A couple of Rust targets have stopped being available since 30 Jun (e.g. i686-pc-windows-msvc and i686-unknown-linux-gnu, for example). Rust migrated from Travis to Azure and that was the first nightly released in Azure, so chances are that something might have gone wrong.

Are there any logs available that we could inspect ?

MWE: https://rust.godbolt.org/z/u_ZgbT