I filed bug 1578852 to figure out the wrench-deps failure.

Backed out changeset 70353f95adda (bug 1578596) for toolchain bustage on a CLOSED TREE.

Backout link: https://hg.mozilla.org/integration/autoland/rev/d2a9a56eaddf163e0d11d8ee2cb043791fb3e881

Push with failures: https://treeherder.mozilla.org/#/jobs?repo=autoland&group_state=expanded&resultStatus=testfailed%2Cbusted%2Cexception&revision=70353f95addadcfb6cf72cfacddadac12341e6c2&selectedJob=265001412

Log link: https://treeherder.mozilla.org/logviewer.html#?job_id=265001412&repo=autoland

Log snippet:

[task 2019-09-04T19:15:32.839Z] Finished release [optimized] target(s) in 2m 00s
[task 2019-09-04T19:15:32.854Z] Installing /builds/worker/.cargo/bin/cargo-vendor
[task 2019-09-04T19:15:32.854Z] Installed package cargo-vendor v0.1.23 (executable cargo-vendor)
[task 2019-09-04T19:15:32.913Z] warning: be sure to add /builds/worker/.cargo/bin to your PATH to be able to run the installed binaries
[task 2019-09-04T19:15:32.916Z] cd gfx/wr/
[task 2019-09-04T19:15:32.916Z] + cd gfx/wr/
[task 2019-09-04T19:15:32.916Z] mkdir .cargo
[task 2019-09-04T19:15:32.916Z] + mkdir .cargo
[task 2019-09-04T19:15:32.917Z] cargo vendor --relative-path --sync ./Cargo.lock > .cargo/config
[task 2019-09-04T19:15:32.917Z] + cargo vendor --relative-path --sync ./Cargo.lock
[task 2019-09-04T19:15:32.926Z] error: the crates.io cargo vendor command has now been merged into Cargo itself
[task 2019-09-04T19:15:32.926Z] and does not support the flag --relative-path currently; to continue using the flag you
[task 2019-09-04T19:15:32.926Z] can execute cargo-vendor vendor ..., and if you would like to see this flag
[task 2019-09-04T19:15:32.926Z] supported in Cargo itself please feel free to file an issue at
[task 2019-09-04T19:15:32.926Z] https://github.com/rust-lang/cargo/issues/new
[task 2019-09-04T19:15:32.926Z]
[fetches 2019-09-04T19:15:32.926Z] removing /builds/worker/fetches
[fetches 2019-09-04T19:15:33.082Z] finished
[taskcluster 2019-09-04 19:15:33.530Z] === Task Finished ===
[taskcluster 2019-09-04 19:15:33.651Z] Artifact "public/build" not found at "/builds/worker/artifacts/"
[taskcluster 2019-09-04 19:15:34.112Z] Unsuccessful task run with exit code: 101 completed in 187.644 seconds

https://hg.mozilla.org/mozilla-central/rev/f82b4a26b4e4