Merging upstream version 1.70.0+dfsg1.

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

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/ui/dst/issue-90528-unsizing-suggestion-2.rs b/tests/ui/dst/issue-90528-unsizing-suggestion-2.rs
new file mode 100644
index 000000000..f2762ad42
--- /dev/null
+++ b/tests/ui/dst/issue-90528-unsizing-suggestion-2.rs
@@ -0,0 +1,28 @@
+// Issue #90528: provide helpful suggestions when a trait bound is unsatisfied
+// due to a missed unsizing coercion.
+//
+// This test exercises array variables and a trait implemented on immmutable slices.
+
+trait Read {}
+
+impl Read for &[u8] {}
+
+fn wants_read(_: impl Read) {}
+
+fn main() {
+    let x = [0u8];
+    wants_read(x);
+    //~^ ERROR the trait bound `[u8; 1]: Read` is not satisfied
+    wants_read(&x);
+    //~^ ERROR the trait bound `&[u8; 1]: Read` is not satisfied
+    wants_read(&x[..]);
+
+    let x = &[0u8];
+    wants_read(x);
+    //~^ ERROR the trait bound `&[u8; 1]: Read` is not satisfied
+    wants_read(&x);
+    //~^ ERROR the trait bound `&&[u8; 1]: Read` is not satisfied
+    wants_read(*x);
+    //~^ ERROR the trait bound `[u8; 1]: Read` is not satisfied
+    wants_read(&x[..]);
+}