[INFO] fetching crate rocket_contrib 0.4.11...
[INFO] checking rocket_contrib-0.4.11 against master#35936c4839dd272646394779d151e060d0f6b3ac for pr-122960-1
[INFO] extracting crate rocket_contrib 0.4.11 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate rocket_contrib 0.4.11 on toolchain 35936c4839dd272646394779d151e060d0f6b3ac
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+35936c4839dd272646394779d151e060d0f6b3ac" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rocket_contrib 0.4.11
[INFO] finished tweaking crates.io crate rocket_contrib 0.4.11
[INFO] tweaked toml for crates.io crate rocket_contrib 0.4.11 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+35936c4839dd272646394779d151e060d0f6b3ac" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: failed to select a version for the requirement `pbkdf2 = "^0.2.0"`
[INFO] [stderr] candidate versions found which didn't match: 0.13.0-pre.0, 0.12.2, 0.12.1, ...
[INFO] [stderr] location searched: crates.io index
[INFO] [stderr] required by package `mongodb v0.3.12`
[INFO] [stderr]     ... which satisfies dependency `mongodb = "^0.3.12"` of package `rocket_contrib v0.4.11 (/workspace/builds/worker-2-tc1/source)`
[INFO] [stderr] if you are looking for the prerelease package it needs to be specified explicitly
[INFO] [stderr]     pbkdf2 = { version = "0.13.0-pre.0" }
[INFO] [stderr] perhaps a crate was updated and forgotten to be re-vendored?
[ERROR] this task or one of its parent failed!
[ERROR] overridden task result to broken:yanked
[ERROR] caused by: the crate depends on yanked dependencies
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.