(cd /home/phcoder/grub/grub-core/rust; RUSTFLAGS="-C linker=gcc -Zregparm=3 -C link-args=-nostdlib" cargo build --target-dir=/home/phcoder/builds/m3rust/grub-core/rust --workspace --target=i586-unknown-linux-gnu -Z build-std=core,alloc -r)
   Compiling grub v0.1.0 (/home/phcoder/grub/grub-core/rust/grub_rust_core)
error: expected `fn`, found `grubcall`
  --> grub_rust_core/src/lib.rs:38:15
   |
38 | unsafe extern grubcall!() {
   |               ^^^^^^^^ expected `fn`

error: could not compile `grub` (lib) due to 1 previous error

macro_rules! grubcall {
    () => {
        "stdcall"
    };
}

unsafe extern grubcall!() {
    static grub_xputs: extern "stdcall" fn(stri: *const c_char);
    fn grub_abort();