[INFO] fetching crate slog-config 0.4.0...
[INFO] checking slog-config-0.4.0 against master#8f359beca4e58bc3ae795a666301a8f47023044c for pr-121557
[INFO] extracting crate slog-config 0.4.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate slog-config 0.4.0 on toolchain 8f359beca4e58bc3ae795a666301a8f47023044c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8f359beca4e58bc3ae795a666301a8f47023044c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate slog-config 0.4.0
[INFO] finished tweaking crates.io crate slog-config 0.4.0
[INFO] tweaked toml for crates.io crate slog-config 0.4.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8f359beca4e58bc3ae795a666301a8f47023044c" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: failed to select a version for `toml`.
[INFO] [stderr]     ... required by package `slog-config v0.4.0 (/workspace/builds/worker-5-tc1/source)`
[INFO] [stderr] versions that meet the requirements `^0.4` are: 0.4.10, 0.4.9, 0.4.8, 0.4.7, 0.4.6, 0.4.5, 0.4.4, 0.4.3, 0.4.2, 0.4.1, 0.4.0
[INFO] [stderr] 
[INFO] [stderr] the package `slog-config` depends on `toml`, with features: `serde` but `toml` does not have these features.
[INFO] [stderr]  It has a required dependency with that name, but only optional dependencies can be used as features.
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `toml` which could resolve this conflict
[ERROR] this task or one of its parent failed!
[ERROR] command failed: exit status: 101
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking slog-config-0.4.0 against try#80d5fe37e16a0befb4128414cb6a11d544788c0a for pr-121557
[INFO] extracting crate slog-config 0.4.0 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate slog-config 0.4.0 on toolchain 80d5fe37e16a0befb4128414cb6a11d544788c0a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate slog-config 0.4.0
[INFO] finished tweaking crates.io crate slog-config 0.4.0
[INFO] tweaked toml for crates.io crate slog-config 0.4.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: failed to select a version for `toml`.
[INFO] [stderr]     ... required by package `slog-config v0.4.0 (/workspace/builds/worker-5-tc2/source)`
[INFO] [stderr] versions that meet the requirements `^0.4` are: 0.4.10, 0.4.9, 0.4.8, 0.4.7, 0.4.6, 0.4.5, 0.4.4, 0.4.3, 0.4.2, 0.4.1, 0.4.0
[INFO] [stderr] 
[INFO] [stderr] the package `slog-config` depends on `toml`, with features: `serde` but `toml` does not have these features.
[INFO] [stderr]  It has a required dependency with that name, but only optional dependencies can be used as features.
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `toml` which could resolve this conflict
[INFO] checking slog-config-0.4.0 against try#80d5fe37e16a0befb4128414cb6a11d544788c0a for pr-121557
[INFO] extracting crate slog-config 0.4.0 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate slog-config 0.4.0 on toolchain 80d5fe37e16a0befb4128414cb6a11d544788c0a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate slog-config 0.4.0
[INFO] finished tweaking crates.io crate slog-config 0.4.0
[INFO] tweaked toml for crates.io crate slog-config 0.4.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: failed to select a version for `toml`.
[INFO] [stderr]     ... required by package `slog-config v0.4.0 (/workspace/builds/worker-5-tc2/source)`
[INFO] [stderr] versions that meet the requirements `^0.4` are: 0.4.10, 0.4.9, 0.4.8, 0.4.7, 0.4.6, 0.4.5, 0.4.4, 0.4.3, 0.4.2, 0.4.1, 0.4.0
[INFO] [stderr] 
[INFO] [stderr] the package `slog-config` depends on `toml`, with features: `serde` but `toml` does not have these features.
[INFO] [stderr]  It has a required dependency with that name, but only optional dependencies can be used as features.
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `toml` which could resolve this conflict
[INFO] checking slog-config-0.4.0 against try#80d5fe37e16a0befb4128414cb6a11d544788c0a for pr-121557
[INFO] extracting crate slog-config 0.4.0 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate slog-config 0.4.0 on toolchain 80d5fe37e16a0befb4128414cb6a11d544788c0a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate slog-config 0.4.0
[INFO] finished tweaking crates.io crate slog-config 0.4.0
[INFO] tweaked toml for crates.io crate slog-config 0.4.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: failed to select a version for `toml`.
[INFO] [stderr]     ... required by package `slog-config v0.4.0 (/workspace/builds/worker-5-tc2/source)`
[INFO] [stderr] versions that meet the requirements `^0.4` are: 0.4.10, 0.4.9, 0.4.8, 0.4.7, 0.4.6, 0.4.5, 0.4.4, 0.4.3, 0.4.2, 0.4.1, 0.4.0
[INFO] [stderr] 
[INFO] [stderr] the package `slog-config` depends on `toml`, with features: `serde` but `toml` does not have these features.
[INFO] [stderr]  It has a required dependency with that name, but only optional dependencies can be used as features.
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `toml` which could resolve this conflict
[INFO] checking slog-config-0.4.0 against try#80d5fe37e16a0befb4128414cb6a11d544788c0a for pr-121557
[INFO] extracting crate slog-config 0.4.0 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate slog-config 0.4.0 on toolchain 80d5fe37e16a0befb4128414cb6a11d544788c0a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate slog-config 0.4.0
[INFO] finished tweaking crates.io crate slog-config 0.4.0
[INFO] tweaked toml for crates.io crate slog-config 0.4.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "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 `toml`.
[INFO] [stderr]     ... required by package `slog-config v0.4.0 (/workspace/builds/worker-5-tc2/source)`
[INFO] [stderr] versions that meet the requirements `^0.4` are: 0.4.10, 0.4.9, 0.4.8, 0.4.7, 0.4.6, 0.4.5, 0.4.4, 0.4.3, 0.4.2, 0.4.1, 0.4.0
[INFO] [stderr] 
[INFO] [stderr] the package `slog-config` depends on `toml`, with features: `serde` but `toml` does not have these features.
[INFO] [stderr]  It has a required dependency with that name, but only optional dependencies can be used as features.
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `toml` which could resolve this conflict
[INFO] checking slog-config-0.4.0 against try#80d5fe37e16a0befb4128414cb6a11d544788c0a for pr-121557
[INFO] extracting crate slog-config 0.4.0 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate slog-config 0.4.0 on toolchain 80d5fe37e16a0befb4128414cb6a11d544788c0a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate slog-config 0.4.0
[INFO] finished tweaking crates.io crate slog-config 0.4.0
[INFO] tweaked toml for crates.io crate slog-config 0.4.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+80d5fe37e16a0befb4128414cb6a11d544788c0a" "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 `toml`.
[INFO] [stderr]     ... required by package `slog-config v0.4.0 (/workspace/builds/worker-5-tc2/source)`
[INFO] [stderr] versions that meet the requirements `^0.4` are: 0.4.10, 0.4.9, 0.4.8, 0.4.7, 0.4.6, 0.4.5, 0.4.4, 0.4.3, 0.4.2, 0.4.1, 0.4.0
[INFO] [stderr] 
[INFO] [stderr] the package `slog-config` depends on `toml`, with features: `serde` but `toml` does not have these features.
[INFO] [stderr]  It has a required dependency with that name, but only optional dependencies can be used as features.
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `toml` which could resolve this conflict
[ERROR] this task or one of its parent failed!
[ERROR] command failed: exit status: 101
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.