Tracking Issue for `VaArgSafe` in bounds (`v_variadic_va_arg_safe`)
Author: maxdexhCreated Sep 17, 2026Updated Sep 17, 2026
LabelsC-tracking-issueT-libsS-tracking-unimplemented
Feature gate: #![feature(v_variadic_va_arg_safe)]
This is a tracking issue for the VaArgSafe trait (part of rust-lang/rfcs#2137).
Public API
// core::ffi, reexported in std::ffi
pub impl(self) unsafe trait VaArgSafe {}
Steps / History
- Implementation: #57760
- Destabilization PR: #162909
- Final comment period (FCP)^1
- Stabilization PR
Unresolved Questions
- Should references implement the trait? (discussion in https://github.com/rust-lang/rust/issues/162478)
- #153646
Source: rust-lang/rust