[INFO] cloning repository https://github.com/KlotzAndrew/concur
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KlotzAndrew/concur" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKlotzAndrew%2Fconcur", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKlotzAndrew%2Fconcur'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 91d606d7c2bfb42b5d83464c6b5a4f6da33b5058
[INFO] checking KlotzAndrew/concur against try#409ef99a7d4dc96ae91f65d4b48413ed174514d6 for pr-137633
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKlotzAndrew%2Fconcur" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/KlotzAndrew/concur on toolchain 409ef99a7d4dc96ae91f65d4b48413ed174514d6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+409ef99a7d4dc96ae91f65d4b48413ed174514d6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/KlotzAndrew/concur
[INFO] finished tweaking git repo https://github.com/KlotzAndrew/concur
[INFO] tweaked toml for git repo https://github.com/KlotzAndrew/concur written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/KlotzAndrew/concur 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" "+409ef99a7d4dc96ae91f65d4b48413ed174514d6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc v0.2.45
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+409ef99a7d4dc96ae91f65d4b48413ed174514d6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f348a63b344d018c60d9d636dcdaa264ac709958dfaa4c26bcce886658300d33
[INFO] running `Command { std: "docker" "start" "-a" "f348a63b344d018c60d9d636dcdaa264ac709958dfaa4c26bcce886658300d33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f348a63b344d018c60d9d636dcdaa264ac709958dfaa4c26bcce886658300d33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f348a63b344d018c60d9d636dcdaa264ac709958dfaa4c26bcce886658300d33", kill_on_drop: false }`
[INFO] [stdout] f348a63b344d018c60d9d636dcdaa264ac709958dfaa4c26bcce886658300d33
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+409ef99a7d4dc96ae91f65d4b48413ed174514d6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5bc70057d8b8cca5e85a23878a5835b796ae6e83cfc8b565809f45fae8f65ef9
[INFO] running `Command { std: "docker" "start" "-a" "5bc70057d8b8cca5e85a23878a5835b796ae6e83cfc8b565809f45fae8f65ef9", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.45
[INFO] [stderr]     Checking rand_core v0.3.0
[INFO] [stderr]     Checking rand_core v0.2.2
[INFO] [stderr]     Checking rand v0.5.5
[INFO] [stderr]     Checking uuid v0.7.1
[INFO] [stderr]     Checking concur v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/or_set.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut element = self.elements.entry(value.to_string()).or_insert(Element{version: 0, removed: true});
[INFO] [stdout]    |         ----^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/or_set.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut element = self.elements.entry(value.to_string()).or_insert(Element{version: 0, removed: true});
[INFO] [stdout]    |         ----^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `id` is never read
[INFO] [stdout]   --> src/mv_register.rs:10:3
[INFO] [stdout]    |
[INFO] [stdout] 9  | struct Element {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 10 |   id: String,
[INFO] [stdout]    |   ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Element` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `id` is never read
[INFO] [stdout]   --> src/mv_register.rs:10:3
[INFO] [stdout]    |
[INFO] [stdout] 9  | struct Element {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 10 |   id: String,
[INFO] [stdout]    |   ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Element` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.02s
[INFO] running `Command { std: "docker" "inspect" "5bc70057d8b8cca5e85a23878a5835b796ae6e83cfc8b565809f45fae8f65ef9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5bc70057d8b8cca5e85a23878a5835b796ae6e83cfc8b565809f45fae8f65ef9", kill_on_drop: false }`
[INFO] [stdout] 5bc70057d8b8cca5e85a23878a5835b796ae6e83cfc8b565809f45fae8f65ef9