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An unknown intrinsic function was declared.
Erroneous code example:
```compile_fail,E0093
#![feature(intrinsics)]
#![allow(internal_features)]
#[rustc_intrinsic]
unsafe 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 `library/core/src/intrinsics` in the Rust source code.
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