[INFO] cloning repository https://github.com/BurntSushi/rust-cmail
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/BurntSushi/rust-cmail" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBurntSushi%2Frust-cmail", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBurntSushi%2Frust-cmail'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 64ff384418099dc824f93488876b9503791e327e
[INFO] checking BurntSushi/rust-cmail against try#32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d for pr-83312
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBurntSushi%2Frust-cmail" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/BurntSushi/rust-cmail on toolchain 32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/BurntSushi/rust-cmail
[INFO] finished tweaking git repo https://github.com/BurntSushi/rust-cmail
[INFO] tweaked toml for git repo https://github.com/BurntSushi/rust-cmail written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/BurntSushi/rust-cmail already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded smallvec v0.6.3
[INFO] [stderr]   Downloaded regex v1.0.2
[INFO] [stderr]   Downloaded docopt v1.0.0
[INFO] [stderr]   Downloaded crossbeam-epoch v0.5.1
[INFO] [stderr]   Downloaded crossbeam-channel v0.2.3
[INFO] [stderr]   Downloaded arc-swap v0.2.0
[INFO] [stderr]   Downloaded crossbeam-utils v0.4.1
[INFO] [stderr]   Downloaded signal-hook v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:4f92631de1aa59f8320307485d3b3c869a5c90ab1d76ce2cffab9807b8c9a1fb" "/opt/rustwide/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 545a02b04cd01caa8b69af3c974f66ba68a3db3f317d390dd58151c4e8163d44
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "545a02b04cd01caa8b69af3c974f66ba68a3db3f317d390dd58151c4e8163d44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "545a02b04cd01caa8b69af3c974f66ba68a3db3f317d390dd58151c4e8163d44", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "545a02b04cd01caa8b69af3c974f66ba68a3db3f317d390dd58151c4e8163d44", kill_on_drop: false }`
[INFO] [stdout] 545a02b04cd01caa8b69af3c974f66ba68a3db3f317d390dd58151c4e8163d44
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:4f92631de1aa59f8320307485d3b3c869a5c90ab1d76ce2cffab9807b8c9a1fb" "/opt/rustwide/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b6a6b1d77af55be055e4c2f0e4c96bda5d3dc025fa6344c61ff99b60fcdabb7e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b6a6b1d77af55be055e4c2f0e4c96bda5d3dc025fa6344c61ff99b60fcdabb7e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking lazy_static v1.0.2
[INFO] [stderr]    Compiling regex v1.0.2
[INFO] [stderr]    Compiling serde v1.0.70
[INFO] [stderr]     Checking rand_core v0.2.1
[INFO] [stderr]     Checking crossbeam-utils v0.4.1
[INFO] [stderr]     Checking cfg-if v0.1.4
[INFO] [stderr]     Checking arc-swap v0.2.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.9
[INFO] [stderr]     Checking smallvec v0.6.3
[INFO] [stderr]     Checking aho-corasick v0.6.6
[INFO] [stderr]     Checking thread_local v0.3.5
[INFO] [stderr]     Checking rand v0.5.4
[INFO] [stderr]     Checking signal-hook v0.1.2
[INFO] [stderr]     Checking crossbeam-epoch v0.5.1
[INFO] [stderr]     Checking parking_lot_core v0.2.14
[INFO] [stderr]    Compiling quote v0.6.4
[INFO] [stderr]     Checking parking_lot v0.5.5
[INFO] [stderr]    Compiling syn v0.14.5
[INFO] [stderr]     Checking crossbeam-channel v0.2.3
[INFO] [stderr]    Compiling serde_derive v1.0.70
[INFO] [stderr]     Checking docopt v1.0.0
[INFO] [stderr]     Checking cmail v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> cmail.rs:50:47
[INFO] [stdout]    |
[INFO] [stdout] 50 | type Result<T> = ::std::result::Result<T, Box<Error + Send + Sync>>;
[INFO] [stdout]    |                                               ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Error + Send + Sync`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> cmail.rs:369:25
[INFO] [stdout]     |
[INFO] [stdout] 369 |     fn wtr(self) -> Box<io::Write> {
[INFO] [stdout]     |                         ^^^^^^^^^ help: use `dyn`: `dyn io::Write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> cmail.rs:50:47
[INFO] [stdout]    |
[INFO] [stdout] 50 | type Result<T> = ::std::result::Result<T, Box<Error + Send + Sync>>;
[INFO] [stdout]    |                                               ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Error + Send + Sync`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> cmail.rs:369:25
[INFO] [stdout]     |
[INFO] [stdout] 369 |     fn wtr(self) -> Box<io::Write> {
[INFO] [stdout]     |                         ^^^^^^^^^ help: use `dyn`: `dyn io::Write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 22.05s
[INFO] running `Command { std: "docker" "inspect" "b6a6b1d77af55be055e4c2f0e4c96bda5d3dc025fa6344c61ff99b60fcdabb7e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6a6b1d77af55be055e4c2f0e4c96bda5d3dc025fa6344c61ff99b60fcdabb7e", kill_on_drop: false }`
[INFO] [stdout] b6a6b1d77af55be055e4c2f0e4c96bda5d3dc025fa6344c61ff99b60fcdabb7e