Auto merge of #24168 - kballard:clone-for-extern-c-unsafe-fns, r=alexcrichton

We only implemented Clone on `extern "Rust" fn`s (for up to 8
parameters). This didn't cover `extern "C"` or `unsafe` (or
`unsafe extern "C"`) `fn`s, but there's no reason why they shouldn't be
cloneable as well.

The new impls are marked unstable because the existing impl for `extern
"Rust" fn`s is.

Fixes #24161.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/test/run-pass/issue-24161.rs b/src/test/run-pass/issue-24161.rs
new file mode 100644
index 00000000000..2445ef17ecf
--- /dev/null
+++ b/src/test/run-pass/issue-24161.rs
@@ -0,0 +1,19 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[derive(Copy,Clone)]
+struct Functions {
+    a: fn(u32) -> u32,
+    b: extern "C" fn(u32) -> u32,
+    c: unsafe fn(u32) -> u32,
+    d: unsafe extern "C" fn(u32) -> u32
+}
+
+pub fn main() {}