4 files changed, 21 insertions, 0 deletions
diff --git a/ui-tests/src/bin/attr_collection_duplicate.rs b/ui-tests/src/bin/attr_collection_duplicate.rs
new file mode 100644
index 0000000..27e412d
--- /dev/null
+++ b/ui-tests/src/bin/attr_collection_duplicate.rs
@@ -0,0 +1,6 @@
+#[dynamize::dynamize]
+#[collection(Foo, 1)]
+#[collection(Foo, 2)]
+trait Trait {}
+
+fn main() {}
diff --git a/ui-tests/src/bin/attr_collection_duplicate.stderr b/ui-tests/src/bin/attr_collection_duplicate.stderr
new file mode 100644
index 0000000..7d91236
--- /dev/null
+++ b/ui-tests/src/bin/attr_collection_duplicate.stderr
@@ -0,0 +1,5 @@
+error: collection `Foo` is defined multiple times for this trait
+ --> src/bin/attr_collection_duplicate.rs:3:14
+  |
+3 | #[collection(Foo, 2)]
+  |              ^^^
diff --git a/ui-tests/src/bin/attr_collection_zero.rs b/ui-tests/src/bin/attr_collection_zero.rs
new file mode 100644
index 0000000..6f45ea8
--- /dev/null
+++ b/ui-tests/src/bin/attr_collection_zero.rs
@@ -0,0 +1,5 @@
+#[dynamize::dynamize]
+#[collection(Foo, 0)]
+trait Trait {}
+
+fn main() {}
diff --git a/ui-tests/src/bin/attr_collection_zero.stderr b/ui-tests/src/bin/attr_collection_zero.stderr
new file mode 100644
index 0000000..47a87c9
--- /dev/null
+++ b/ui-tests/src/bin/attr_collection_zero.stderr
@@ -0,0 +1,5 @@
+error: number of type parameters must be >= 1
+ --> src/bin/attr_collection_zero.rs:2:19
+  |
+2 | #[collection(Foo, 0)]
+  |                   ^