Define rust_eh_personality for alloc_example

x86_64-pc-windows-gnu requires it to be defined.

Author: bjorn3

example/alloc_example.rs

@@ -1,4 +1,4 @@
-#![feature(start, core_intrinsics, alloc_error_handler)]
+#![feature(start, core_intrinsics, alloc_error_handler, lang_items)]
 #![no_std]
 
 extern crate alloc;
@@ -27,6 +27,11 @@ fn alloc_error_handler(_: alloc::alloc::Layout) -> ! {
     core::intrinsics::abort();
 }
 
+#[lang = "eh_personality"]
+fn eh_personality() -> ! {
+    loop {}
+}
+
 #[start]
 fn main(_argc: isize, _argv: *const *const u8) -> isize {
     let world: Box<&str> = Box::new("Hello World!\0");