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+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();
+    }
+}
+```