From dc2db7389945ce13e28c017c69991dc4e0794c79 Mon Sep 17 00:00:00 2001
From: Ryan Levick <me@ryanlevick.com>
Date: Wed, 2 Jun 2021 17:25:24 +0200
Subject: [PATCH] Add deny-by-default test

---
 .../lint/force-warn/force-deny-by-default-lint.rs  |  8 ++++++++
 .../force-warn/force-deny-by-default-lint.stderr   | 14 ++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 src/test/ui/lint/force-warn/force-deny-by-default-lint.rs
 create mode 100644 src/test/ui/lint/force-warn/force-deny-by-default-lint.stderr

diff --git a/src/test/ui/lint/force-warn/force-deny-by-default-lint.rs b/src/test/ui/lint/force-warn/force-deny-by-default-lint.rs
new file mode 100644
index 000000000000..4f267f085d54
--- /dev/null
+++ b/src/test/ui/lint/force-warn/force-deny-by-default-lint.rs
@@ -0,0 +1,8 @@
+// compile-flags: --force-warns const_err
+// check-pass
+
+const C: i32 = 1 / 0;
+//~^ WARN any use of this value will cause an error
+//~| WARN this was previously accepted by the compiler
+
+fn main() {}
diff --git a/src/test/ui/lint/force-warn/force-deny-by-default-lint.stderr b/src/test/ui/lint/force-warn/force-deny-by-default-lint.stderr
new file mode 100644
index 000000000000..a1905034f5b5
--- /dev/null
+++ b/src/test/ui/lint/force-warn/force-deny-by-default-lint.stderr
@@ -0,0 +1,14 @@
+warning: any use of this value will cause an error
+  --> $DIR/force-deny-by-default-lint.rs:4:16
+   |
+LL | const C: i32 = 1 / 0;
+   | ---------------^^^^^-
+   |                |
+   |                attempt to divide `1_i32` by zero
+   |
+   = note: Warning forced by `force-warns` commandline option
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
+
+warning: 1 warning emitted
+