1 files changed, 26 insertions, 0 deletions
diff --git a/cortex-m-rt/tests/compile-fail/entry-soundness.rs b/cortex-m-rt/tests/compile-fail/entry-soundness.rs
new file mode 100644
index 0000000..9fc8ec1
--- /dev/null
+++ b/cortex-m-rt/tests/compile-fail/entry-soundness.rs
@@ -0,0 +1,26 @@
+#![no_main]
+#![no_std]
+
+extern crate cortex_m_rt;
+extern crate panic_halt;
+
+use cortex_m_rt::{entry, exception};
+
+#[entry]
+fn foo() -> ! {
+    static mut COUNT: u64 = 0;
+
+    loop {
+        if *COUNT % 2 == 0 {
+            *COUNT += 1;
+        } else {
+            *COUNT *= 2;
+        }
+    }
+}
+
+#[exception]
+fn SysTick() {
+    // If this was allowed it would lead to a data race as `SysTick` can preempt `foo`
+    foo(); //~ ERROR cannot find function `foo` in this scope
+}