1 files changed, 31 insertions, 0 deletions
diff --git a/cortex-m-rt/tests/compile-fail/interrupt-twice.rs b/cortex-m-rt/tests/compile-fail/interrupt-twice.rs
new file mode 100644
index 0000000..b59aea9
--- /dev/null
+++ b/cortex-m-rt/tests/compile-fail/interrupt-twice.rs
@@ -0,0 +1,31 @@
+#![allow(non_camel_case_types)]
+#![no_main]
+#![no_std]
+
+extern crate cortex_m_rt;
+extern crate panic_halt;
+
+use cortex_m_rt::{entry, interrupt};
+
+#[entry]
+fn foo() -> ! {
+    loop {}
+}
+
+enum interrupt {
+    USART1,
+}
+
+#[interrupt]
+fn USART1() {}
+
+pub mod reachable {
+    use cortex_m_rt::interrupt;
+
+    enum interrupt {
+        USART1,
+    }
+
+    #[interrupt] //~ ERROR symbol `USART1` is already defined
+    fn USART1() {}
+}