1 files changed, 26 insertions, 0 deletions
diff --git a/src/test/ui/typeck/issue-84768.stderr b/src/test/ui/typeck/issue-84768.stderr
new file mode 100644
index 000000000..04dc0e365
--- /dev/null
+++ b/src/test/ui/typeck/issue-84768.stderr
@@ -0,0 +1,26 @@
+error[E0229]: associated type bindings are not allowed here
+  --> $DIR/issue-84768.rs:7:11
+   |
+LL |     <F as FnOnce(&mut u8)>::call_once(f, 1)
+   |           ^^^^^^^^^^^^^^^ associated type not allowed here
+
+error[E0308]: mismatched types
+  --> $DIR/issue-84768.rs:7:42
+   |
+LL |     <F as FnOnce(&mut u8)>::call_once(f, 1)
+   |     ---------------------------------    ^ expected tuple, found integer
+   |     |
+   |     arguments to this function are incorrect
+   |
+   = note: expected tuple `(&mut u8,)`
+               found type `{integer}`
+note: associated function defined here
+  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
+   |
+LL |     extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
+   |                           ^^^^^^^^^
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0229, E0308.
+For more information about an error, try `rustc --explain E0229`.