While it hasn't seen much recent motion, there is an RFC that proposes both breaking down RUSTC_BOOTSTRAP into finer grained control, and discouraging that replacement feature less:
github.com/rust-lang/rfcs
RUSTC_ALLOW_UNSTABLE_<feature>: a RUSTC_BOOTSTRAP alternative (#3882)
master ← jyn514:rustc-bootstrap
opened 02:46AM - 22 Nov 25 UTC
jyn514
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