​​#[track_rfc_2091_impl]​ notes
​​for #[track_caller]​

​​tracking issue

​​previous plan: modify mir calls to tracked functions to add the argument
​​new plan: rely on codegenattrs to carry it through, handle in codegen/const

​​PRs:

​​add the feature and attribute
​​migrate appropriate callers to Instance::resolve_for_fn_ptr​
​​add core::intrinsics::caller_location​
​​implement #[track_caller]​
​​libstd uses `core::panic::Location`​ where possible.
​​Option::{expect,unwrap}​ and Result::{expect, expect_err, unwrap, unwrap_err}​ have #[track_caller]​
​​Update panic machinery (miri)

​​TODO

  • ​​Index​/IndexMut​, trait impls with track_caller?
  • ​​stabilization
​​