standlone: Implement __nac3_raise for demo

nac3standalone/demo/demo.rs

@@ -1,3 +1,7 @@
+use std::io;
+use std::io::Write;
+use std::process::exit;
+
 mod cslice {
     // copied from https://github.com/dherman/cslice
     use std::marker::PhantomData;
@@ -76,7 +80,13 @@ pub extern "C" fn __nac3_personality(_state: u32, _exception_object: u32, _conte
 
 #[no_mangle]
 pub extern "C" fn __nac3_raise(_state: u32, _exception_object: u32, _context: u32) -> u32 {
-    unimplemented!();
+    writeln!(io::stderr(),
+         "__nac3_raise(state: {:#010x}, _exception_object: {:#010x}, _context: {:#010x})",
+        _state,
+        _exception_object,
+        _context
+    ).unwrap();
+    exit(101);
 }
 
 extern "C" {