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-rw-r--r--tests/ui/unboxed-closures/unboxed-closures-manual-impl.rs31
1 files changed, 31 insertions, 0 deletions
diff --git a/tests/ui/unboxed-closures/unboxed-closures-manual-impl.rs b/tests/ui/unboxed-closures/unboxed-closures-manual-impl.rs
new file mode 100644
index 000000000..df60b42ab
--- /dev/null
+++ b/tests/ui/unboxed-closures/unboxed-closures-manual-impl.rs
@@ -0,0 +1,31 @@
+// run-pass
+#![feature(unboxed_closures, fn_traits)]
+
+struct S;
+
+impl FnMut<(i32,)> for S {
+ extern "rust-call" fn call_mut(&mut self, (x,): (i32,)) -> i32 {
+ x * x
+ }
+}
+
+impl FnOnce<(i32,)> for S {
+ type Output = i32;
+
+ extern "rust-call" fn call_once(mut self, args: (i32,)) -> i32 { self.call_mut(args) }
+}
+
+fn call_it<F:FnMut(i32)->i32>(mut f: F, x: i32) -> i32 {
+ f(x) + 3
+}
+
+fn call_box(f: &mut dyn FnMut(i32) -> i32, x: i32) -> i32 {
+ f(x) + 3
+}
+
+fn main() {
+ let x = call_it(S, 1);
+ let y = call_box(&mut S, 1);
+ assert_eq!(x, 4);
+ assert_eq!(y, 4);
+}