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c-variadic: error when we can't guarantee that the backend does the right thing tracking issue: https://github.com/rust-lang/rust/issues/44930 r? workingjubilee as discussed in [#t-lang > stabilizing `c_variadic`](https://rust-lang.zulipchat.com/#narrow/channel/213817-t-lang/topic/stabilizing.20.60c_variadic.60/with/574691397), display an error when we can't guarantee that the codegen backend (only LLVM is supported at the moment) does the right thing.