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fae8c6edd1
add `c_variadic_experimental_arch` feature tracking issue: https://github.com/rust-lang/rust/issues/155973 Based on https://hackmd.io/pIbUgMQuQcGaibJcinOcEw#Stabilize-c-variadic-function-definitions-rust155697, we'll gate niche targets where we don't control the implementation of `va_arg`, the ABI is unclear, or in general where we're not confident stabilizing the implementation.
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.