From 787e24cdfd5bef5136540287dd918e48b8a645db Mon Sep 17 00:00:00 2001
From: est31 <MTest31@outlook.com>
Date: Thu, 9 Jun 2022 23:46:40 +0200
Subject: [PATCH] Test that the unused_macros lint works correctly if rules are
 malformed

The unused_macro_rules lint had a bug where it would regard all rules of
a macro as unused if one rule were malformed. This bug doesn't exist
with the unused_macros lint. To ensure it doesn't appear in the future,
we add a test for it.
---
 .../unused/unused-macros-malformed-rule.rs    | 15 +++++++++++
 .../unused-macros-malformed-rule.stderr       | 26 +++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 src/test/ui/lint/unused/unused-macros-malformed-rule.rs
 create mode 100644 src/test/ui/lint/unused/unused-macros-malformed-rule.stderr

diff --git a/src/test/ui/lint/unused/unused-macros-malformed-rule.rs b/src/test/ui/lint/unused/unused-macros-malformed-rule.rs
new file mode 100644
index 000000000000..d4c35fad9b0f
--- /dev/null
+++ b/src/test/ui/lint/unused/unused-macros-malformed-rule.rs
@@ -0,0 +1,15 @@
+#![deny(unused_macros)]
+
+macro_rules! foo { //~ ERROR: unused macro definition
+    (v) => {};
+    () => 0; //~ ERROR: macro rhs must be delimited
+}
+
+macro_rules! bar {
+    (v) => {};
+    () => 0; //~ ERROR: macro rhs must be delimited
+}
+
+fn main() {
+    bar!(v);
+}
diff --git a/src/test/ui/lint/unused/unused-macros-malformed-rule.stderr b/src/test/ui/lint/unused/unused-macros-malformed-rule.stderr
new file mode 100644
index 000000000000..9a880dccfbf6
--- /dev/null
+++ b/src/test/ui/lint/unused/unused-macros-malformed-rule.stderr
@@ -0,0 +1,26 @@
+error: macro rhs must be delimited
+  --> $DIR/unused-macros-malformed-rule.rs:5:11
+   |
+LL |     () => 0;
+   |           ^
+
+error: macro rhs must be delimited
+  --> $DIR/unused-macros-malformed-rule.rs:10:11
+   |
+LL |     () => 0;
+   |           ^
+
+error: unused macro definition: `foo`
+  --> $DIR/unused-macros-malformed-rule.rs:3:14
+   |
+LL | macro_rules! foo {
+   |              ^^^
+   |
+note: the lint level is defined here
+  --> $DIR/unused-macros-malformed-rule.rs:1:9
+   |
+LL | #![deny(unused_macros)]
+   |         ^^^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
+