Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/test/ui/coherence/coherence-overlap-issue-23516.rs b/src/test/ui/coherence/coherence-overlap-issue-23516.rs
new file mode 100644
index 000000000..63e42e8f4
--- /dev/null
+++ b/src/test/ui/coherence/coherence-overlap-issue-23516.rs
@@ -0,0 +1,11 @@
+// Tests that we consider `Box<U>: !Sugar` to be ambiguous, even
+// though we see no impl of `Sugar` for `Box`. Therefore, an overlap
+// error is reported for the following pair of impls (#23516).
+
+pub trait Sugar { fn dummy(&self) { } }
+pub trait Sweet { fn dummy(&self) { } }
+impl<T:Sugar> Sweet for T { }
+impl<U:Sugar> Sweet for Box<U> { }
+//~^ ERROR E0119
+
+fn main() { }