We got a test working for panicking with the appropriate number fo failures. Ultimatly we want:

+ An error maessage that says what the failures were
+ Not panicking (so these are effectively error productions)

compiler/test_gen/src/tests.rs

@@ -23,6 +23,11 @@ pub unsafe fn roc_alloc(size: usize, _alignment: u32) -> *mut c_void {
     libc::malloc(size)
 }
 
+#[no_mangle]
+pub unsafe fn roc_memcpy(dest: *mut c_void, src: *const c_void, bytes: usize) -> *mut c_void {
+    libc::memcpy(dest, src, bytes)
+}
+
 #[no_mangle]
 pub unsafe fn roc_realloc(
     c_ptr: *mut c_void,