Github Introduce `proc_macro_back_compat` lint, and emit for `time-macros-impl`...
source link: https://github.com/rust-lang/rust/pull/83127
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Now that future-incompat-report support has landed in nightly Cargo, we
can start to make progress towards removing the various proc-macro
back-compat hacks that have accumulated in the compiler.
This PR introduces a new lint proc_macro_back_compat, which results in
a future-incompat-report entry being generated. All proc-macro
back-compat warnings will be grouped under this lint. Note that this
lint will never actually become a hard error - instead, we will remove
the special cases for various macros, which will cause older versions of
those crates to emit some other error.
I've added code to fire this lint for the time-macros-impl case. This
is the easiest case out of all of our current back-compat hacks - the
crate was renamed to time-macros, so seeing a filename withtime-macros-impl guarantees that an older version of the parent time
crate is in use.
When Cargo's future-incompat-report feature gets stabilized, affected
users will start to see future-incompat warnings when they build their
crates.
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