From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:19:13 +0200
Subject: Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../unboxed-closures-fn-as-fnmut-and-fnonce.rs     | 44 ++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 tests/ui/unboxed-closures/unboxed-closures-fn-as-fnmut-and-fnonce.rs

(limited to 'tests/ui/unboxed-closures/unboxed-closures-fn-as-fnmut-and-fnonce.rs')

diff --git a/tests/ui/unboxed-closures/unboxed-closures-fn-as-fnmut-and-fnonce.rs b/tests/ui/unboxed-closures/unboxed-closures-fn-as-fnmut-and-fnonce.rs
new file mode 100644
index 000000000..851f3d2fe
--- /dev/null
+++ b/tests/ui/unboxed-closures/unboxed-closures-fn-as-fnmut-and-fnonce.rs
@@ -0,0 +1,44 @@
+// run-pass
+// Checks that the Fn trait hierarchy rules permit
+// any Fn trait to be used where Fn is implemented.
+
+#![feature(unboxed_closures, fn_traits)]
+
+use std::ops::{Fn,FnMut,FnOnce};
+
+struct S;
+
+impl Fn<(i32,)> for S {
+    extern "rust-call" fn call(&self, (x,): (i32,)) -> i32 {
+        x * x
+    }
+}
+
+impl FnMut<(i32,)> for S {
+    extern "rust-call" fn call_mut(&mut self, args: (i32,)) -> i32 { self.call(args) }
+}
+
+impl FnOnce<(i32,)> for S {
+    type Output = i32;
+    extern "rust-call" fn call_once(self, args: (i32,)) -> i32 { self.call(args) }
+}
+
+fn call_it<F:Fn(i32)->i32>(f: &F, x: i32) -> i32 {
+    f(x)
+}
+
+fn call_it_mut<F:FnMut(i32)->i32>(f: &mut F, x: i32) -> i32 {
+    f(x)
+}
+
+fn call_it_once<F:FnOnce(i32)->i32>(f: F, x: i32) -> i32 {
+    f(x)
+}
+
+fn main() {
+    let x = call_it(&S, 22);
+    let y = call_it_mut(&mut S, 22);
+    let z = call_it_once(S, 22);
+    assert_eq!(x, y);
+    assert_eq!(y, z);
+}
-- 
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