bless the tests and add a new one

4 files changed, 41 insertions, 4 deletions

diff --git a/tests/ui/c-variadic/fn-item-diagnostic-issue-69232.rs b/tests/ui/c-variadic/fn-item-diagnostic-issue-69232.rs
new file mode 100644
index 00000000000..d0ef91b22b2
--- /dev/null
+++ b/tests/ui/c-variadic/fn-item-diagnostic-issue-69232.rs
@@ -0,0 +1,13 @@
+// https://github.com/rust-lang/rust/issues/69232
+
+extern "C" {
+    fn foo(x: usize, ...);
+}
+
+fn test() -> u8 {
+    127
+}
+
+fn main() {
+    unsafe { foo(1, test) }; //~ ERROR can't pass a function item to a variadic function
+}
diff --git a/tests/ui/c-variadic/fn-item-diagnostic-issue-69232.stderr b/tests/ui/c-variadic/fn-item-diagnostic-issue-69232.stderr
new file mode 100644
index 00000000000..6aa1c8a1091
--- /dev/null
+++ b/tests/ui/c-variadic/fn-item-diagnostic-issue-69232.stderr
@@ -0,0 +1,16 @@
+error[E0617]: can't pass a function item to a variadic function
+  --> $DIR/fn-item-diagnostic-issue-69232.rs:12:21
+   |
+LL |     unsafe { foo(1, test) };
+   |                     ^^^^
+   |
+   = help: a function item is zero-sized and needs to be cast into a function pointer to be used in FFI
+   = note: for more information on function items, visit https://doc.rust-lang.org/reference/types/function-item.html
+help: use a function pointer instead
+   |
+LL |     unsafe { foo(1, test as fn() -> u8) };
+   |                          +++++++++++++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0617`.
diff --git a/tests/ui/c-variadic/issue-32201.rs b/tests/ui/c-variadic/issue-32201.rs
index f27bb1c2eb5..434711b7523 100644
--- a/tests/ui/c-variadic/issue-32201.rs
+++ b/tests/ui/c-variadic/issue-32201.rs
@@ -7,7 +7,8 @@ fn bar(_: *const u8) {}
 fn main() {
     unsafe {
         foo(0, bar);
-        //~^ ERROR can't pass `fn(*const u8) {bar}` to variadic function
-        //~| HELP cast the value to `fn(*const u8)`
+        //~^ ERROR can't pass a function item to a variadic function
+        //~| HELP a function item is zero-sized and needs to be cast into a function pointer to be used in FFI
+        ////~| HELP use a function pointer instead
     }
 }
diff --git a/tests/ui/c-variadic/issue-32201.stderr b/tests/ui/c-variadic/issue-32201.stderr
index 352db9f62f6..1cd85d7f07a 100644
--- a/tests/ui/c-variadic/issue-32201.stderr
+++ b/tests/ui/c-variadic/issue-32201.stderr
@@ -1,8 +1,15 @@
-error[E0617]: can't pass `fn(*const u8) {bar}` to variadic function
+error[E0617]: can't pass a function item to a variadic function
   --> $DIR/issue-32201.rs:9:16
    |
 LL |         foo(0, bar);
-   |                ^^^ help: cast the value to `fn(*const u8)`: `bar as fn(*const u8)`
+   |                ^^^
+   |
+   = help: a function item is zero-sized and needs to be cast into a function pointer to be used in FFI
+   = note: for more information on function items, visit https://doc.rust-lang.org/reference/types/function-item.html
+help: use a function pointer instead
+   |
+LL |         foo(0, bar as fn(*const u8));
+   |                    ++++++++++++++++
 
 error: aborting due to 1 previous error