Add compilefail tests for recursive calls

Author: YuhanLiin

macros/tests/ui/recursion.rs

@@ -0,0 +1,13 @@
+#![no_main]
+
+use msp430_rt_macros::{entry, interrupt};
+
+#[entry]
+fn main(cs: CriticalSection) -> ! {
+    main(cs)
+}
+
+#[interrupt]
+fn DefaultHandler(cs: CriticalSection) -> ! {
+    DefaultHandler(cs)
+}

macros/tests/ui/recursion2.rs

@@ -0,0 +1,13 @@
+#![no_main]
+
+use msp430_rt_macros::{entry, interrupt};
+
+#[entry]
+fn main(cs: CriticalSection) -> ! {
+    main()
+}
+
+#[interrupt]
+fn DefaultHandler(cs: CriticalSection) -> ! {
+    DefaultHandler()
+}