Months ago, there was a fiasco because somebody’s keynote talk was suddenly and inexplicably downgraded to a regular talk because the Rust Project “did not want to endorse” the talk, despite nominating and encouraging the speaker in the first place. This resulted in the speaker withdrawing their talk, and multiple public apologies from some of the people involved. thephd.dev/i-am-no-longer-speaking-at-rustconf-20…
Currently there is a fiasco because it turns out (one of?) the voices behind the inexplicable decision to downgrade the talk was dtolnay, lead Serde developer, who recently came under fire for publishing precompiled proc macro binaries in Serde and his response to the ensuing criticism. The perception is that dtolnay, who has done lots of work with proc macros and made several detailed suggestions as to their future in Rust, quashed the RustConf talk because he disagreed with the premise of the talk in favor of his own ideas about macros.