[INFO] cloning repository https://github.com/dax/contextswitch-types
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dax/contextswitch-types" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdax%2Fcontextswitch-types", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdax%2Fcontextswitch-types'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 974890d5f59efd257dd77faa44ec5106efcb1330
[INFO] checking dax/contextswitch-types against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdax%2Fcontextswitch-types" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dax/contextswitch-types on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dax/contextswitch-types
[INFO] finished tweaking git repo https://github.com/dax/contextswitch-types
[INFO] tweaked toml for git repo https://github.com/dax/contextswitch-types written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/dax/contextswitch-types already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5da9fe9b4b2c4ead03e6b81ed240c645c4a95670814b58c01e12996b438b4e47
[INFO] running `Command { std: "docker" "start" "-a" "5da9fe9b4b2c4ead03e6b81ed240c645c4a95670814b58c01e12996b438b4e47", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5da9fe9b4b2c4ead03e6b81ed240c645c4a95670814b58c01e12996b438b4e47", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5da9fe9b4b2c4ead03e6b81ed240c645c4a95670814b58c01e12996b438b4e47", kill_on_drop: false }`
[INFO] [stdout] 5da9fe9b4b2c4ead03e6b81ed240c645c4a95670814b58c01e12996b438b4e47
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4df61a88b75559715af841c010ce679f150e83f4505e5945615af3a487fa1c6a
[INFO] running `Command { std: "docker" "start" "-a" "4df61a88b75559715af841c010ce679f150e83f4505e5945615af3a487fa1c6a", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling syn v1.0.85
[INFO] [stderr]    Compiling serde_derive v1.0.133
[INFO] [stderr]    Compiling serde v1.0.133
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]     Checking itoa v1.0.1
[INFO] [stderr]    Compiling serde_json v1.0.74
[INFO] [stderr]     Checking ryu v1.0.9
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking http v0.2.6
[INFO] [stderr]    Compiling quote v1.0.14
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking contextswitch-types v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `serde` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:66:17
[INFO] [stdout]    |
[INFO] [stdout] 66 |     use serde::{self, Deserialize, Deserializer, Serializer};
[INFO] [stdout]    |                 ^^^^ the item `serde` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:154:17
[INFO] [stdout]     |
[INFO] [stdout] 154 |     use serde::{self, Deserialize, Deserializer, Serializer};
[INFO] [stdout]     |                 ^^^^ the item `serde` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:178:17
[INFO] [stdout]     |
[INFO] [stdout] 178 |     use serde::{self, Deserialize, Deserializer, Serializer};
[INFO] [stdout]     |                 ^^^^ the item `serde` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:66:17
[INFO] [stdout]    |
[INFO] [stdout] 66 |     use serde::{self, Deserialize, Deserializer, Serializer};
[INFO] [stdout]    |                 ^^^^ the item `serde` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:154:17
[INFO] [stdout]     |
[INFO] [stdout] 154 |     use serde::{self, Deserialize, Deserializer, Serializer};
[INFO] [stdout]     |                 ^^^^ the item `serde` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde` is imported redundantly
[INFO] [stdout]    --> src/lib.rs:178:17
[INFO] [stdout]     |
[INFO] [stdout] 178 |     use serde::{self, Deserialize, Deserializer, Serializer};
[INFO] [stdout]     |                 ^^^^ the item `serde` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.23s
[INFO] running `Command { std: "docker" "inspect" "4df61a88b75559715af841c010ce679f150e83f4505e5945615af3a487fa1c6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4df61a88b75559715af841c010ce679f150e83f4505e5945615af3a487fa1c6a", kill_on_drop: false }`
[INFO] [stdout] 4df61a88b75559715af841c010ce679f150e83f4505e5945615af3a487fa1c6a