diff --git a/tests/source/const_generics.rs b/tests/source/const_generics.rs
index 07ef99107a8..01b764dbe45 100644
--- a/tests/source/const_generics.rs
+++ b/tests/source/const_generics.rs
@@ -34,3 +34,11 @@ fn foo<const X: usize>() {
 pub trait Foo: Bar<{Baz::COUNT}> {
 	const ASD: usize;
 }
+
+// #4263
+fn const_generics_on_params<
+    // AAAA
+        const BBBB: usize,
+    /* CCCC */
+    const DDDD: usize,
+    >() {}
diff --git a/tests/target/const_generics.rs b/tests/target/const_generics.rs
index f49c5a1bb10..b30b7b58c12 100644
--- a/tests/target/const_generics.rs
+++ b/tests/target/const_generics.rs
@@ -26,3 +26,12 @@ fn foo<const X: usize>() {
 pub trait Foo: Bar<{ Baz::COUNT }> {
     const ASD: usize;
 }
+
+// #4263
+fn const_generics_on_params<
+    // AAAA
+    const BBBB: usize,
+    /* CCCC */
+    const DDDD: usize,
+>() {
+}