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36d37966df
Split out the `extern_system_varargs` feature After the stabilization PR was opened, `extern "system"` functions were added to `extended_varargs_abi_support`. This has a number of questions regarding it that were not discussed and were somewhat surprising. It deserves to be considered as its own feature, separate from `extended_varargs_abi_support`. Tracking issue: - https://github.com/rust-lang/rust/issues/136946
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.