relax checks of the signatures of `entry` and the exceptions

1 files changed, 16 insertions, 0 deletions

diff --git a/cortex-m-rt/examples/unsafe-exception.rs b/cortex-m-rt/examples/unsafe-exception.rs
new file mode 100644
index 0000000..d67f06f
--- /dev/null
+++ b/cortex-m-rt/examples/unsafe-exception.rs
@@ -0,0 +1,16 @@
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+
+extern crate cortex_m_rt;
+extern crate panic_semihosting;
+
+use cortex_m_rt::{entry, exception};
+
+#[entry]
+fn foo() -> ! {
+    loop {}
+}
+
+#[exception]
+unsafe fn SysTick() {}