unmangled symbols are not escaped in naked/global assembly

[usamoi]

I tried this code:

unsafe extern "C" {
    #[link_name = "memset]; mov eax, 1; #"]
    unsafe fn inject();
}

#[unsafe(export_name = "memset]; mov eax, 1; #")]
extern "C" fn inject_() {}

#[unsafe(naked)]
extern "C" fn print_0() -> usize {
    core::arch::naked_asm!("lea rax, [{}]", "ret", sym inject)
}

#[unsafe(naked)]
extern "C" fn print_1() -> usize {
    core::arch::naked_asm!("lea rax, [{}]", "ret", sym inject_)
}

fn main() {
    dbg!(print_0());
    dbg!(print_1());
}

I expected to see this happen: rustc inserts escaped symbol names, and linker emits errors

Instead, this happened: interpolation works, and the binary prints 1\n1\n

I found this when trying to compile

unsafe extern "C" {
    #[link_name = "exit@GLIBC_2.2.5"]
    safe fn exit(status: i32) -> !;
}

#[unsafe(naked)]
extern "C" fn exit_(status: i32) {
    core::arch::naked_asm!("jmp {}", sym exit)
}

fn main() {
    exit_(0);
}

I expected to see it compiles but it doesn't. I have to escape it manually by

core::arch::naked_asm!("jmp \"{}\"", sym exit)

Meta

rustc --version --verbose:

rustc 1.93.0 (254b59607 2026-01-19)
binary: rustc
commit-hash: 254b59607d4417e9dffbc307138ae5c86280fe4c
commit-date: 2026-01-19
host: x86_64-unknown-linux-gnu
release: 1.93.0
LLVM version: 21.1.8