From 00b10a5552c575e884a40de808a3cb64a647a442 Mon Sep 17 00:00:00 2001
From: yukang <moorekang@gmail.com>
Date: Tue, 6 Sep 2022 14:16:54 +0800
Subject: get_attr should check that no duplicates are allowed

---
 src/test/ui/attributes/issue-100631.rs     |  8 ++++++++
 src/test/ui/attributes/issue-100631.stderr | 12 ++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 src/test/ui/attributes/issue-100631.rs
 create mode 100644 src/test/ui/attributes/issue-100631.stderr

(limited to 'src/test')

diff --git a/src/test/ui/attributes/issue-100631.rs b/src/test/ui/attributes/issue-100631.rs
new file mode 100644
index 00000000000..0fefcf83fd5
--- /dev/null
+++ b/src/test/ui/attributes/issue-100631.rs
@@ -0,0 +1,8 @@
+// issue #100631, make sure `TyCtxt::get_attr` only called by case that compiler
+// can reasonably deal with multiple attributes.
+// `repr` will use `TyCtxt::get_attrs` since it's `DuplicatesOk`.
+#[repr(C)] //~ ERROR: unsupported representation for zero-variant enum [E0084]
+#[repr(C)]
+enum Foo {}
+
+fn main() {}
diff --git a/src/test/ui/attributes/issue-100631.stderr b/src/test/ui/attributes/issue-100631.stderr
new file mode 100644
index 00000000000..caa5351ddc7
--- /dev/null
+++ b/src/test/ui/attributes/issue-100631.stderr
@@ -0,0 +1,12 @@
+error[E0084]: unsupported representation for zero-variant enum
+  --> $DIR/issue-100631.rs:4:1
+   |
+LL | #[repr(C)]
+   | ^^^^^^^^^^
+LL | #[repr(C)]
+LL | enum Foo {}
+   | -------- zero-variant enum
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0084`.
-- 
cgit 1.4.1-3-g733a5