1 files changed, 24 insertions, 0 deletions
diff --git a/tests/ui/traits/const-traits/const-closure-issue-125866-error.rs b/tests/ui/traits/const-traits/const-closure-issue-125866-error.rs
new file mode 100644
index 00000000000..7a44920bb72
--- /dev/null
+++ b/tests/ui/traits/const-traits/const-closure-issue-125866-error.rs
@@ -0,0 +1,24 @@
+#![allow(incomplete_features)]
+#![feature(const_closures, const_trait_impl)]
+
+const fn create_array<const N: usize>(mut f: impl FnMut(usize) -> u32 + Copy) -> [u32; N] {
+    let mut array = [0; N];
+    let mut i = 0;
+    loop {
+        array[i] = f(i);
+        //~^ ERROR the trait bound `impl FnMut(usize) -> u32 + Copy: [const] FnMut(usize)` is not satisfied [E0277]
+        i += 1;
+        if i == N {
+            break;
+        }
+    }
+    array
+}
+
+fn main() {
+    let x = create_array(const |i| 2 * i as u32);
+    assert_eq!(x, [0, 2, 4, 6, 8]);
+
+    let y = create_array(const |i| 2 * i as u32 + 1);
+    assert_eq!(y, [1, 3, 5, 7, 9]);
+}