From 6bd6a204754658173be37f77985abf052bc33b6d Mon Sep 17 00:00:00 2001
From: Vadim Petrochenkov <vadim.petrochenkov@gmail.com>
Date: Sun, 29 Dec 2019 23:53:35 +0300
Subject: [PATCH] Add a test

---
 .../ui/deduplicate-diagnostics.deduplicate.stderr  |  8 ++++++++
 .../ui/deduplicate-diagnostics.duplicate.stderr    | 14 ++++++++++++++
 src/test/ui/deduplicate-diagnostics.rs             |  8 ++++++++
 3 files changed, 30 insertions(+)
 create mode 100644 src/test/ui/deduplicate-diagnostics.deduplicate.stderr
 create mode 100644 src/test/ui/deduplicate-diagnostics.duplicate.stderr
 create mode 100644 src/test/ui/deduplicate-diagnostics.rs

diff --git a/src/test/ui/deduplicate-diagnostics.deduplicate.stderr b/src/test/ui/deduplicate-diagnostics.deduplicate.stderr
new file mode 100644
index 00000000000..1acfce50622
--- /dev/null
+++ b/src/test/ui/deduplicate-diagnostics.deduplicate.stderr
@@ -0,0 +1,8 @@
+error: cannot find derive macro `Unresolved` in this scope
+  --> $DIR/deduplicate-diagnostics.rs:4:10
+   |
+LL | #[derive(Unresolved)]
+   |          ^^^^^^^^^^
+
+error: aborting due to previous error
+
diff --git a/src/test/ui/deduplicate-diagnostics.duplicate.stderr b/src/test/ui/deduplicate-diagnostics.duplicate.stderr
new file mode 100644
index 00000000000..325da3b5d91
--- /dev/null
+++ b/src/test/ui/deduplicate-diagnostics.duplicate.stderr
@@ -0,0 +1,14 @@
+error: cannot find derive macro `Unresolved` in this scope
+  --> $DIR/deduplicate-diagnostics.rs:4:10
+   |
+LL | #[derive(Unresolved)]
+   |          ^^^^^^^^^^
+
+error: cannot find derive macro `Unresolved` in this scope
+  --> $DIR/deduplicate-diagnostics.rs:4:10
+   |
+LL | #[derive(Unresolved)]
+   |          ^^^^^^^^^^
+
+error: aborting due to 2 previous errors
+
diff --git a/src/test/ui/deduplicate-diagnostics.rs b/src/test/ui/deduplicate-diagnostics.rs
new file mode 100644
index 00000000000..4a1f503d757
--- /dev/null
+++ b/src/test/ui/deduplicate-diagnostics.rs
@@ -0,0 +1,8 @@
+// revisions: duplicate deduplicate
+//[duplicate] compile-flags: -Z deduplicate-diagnostics=no
+
+#[derive(Unresolved)] //~ ERROR cannot find derive macro `Unresolved` in this scope
+                      //[duplicate]~| ERROR cannot find derive macro `Unresolved` in this scope
+struct S;
+
+fn main() {}