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diff --git a/vendor/r-efi/examples/uefi-cross-compile.rs b/vendor/r-efi/examples/uefi-cross-compile.rs
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+++ b/vendor/r-efi/examples/uefi-cross-compile.rs
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+// Bare UEFI Compilation
+//
+// This is a copy of a cross-compile test from the upstream rust repository. It
+// is used to verify cross-compilation of UEFI targets works. It is included
+// verbatim here to make sure we can run tests against it and get notifications
+// when it breaks.
+
+// -----------------------------------------------------------------------------
+// COPY FROM `rust-lang/rust/src/test/codegen/uefi-cross-compile.rs`
+// -----------------------------------------------------------------------------
+
+// Checks whether UEFI targets cross-compile successfully.
+//
+// This test contains a simple UEFI program that simply exits with return code
+// 0. It can be easily run from the UEFI shell (but any other UEFI environment
+// works as well). This program is not run as part of the test. The test merely
+// verifies the cross-compilation does not fail and an entry-point is emitted.
+//
+// The imported definitions from the UEFI specification are intentionally left
+// incomplete. Only the bits that are actually used by this test are defined.
+
+// min-llvm-version 9.0
+
+// compile-flags: --target x86_64-unknown-uefi
+
+#![feature(lang_items, no_core)]
+#![no_core]
+#![no_main]
+
+#[lang = "sized"]
+pub trait Sized {}
+#[lang = "freeze"]
+pub trait Freeze {}
+#[lang = "copy"]
+pub trait Copy {}
+
+// CHECK: define win64cc i64 @efi_main{{.*}}
+#[export_name = "efi_main"]
+pub extern "efiapi" fn main(_h: *mut usize, _st: *mut usize) -> usize {
+    return 0;
+}