Don't suggest explicitly cfg-gating trace! calls in bootstrap
#2269
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I was trying to learn more about bootstrap, read about the tracing macros, thought they were cool, but also writing
#[cfg(tracing)] trace!each time gets annoying.So I thought I'd PR a shim macro that hides the
cfginternally (and contribute to rustc finally), but turns out @jieyouxu has already done that in rust-lang/rust#136392Well, guess I'll be content with just a doc change for now then 🙃