1 files changed, 66 insertions, 0 deletions
diff --git a/src/test/ui/phantom-auto-trait.stderr b/src/test/ui/phantom-auto-trait.stderr
new file mode 100644
index 000000000..1cc653c51
--- /dev/null
+++ b/src/test/ui/phantom-auto-trait.stderr
@@ -0,0 +1,66 @@
+error[E0277]: `T` cannot be shared between threads safely
+  --> $DIR/phantom-auto-trait.rs:21:12
+   |
+LL |     is_zen(x)
+   |     ------ ^ `T` cannot be shared between threads safely
+   |     |
+   |     required by a bound introduced by this call
+   |
+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>`
+  --> $DIR/phantom-auto-trait.rs:12:8
+   |
+LL | struct Guard<'a, T: 'a> {
+   |        ^^^^^
+note: required by a bound in `is_zen`
+  --> $DIR/phantom-auto-trait.rs:18:14
+   |
+LL | fn is_zen<T: Zen>(_: T) {}
+   |              ^^^ required by this bound in `is_zen`
+help: consider restricting type parameter `T`
+   |
+LL | fn not_sync<T: std::marker::Sync>(x: Guard<T>) {
+   |              +++++++++++++++++++
+
+error[E0277]: `T` cannot be shared between threads safely
+  --> $DIR/phantom-auto-trait.rs:26:12
+   |
+LL |     is_zen(x)
+   |     ------ ^ `T` cannot be shared between threads safely
+   |     |
+   |     required by a bound introduced by this call
+   |
+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>`
+  --> $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);
+   |        ^^^^^^
+note: required by a bound in `is_zen`
+  --> $DIR/phantom-auto-trait.rs:18:14
+   |
+LL | fn is_zen<T: Zen>(_: T) {}
+   |              ^^^ required by this bound in `is_zen`
+help: consider restricting type parameter `T`
+   |
+LL | fn nested_not_sync<T: std::marker::Sync>(x: Nested<Guard<T>>) {
+   |                     +++++++++++++++++++
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0277`.