Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/tests/ui/functions-closures/closure-to-fn-coercion.rs b/tests/ui/functions-closures/closure-to-fn-coercion.rs
new file mode 100644
index 000000000..87ba488b5
--- /dev/null
+++ b/tests/ui/functions-closures/closure-to-fn-coercion.rs
@@ -0,0 +1,35 @@
+// run-pass
+use std::mem;
+
+const FOO: fn(u8) -> u8 = |v: u8| { v };
+
+const BAR: [fn(&mut u32); 5] = [
+    |_: &mut u32| {},
+    |v: &mut u32| *v += 1,
+    |v: &mut u32| *v += 2,
+    |v: &mut u32| *v += 3,
+    |v: &mut u32| *v += 4,
+];
+fn func_specific() -> fn() -> u32 {
+    || return 42
+}
+
+fn generic<T>(_: T) -> fn() -> usize {
+    || mem::size_of::<T>()
+}
+
+fn main() {
+    // Items
+    assert_eq!(func_specific()(), 42);
+    let foo: fn(u8) -> u8 = |v: u8| { v };
+    assert_eq!(foo(31), 31);
+    // Constants
+    assert_eq!(FOO(31), 31);
+    let mut a: u32 = 0;
+    assert_eq!({ BAR[0](&mut a); a }, 0);
+    assert_eq!({ BAR[1](&mut a); a }, 1);
+    assert_eq!({ BAR[2](&mut a); a }, 3);
+    assert_eq!({ BAR[3](&mut a); a }, 6);
+    assert_eq!({ BAR[4](&mut a); a }, 10);
+    assert_eq!(generic(0i8)(), 1);
+}