From 8602ca3dd2bac8c116ccee065a3b22a24718da77 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sat, 18 Dec 2021 11:36:51 -0800
Subject: [PATCH] Add ui test reproducing issue 163

---
 tests/ui/from-backtrace-backtrace.rs     | 12 ++++++++++++
 tests/ui/from-backtrace-backtrace.stderr |  5 +++++
 2 files changed, 17 insertions(+)
 create mode 100644 tests/ui/from-backtrace-backtrace.rs
 create mode 100644 tests/ui/from-backtrace-backtrace.stderr

diff --git a/tests/ui/from-backtrace-backtrace.rs b/tests/ui/from-backtrace-backtrace.rs
new file mode 100644
index 00000000..aefe0cf5
--- /dev/null
+++ b/tests/ui/from-backtrace-backtrace.rs
@@ -0,0 +1,12 @@
+// https://github.com/dtolnay/thiserror/issues/163
+
+#![feature(backtrace)]
+
+use std::backtrace::Backtrace;
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+#[error("...")]
+pub struct Error(#[from] #[backtrace] std::io::Error, Backtrace);
+
+fn main() {}
diff --git a/tests/ui/from-backtrace-backtrace.stderr b/tests/ui/from-backtrace-backtrace.stderr
new file mode 100644
index 00000000..416896ca
--- /dev/null
+++ b/tests/ui/from-backtrace-backtrace.stderr
@@ -0,0 +1,5 @@
+error[E0063]: missing field `1` in initializer of `Error`
+  --> tests/ui/from-backtrace-backtrace.rs:10:12
+   |
+10 | pub struct Error(#[from] #[backtrace] std::io::Error, Backtrace);
+   |            ^^^^^ missing `1`