diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 86f4476..260f375 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,6 +26,8 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rust-src
       - run: cargo test
       - run: cargo update -Z minimal-versions
       - run: cargo build
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..20fe888
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+components = ["rust-src"]
diff --git a/tests/ui/not-repeatable.stderr b/tests/ui/not-repeatable.stderr
index 94b8b87..76f5261 100644
--- a/tests/ui/not-repeatable.stderr
+++ b/tests/ui/not-repeatable.stderr
@@ -1,25 +1,47 @@
 error[E0599]: the method `quote_into_iter` exists for struct `Ipv4Addr`, but its trait bounds were not satisfied
- --> $DIR/not-repeatable.rs:7:13
-  |
-3 | struct Ipv4Addr;
-  | ----------------
-  | |
-  | method `quote_into_iter` not found for this
-  | doesn't satisfy `Ipv4Addr: Iterator`
-  | doesn't satisfy `Ipv4Addr: ToTokens`
-  | doesn't satisfy `Ipv4Addr: quote::__private::ext::RepIteratorExt`
-  | doesn't satisfy `Ipv4Addr: quote::__private::ext::RepToTokensExt`
+    --> $DIR/tests/ui/not-repeatable.rs:7:13
+     |
+3    | struct Ipv4Addr;
+     | ----------------
+     | |
+     | method `quote_into_iter` not found for this
+     | doesn't satisfy `Ipv4Addr: Iterator`
+     | doesn't satisfy `Ipv4Addr: ToTokens`
+     | doesn't satisfy `Ipv4Addr: quote::__private::ext::RepIteratorExt`
+     | doesn't satisfy `Ipv4Addr: quote::__private::ext::RepToTokensExt`
 ...
-7 |     let _ = quote! { #(#ip)* };
-  |             ^^^^^^^^^^^^^^^^^^ method cannot be called on `Ipv4Addr` due to unsatisfied trait bounds
-  |
-  = note: the following trait bounds were not satisfied:
-          `Ipv4Addr: Iterator`
-          which is required by `Ipv4Addr: quote::__private::ext::RepIteratorExt`
-          `&Ipv4Addr: Iterator`
-          which is required by `&Ipv4Addr: quote::__private::ext::RepIteratorExt`
-          `Ipv4Addr: ToTokens`
-          which is required by `Ipv4Addr: quote::__private::ext::RepToTokensExt`
-          `&mut Ipv4Addr: Iterator`
-          which is required by `&mut Ipv4Addr: quote::__private::ext::RepIteratorExt`
-  = note: this error originates in the macro `$crate::quote_bind_into_iter` (in Nightly builds, run with -Z macro-backtrace for more info)
+7    |     let _ = quote! { #(#ip)* };
+     |             ^^^^^^^^^^^^^^^^^^ method cannot be called on `Ipv4Addr` due to unsatisfied trait bounds
+     |
+     = note: the following trait bounds were not satisfied:
+             `Ipv4Addr: Iterator`
+             which is required by `Ipv4Addr: quote::__private::ext::RepIteratorExt`
+             `&Ipv4Addr: Iterator`
+             which is required by `&Ipv4Addr: quote::__private::ext::RepIteratorExt`
+             `Ipv4Addr: ToTokens`
+             which is required by `Ipv4Addr: quote::__private::ext::RepToTokensExt`
+             `&mut Ipv4Addr: Iterator`
+             which is required by `&mut Ipv4Addr: quote::__private::ext::RepIteratorExt`
+note: the following traits must be implemented
+    --> $RUST/core/src/iter/traits/iterator.rs
+     |
+     | /  pub trait Iterator {
+     | |      /// The type of the elements being iterated over.
+     | |      #[stable(feature = "rust1", since = "1.0.0")]
+     | |      type Item;
+...    |
+     | |      }
+     | |  }
+     | |__^
+     |
+    ::: $DIR/src/to_tokens.rs:12:1
+     |
+12   |  / pub trait ToTokens {
+13   |  |     /// Write `self` to the given `TokenStream`.
+14   |  |     ///
+15   |  |     /// The token append methods provided by the [`TokenStreamExt`] extension
+...     |
+76   |  |     }
+77   |  | }
+     |  |_^
+     = note: this error originates in the macro `$crate::quote_bind_into_iter` (in Nightly builds, run with -Z macro-backtrace for more info)