[INFO] cloning repository https://github.com/lng2020/rustByExample
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lng2020/rustByExample" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flng2020%2FrustByExample", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flng2020%2FrustByExample'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1f066ae79581755e868e248d3c3288fc3a4e60d7
[INFO] checking lng2020/rustByExample against try#3298c2ca5e390fd0d104357fdeec514a152a9561 for pr-136490
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flng2020%2FrustByExample" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lng2020/rustByExample on toolchain 3298c2ca5e390fd0d104357fdeec514a152a9561
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3298c2ca5e390fd0d104357fdeec514a152a9561" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lng2020/rustByExample
[INFO] finished tweaking git repo https://github.com/lng2020/rustByExample
[INFO] tweaked toml for git repo https://github.com/lng2020/rustByExample written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/lng2020/rustByExample 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" "+3298c2ca5e390fd0d104357fdeec514a152a9561" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr] warning: /workspace/builds/worker-6-tc2/source/ch18/Cargo.toml: file `/workspace/builds/worker-6-tc2/source/ch18/question_mark.rs` found to be present in multiple build targets:
[INFO] [stderr]   * `bin` target `define_err`
[INFO] [stderr]   * `bin` target `question_mark`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking lng2020/rustByExample against try#3298c2ca5e390fd0d104357fdeec514a152a9561 for pr-136490
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flng2020%2FrustByExample" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lng2020/rustByExample on toolchain 3298c2ca5e390fd0d104357fdeec514a152a9561
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3298c2ca5e390fd0d104357fdeec514a152a9561" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lng2020/rustByExample
[INFO] finished tweaking git repo https://github.com/lng2020/rustByExample
[INFO] tweaked toml for git repo https://github.com/lng2020/rustByExample written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/lng2020/rustByExample 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" "+3298c2ca5e390fd0d104357fdeec514a152a9561" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr] warning: /workspace/builds/worker-6-tc2/source/ch18/Cargo.toml: file `/workspace/builds/worker-6-tc2/source/ch18/question_mark.rs` found to be present in multiple build targets:
[INFO] [stderr]   * `bin` target `define_err`
[INFO] [stderr]   * `bin` target `question_mark`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+3298c2ca5e390fd0d104357fdeec514a152a9561" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9fd51306f1942da73e049316006b4a35615b0fa03e0f90d26986d3df579ada11
[INFO] running `Command { std: "docker" "start" "-a" "9fd51306f1942da73e049316006b4a35615b0fa03e0f90d26986d3df579ada11", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9fd51306f1942da73e049316006b4a35615b0fa03e0f90d26986d3df579ada11", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9fd51306f1942da73e049316006b4a35615b0fa03e0f90d26986d3df579ada11", kill_on_drop: false }`
[INFO] [stdout] 9fd51306f1942da73e049316006b4a35615b0fa03e0f90d26986d3df579ada11
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+3298c2ca5e390fd0d104357fdeec514a152a9561" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d68a615d6c27bc0b670bcf0e06e72e6f1f7bf61f05b9b35ca4053dba2f20bfae
[INFO] running `Command { std: "docker" "start" "-a" "d68a615d6c27bc0b670bcf0e06e72e6f1f7bf61f05b9b35ca4053dba2f20bfae", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr] warning: /opt/rustwide/workdir/ch18/Cargo.toml: file `/opt/rustwide/workdir/ch18/question_mark.rs` found to be present in multiple build targets:
[INFO] [stderr]   * `bin` target `define_err`
[INFO] [stderr]   * `bin` target `question_mark`
[INFO] [stderr]     Checking ch18 v0.1.0 (/opt/rustwide/workdir/ch18)
[INFO] [stderr]     Checking ch9 v0.1.0 (/opt/rustwide/workdir/ch9)
[INFO] [stderr]     Checking ch8 v0.1.0 (/opt/rustwide/workdir/ch8)
[INFO] [stderr]     Checking ch2 v0.1.0 (/opt/rustwide/workdir/ch2)
[INFO] [stderr]     Checking ch17 v0.1.0 (/opt/rustwide/workdir/ch17)
[INFO] [stderr]     Checking ch15 v0.1.0 (/opt/rustwide/workdir/ch15)
[INFO] [stderr]     Checking ch16 v0.1.0 (/opt/rustwide/workdir/ch16)
[INFO] [stderr]     Checking ch14 v0.1.0 (/opt/rustwide/workdir/ch14)
[INFO] [stderr]     Checking ch5 v0.1.0 (/opt/rustwide/workdir/ch5)
[INFO] [stdout] warning: field `contents` is never read
[INFO] [stdout]  --> ch9/struct_visibility.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub struct ClosedBox<T> {
[INFO] [stdout]   |                --------- field in this struct
[INFO] [stdout] 7 |         contents: T,
[INFO] [stdout]   |         ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch1 v0.1.0 (/opt/rustwide/workdir/ch1)
[INFO] [stdout] warning: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]  --> ch2/tuple.rs:7:15
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Matrix(f32, f32, f32, f32);
[INFO] [stdout]   |        ------ ^^^  ^^^  ^^^  ^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        fields in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing these fields
[INFO] [stdout]   = note: `Matrix` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch3 v0.1.0 (/opt/rustwide/workdir/ch3)
[INFO] [stderr]     Checking ch7 v0.1.0 (/opt/rustwide/workdir/ch7)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> ch15/bounds.rs:4:23
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Ref<'a, T: 'a>(&'a T);
[INFO] [stdout]   |        ---            ^^^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout]   = note: `Ref` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: couldn't read `ch3/type_alias.rs`: No such file or directory (os error 2)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ch3` (bin "type_alias") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: field `contents` is never read
[INFO] [stdout]  --> ch9/struct_visibility.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub struct ClosedBox<T> {
[INFO] [stdout]   |                --------- field in this struct
[INFO] [stdout] 7 |         contents: T,
[INFO] [stdout]   |         ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> ch15/bounds.rs:4:23
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Ref<'a, T: 'a>(&'a T);
[INFO] [stdout]   |        ---            ^^^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout]   = note: `Ref` has a derived impl for the trait `Debug`, 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: fields `0`, `1`, `2`, and `3` are never read
[INFO] [stdout]  --> ch2/tuple.rs:7:15
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Matrix(f32, f32, f32, f32);
[INFO] [stdout]   |        ------ ^^^  ^^^  ^^^  ^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        fields in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing these fields
[INFO] [stdout]   = note: `Matrix` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d68a615d6c27bc0b670bcf0e06e72e6f1f7bf61f05b9b35ca4053dba2f20bfae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d68a615d6c27bc0b670bcf0e06e72e6f1f7bf61f05b9b35ca4053dba2f20bfae", kill_on_drop: false }`
[INFO] [stdout] d68a615d6c27bc0b670bcf0e06e72e6f1f7bf61f05b9b35ca4053dba2f20bfae