[rustc.git] / compiler / rustc_error_codes / src / error_codes / E0093.md

An unknown intrinsic function was declared.

Erroneous code example:

```compile_fail,E0093
#![feature(intrinsics)]

extern "rust-intrinsic" {
    fn foo(); // error: unrecognized intrinsic function: `foo`
}

fn main() {
    unsafe {
        foo();
    }
}
```

Please check you didn't make a mistake in the function's name. All intrinsic
functions are defined in `compiler/rustc_codegen_llvm/src/intrinsic.rs` and in
`library/core/src/intrinsics.rs` in the Rust source code. Example:

```
#![feature(intrinsics)]

extern "rust-intrinsic" {
    fn atomic_fence_seqcst(); // ok!
}

fn main() {
    unsafe {
        atomic_fence_seqcst();
    }
}
```
Commit	Line	Data
60c5eb7d XL	1	An unknown intrinsic function was declared.
	2
	3	Erroneous code example:
	4
	5	```compile_fail,E0093
	6	#![feature(intrinsics)]
	7
	8	extern "rust-intrinsic" {
	9	fn foo(); // error: unrecognized intrinsic function: `foo`
	10	}
	11
	12	fn main() {
	13	unsafe {
	14	foo();
	15	}
	16	}
	17	```
	18
	19	Please check you didn't make a mistake in the function's name. All intrinsic
1b1a35ee XL	20	functions are defined in `compiler/rustc_codegen_llvm/src/intrinsic.rs` and in
1b1a35ee XL	21	`library/core/src/intrinsics.rs` in the Rust source code. Example:
60c5eb7d XL	22
	23	```
	24	#![feature(intrinsics)]
	25
	26	extern "rust-intrinsic" {
064997fb	27	fn atomic_fence_seqcst(); // ok!
60c5eb7d XL	28	}
	29
	30	fn main() {
	31	unsafe {
064997fb	32	atomic_fence_seqcst();
60c5eb7d XL	33	}
	34	}
	35	```