compiler/rustc_error_codes/src/error_codes/E0737.md

   1 `#[track_caller]` requires functions to have the `"Rust"` ABI for implicitly
   2 receiving caller location. See [RFC 2091] for details on this and other
   3 restrictions.
   4
   5 Erroneous code example:
   6
   7 ```compile_fail,E0737
   8 #[track_caller]
   9 extern "C" fn foo() {}
  10 ```
  11
  12 [RFC 2091]: https://github.com/rust-lang/rfcs/blob/master/text/2091-inline-semantic.md