embassy-executor: add macro ui test for unsafe ops in unsafe tasks

Check if the #[task] macro properly handles unsafe functions so the `unsafe_op_in_unsafe_fn` lint still works

3 files changed, 30 insertions, 0 deletions

diff --git a/embassy-executor/tests/ui.rs b/embassy-executor/tests/ui.rs
index 8b83cd368..5486a0624 100644
--- a/embassy-executor/tests/ui.rs
+++ b/embassy-executor/tests/ui.rs
@@ -32,5 +32,7 @@ fn ui() {
     t.compile_fail("tests/ui/self.rs");
     t.compile_fail("tests/ui/type_error.rs");
     t.compile_fail("tests/ui/where_clause.rs");
+    t.compile_fail("tests/ui/unsafe_op_in_unsafe_task.rs");
+
     t.pass("tests/ui/task_safety_attribute.rs");
 }
diff --git a/embassy-executor/tests/ui/unsafe_op_in_unsafe_task.rs b/embassy-executor/tests/ui/unsafe_op_in_unsafe_task.rs
new file mode 100644
index 000000000..ee7924838
--- /dev/null
+++ b/embassy-executor/tests/ui/unsafe_op_in_unsafe_task.rs
@@ -0,0 +1,10 @@
+#![cfg_attr(feature = "nightly", feature(impl_trait_in_assoc_type))]
+#![deny(unsafe_op_in_unsafe_fn)]
+
+#[embassy_executor::task]
+async unsafe fn task() {
+    let x = 5;
+    (&x as *const i32).read();
+}
+
+fn main() {}
diff --git a/embassy-executor/tests/ui/unsafe_op_in_unsafe_task.stderr b/embassy-executor/tests/ui/unsafe_op_in_unsafe_task.stderr
new file mode 100644
index 000000000..d987a4b95
--- /dev/null
+++ b/embassy-executor/tests/ui/unsafe_op_in_unsafe_task.stderr
@@ -0,0 +1,18 @@
+error[E0133]: call to unsafe function `std::ptr::const_ptr::<impl *const T>::read` is unsafe and requires unsafe block
+ --> tests/ui/unsafe_op_in_unsafe_task.rs:7:5
+  |
+7 |     (&x as *const i32).read();
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^ call to unsafe function
+  |
+  = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/unsafe-op-in-unsafe-fn.html>
+  = note: consult the function's documentation for information on how to avoid undefined behavior
+note: an unsafe function restricts its caller, but its body is safe by default
+ --> tests/ui/unsafe_op_in_unsafe_task.rs:5:1
+  |
+5 | async unsafe fn task() {
+  | ^^^^^^^^^^^^^^^^^^^^^^
+note: the lint level is defined here
+ --> tests/ui/unsafe_op_in_unsafe_task.rs:2:9
+  |
+2 | #![deny(unsafe_op_in_unsafe_fn)]
+  |         ^^^^^^^^^^^^^^^^^^^^^^