1 files changed, 67 insertions, 0 deletions
diff --git a/src/tools/rustfmt/tests/target/issue-3198.rs b/src/tools/rustfmt/tests/target/issue-3198.rs
new file mode 100644
index 000000000..9291f181d
--- /dev/null
+++ b/src/tools/rustfmt/tests/target/issue-3198.rs
@@ -0,0 +1,67 @@
+impl TestTrait {
+    fn foo_one_pre(/* Important comment1 */ self) {}
+
+    fn foo_one_post(self /* Important comment1 */) {}
+
+    fn foo_pre(/* Important comment1 */ self, /* Important comment2 */ a: i32) {}
+
+    fn foo_post(self /* Important comment1 */, a: i32 /* Important comment2 */) {}
+
+    fn bar_pre(/* Important comment1 */ &mut self, /* Important comment2 */ a: i32) {}
+
+    fn bar_post(&mut self /* Important comment1 */, a: i32 /* Important comment2 */) {}
+
+    fn baz_pre(
+        /* Important comment1 */
+        self: X<'a, 'b>,
+        /* Important comment2 */
+        a: i32,
+    ) {
+    }
+
+    fn baz_post(
+        self: X<'a, 'b>, /* Important comment1 */
+        a: i32,          /* Important comment2 */
+    ) {
+    }
+
+    fn baz_tree_pre(
+        /* Important comment1 */
+        self: X<'a, 'b>,
+        /* Important comment2 */
+        a: i32,
+        /* Important comment3 */
+        b: i32,
+    ) {
+    }
+
+    fn baz_tree_post(
+        self: X<'a, 'b>, /* Important comment1 */
+        a: i32,          /* Important comment2 */
+        b: i32,          /* Important comment3 */
+    ) {
+    }
+
+    fn multi_line(
+        self: X<'a, 'b>, /* Important comment1-1 */
+        /* Important comment1-2 */
+        a: i32, /* Important comment2 */
+        b: i32, /* Important comment3 */
+    ) {
+    }
+
+    fn two_line_comment(
+        self: X<'a, 'b>, /* Important comment1-1
+                         Important comment1-2 */
+        a: i32, /* Important comment2 */
+        b: i32, /* Important comment3 */
+    ) {
+    }
+
+    fn no_first_line_comment(
+        self: X<'a, 'b>,
+        /* Important comment2 */ a: i32,
+        /* Important comment3 */ b: i32,
+    ) {
+    }
+}