tasks / idle have exclusive access to Threshold, but do not own the token

1 files changed, 44 insertions, 0 deletions

diff --git a/tests/cfail/local-token.rs b/tests/cfail/local-token.rs
new file mode 100644
index 00000000..4c98956b
--- /dev/null
+++ b/tests/cfail/local-token.rs
@@ -0,0 +1,44 @@
+#![deny(warnings)]
+#![feature(const_fn)]
+#![feature(proc_macro)]
+
+#[macro_use(task)]
+extern crate cortex_m_rtfm as rtfm;
+extern crate stm32f103xx;
+
+use rtfm::{app, Threshold};
+
+app! {
+    device: stm32f103xx,
+
+    tasks: {
+        EXTI0: {
+            enabled: true,
+            priority: 1,
+        },
+    }
+}
+
+fn init(_p: init::Peripherals) {}
+
+fn idle() -> ! {
+    loop {}
+}
+
+task!(EXTI0, exti0, Old {
+    token: Option<Threshold> = None;
+});
+
+fn exti0(nt: &mut Threshold, old: &mut Old, _r: EXTI0::Resources) {
+    if let Some(ot) = old.token.take() {
+        let _: (Threshold, Threshold) = (*nt, ot);
+        //~^ error cannot move out of borrowed content
+
+        return
+    }
+
+    // ERROR can't store a threshold token in a local variable, otherwise you
+    // would end up with two threshold tokens in a task (see `if let` above)
+    old.token = Some(*nt);
+    //~^ error cannot move out of borrowed content
+}