add test for no global allocation

Author: beepster4096

tests/compile-fail/alloc/no_global_allocator.rs

@@ -0,0 +1,25 @@
+// Make sure we pretend the allocation symbols don't exist when there is no allocator
+
+#![feature(lang_items, start)]
+#![no_std]
+
+extern "Rust" {
+    fn __rust_alloc(size: usize, align: usize) -> *mut u8;
+}
+
+#[start]
+fn start(_: isize, _: *const *const u8) -> isize {
+    unsafe {
+        __rust_alloc(1, 1); //~ERROR: unsupported operation: can't call foreign function: __rust_alloc
+    }
+
+    0
+}
+
+#[panic_handler]
+fn panic_handler(_: &core::panic::PanicInfo) -> ! {
+    loop {}
+}
+
+#[lang = "eh_personality"]
+fn eh_personality() {}