1 files changed, 51 insertions, 0 deletions
diff --git a/tests/ui/unboxed-closures/unboxed-closures-unsafe-extern-fn.stderr b/tests/ui/unboxed-closures/unboxed-closures-unsafe-extern-fn.stderr
new file mode 100644
index 000000000..802696e1b
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+++ b/tests/ui/unboxed-closures/unboxed-closures-unsafe-extern-fn.stderr
@@ -0,0 +1,51 @@
+error[E0277]: expected a `Fn<(&isize,)>` closure, found `for<'a> unsafe fn(&'a isize) -> isize {square}`
+  --> $DIR/unboxed-closures-unsafe-extern-fn.rs:20:21
+   |
+LL |     let x = call_it(&square, 22);
+   |             ------- ^^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
+   |             |
+   |             required by a bound introduced by this call
+   |
+   = help: the trait `for<'a> Fn<(&'a isize,)>` is not implemented for fn item `for<'a> unsafe fn(&'a isize) -> isize {square}`
+   = note: unsafe function cannot be called generically without an unsafe block
+note: required by a bound in `call_it`
+  --> $DIR/unboxed-closures-unsafe-extern-fn.rs:9:15
+   |
+LL | fn call_it<F: Fn(&isize) -> isize>(_: &F, _: isize) -> isize {
+   |               ^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it`
+
+error[E0277]: expected a `FnMut<(&isize,)>` closure, found `for<'a> unsafe fn(&'a isize) -> isize {square}`
+  --> $DIR/unboxed-closures-unsafe-extern-fn.rs:25:25
+   |
+LL |     let y = call_it_mut(&mut square, 22);
+   |             ----------- ^^^^^^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
+   |             |
+   |             required by a bound introduced by this call
+   |
+   = help: the trait `for<'a> FnMut<(&'a isize,)>` is not implemented for fn item `for<'a> unsafe fn(&'a isize) -> isize {square}`
+   = note: unsafe function cannot be called generically without an unsafe block
+note: required by a bound in `call_it_mut`
+  --> $DIR/unboxed-closures-unsafe-extern-fn.rs:12:19
+   |
+LL | fn call_it_mut<F: FnMut(&isize) -> isize>(_: &mut F, _: isize) -> isize {
+   |                   ^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it_mut`
+
+error[E0277]: expected a `FnOnce<(&isize,)>` closure, found `for<'a> unsafe fn(&'a isize) -> isize {square}`
+  --> $DIR/unboxed-closures-unsafe-extern-fn.rs:30:26
+   |
+LL |     let z = call_it_once(square, 22);
+   |             ------------ ^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
+   |             |
+   |             required by a bound introduced by this call
+   |
+   = help: the trait `for<'a> FnOnce<(&'a isize,)>` is not implemented for fn item `for<'a> unsafe fn(&'a isize) -> isize {square}`
+   = note: unsafe function cannot be called generically without an unsafe block
+note: required by a bound in `call_it_once`
+  --> $DIR/unboxed-closures-unsafe-extern-fn.rs:15:20
+   |
+LL | fn call_it_once<F: FnOnce(&isize) -> isize>(_: F, _: isize) -> isize {
+   |                    ^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it_once`
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0277`.