add compile-fail tests; test only on nightly

we'll test on beta when 1.30-beta is out

1 files changed, 17 insertions, 0 deletions

diff --git a/cortex-m-rt/tests/compile-fail/entry-twice.rs b/cortex-m-rt/tests/compile-fail/entry-twice.rs
new file mode 100644
index 0000000..b2819f6
--- /dev/null
+++ b/cortex-m-rt/tests/compile-fail/entry-twice.rs
@@ -0,0 +1,17 @@
+#![no_main]
+#![no_std]
+
+extern crate cortex_m_rt;
+extern crate panic_semihosting;
+
+use cortex_m_rt::entry;
+
+#[entry]
+fn foo() -> ! {
+    loop {}
+}
+
+#[entry] //~ ERROR symbol `main` is already defined
+fn bar() -> ! {
+    loop {}
+}