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Revert "Stabilize `extended_varargs_abi_support`" I cannot find an FCP for this, despite it being a stabilization PR which normally means we do an FCP of some kind? It would seem reasonable for _either_ compiler or lang to have FCPed it? I am thus opening a revert PR, which mostly-cleanly applies, so that we can later actually land this properly with a stability report and FCP. - https://github.com/rust-lang/rust/issues/136896 - https://github.com/rust-lang/rust/pull/116161 - https://github.com/rust-lang/rust/issues/100189
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.