    | |_^