1 files changed, 26 insertions, 0 deletions
diff --git a/tests/ui/dst/issue-90528-unsizing-suggestion-4.rs b/tests/ui/dst/issue-90528-unsizing-suggestion-4.rs
new file mode 100644
index 000000000..eae953c61
--- /dev/null
+++ b/tests/ui/dst/issue-90528-unsizing-suggestion-4.rs
@@ -0,0 +1,26 @@
+// 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 mutable slices.
+
+trait Write {}
+
+impl Write for &mut [u8] {}
+
+fn wants_write(_: impl Write) {}
+
+fn main() {
+    let mut x = [0u8];
+    wants_write(x);
+    //~^ ERROR the trait bound `[u8; 1]: Write` is not satisfied
+    wants_write(&mut x);
+    //~^ ERROR the trait bound `&mut [u8; 1]: Write` is not satisfied
+    wants_write(&mut x[..]);
+
+    let x = &mut [0u8];
+    wants_write(x);
+    //~^ ERROR the trait bound `&mut [u8; 1]: Write` is not satisfied
+    wants_write(*x);
+    //~^ ERROR the trait bound `[u8; 1]: Write` is not satisfied
+    wants_write(&mut x[..]);
+}