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Jonathan Brouwer
c6fbd9f8a7
turn some long-deprecated -C options into errors - `-Car` has been documented to do nothing for more than 8 years (https://github.com/rust-lang/rust/commit/691ab6c5bf597e98a4bae94b9a433f029f9ca9c1) and causes a warning for more than a year (https://github.com/rust-lang/rust/pull/135126). - `-Cno-stack-check` has been made a NOP and deprecated with a warning more than 9 years ago (https://github.com/rust-lang/rust/commit/c670293630611cdf677cfc5bc9a17ba378f78b84) - `-Cinline-threshold` has been made a NOP and deprecated with a warning almost 2 years ago (https://github.com/rust-lang/rust/pull/124712). With them being ignored there's always a risk someone thinks they'll do something and they don't notice the warning. I think these have been deprecated for long enough that we can turn them into hard errors. Also change the type of these fields to `()` so there's no information here that the rest of the compiler could use. This supersedes the `rustc_lint_opt_deny_field_access` trick. MCP: https://github.com/rust-lang/compiler-team/issues/978