1 files changed, 23 insertions, 0 deletions
diff --git a/src/tools/rustfmt/tests/source/issue-4643.rs b/src/tools/rustfmt/tests/source/issue-4643.rs
new file mode 100644
index 000000000..382072d90
--- /dev/null
+++ b/src/tools/rustfmt/tests/source/issue-4643.rs
@@ -0,0 +1,23 @@
+// output doesn't get corrupted when using comments within generic type parameters of a trait
+
+pub trait Something<
+    A,
+    // some comment
+    B,
+    C
+> {
+    fn a(&self, x: A) -> i32;
+    fn b(&self, x: B) -> i32;
+    fn c(&self, x: C) -> i32;
+}
+
+pub trait SomethingElse<
+    A,
+    /* some comment */
+    B,
+    C
+> {
+    fn a(&self, x: A) -> i32;
+    fn b(&self, x: B) -> i32;
+    fn c(&self, x: C) -> i32;
+}