In https://bugzilla.mozilla.org/show_bug.cgi?id=1513009 I just landed a
patch so that warnings for non-third-party Rust code get reported as
errors in automation, and thus fail to build (also if you build locally
with --enable-warnings-as-errors).
This is the equivalent of what we already do for C++ code (it's
effectively the same of building with -Werror). It will hopefully avoid
noise and catch mistakes early.
This may make slightly more painful to update Rust toolchains, but not
more than any other compiler update (plus I'm happy to help with that if
needed). I suspect that this in practice won't be a big deal since a
bunch of us build with Rust Nightly, and thus may notice and fix
warnings earlier than they get to our automation.
Anyway, let me know if you have any issues or complaints about that, and
happy warning-free builds :)
-- Emilio
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