[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#ef5216c337126ffe24d074826f4023948c4a9b8e for pr-137033
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flng2020%2FrustByExample" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lng2020/rustByExample on toolchain ef5216c337126ffe24d074826f4023948c4a9b8e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ef5216c337126ffe24d074826f4023948c4a9b8e" "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-5-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" "+ef5216c337126ffe24d074826f4023948c4a9b8e" "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-5-tc2/source/ch18/Cargo.toml: file `/workspace/builds/worker-5-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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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" "+ef5216c337126ffe24d074826f4023948c4a9b8e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 566d11374b7b00dab725b09ce019c8ca358e813076d1a66d8e9216fa2d92fcd0
[INFO] running `Command { std: "docker" "start" "-a" "566d11374b7b00dab725b09ce019c8ca358e813076d1a66d8e9216fa2d92fcd0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "566d11374b7b00dab725b09ce019c8ca358e813076d1a66d8e9216fa2d92fcd0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "566d11374b7b00dab725b09ce019c8ca358e813076d1a66d8e9216fa2d92fcd0", kill_on_drop: false }`
[INFO] [stdout] 566d11374b7b00dab725b09ce019c8ca358e813076d1a66d8e9216fa2d92fcd0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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" "+ef5216c337126ffe24d074826f4023948c4a9b8e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c413eca5e3e693487f4aff9ee265b8820e8eb15aa94d01d9fdddbaa6f6aff88a
[INFO] running `Command { std: "docker" "start" "-a" "c413eca5e3e693487f4aff9ee265b8820e8eb15aa94d01d9fdddbaa6f6aff88a", 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 ch3 v0.1.0 (/opt/rustwide/workdir/ch3)
[INFO] [stderr]     Checking ch8 v0.1.0 (/opt/rustwide/workdir/ch8)
[INFO] [stderr]     Checking ch15 v0.1.0 (/opt/rustwide/workdir/ch15)
[INFO] [stderr]     Checking ch14 v0.1.0 (/opt/rustwide/workdir/ch14)
[INFO] [stderr]     Checking ch17 v0.1.0 (/opt/rustwide/workdir/ch17)
[INFO] [stderr]     Checking ch16 v0.1.0 (/opt/rustwide/workdir/ch16)
[INFO] [stderr]     Checking ch18 v0.1.0 (/opt/rustwide/workdir/ch18)
[INFO] [stderr]     Checking ch2 v0.1.0 (/opt/rustwide/workdir/ch2)
[INFO] [stderr]     Checking ch5 v0.1.0 (/opt/rustwide/workdir/ch5)
[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] [stderr]     Checking ch7 v0.1.0 (/opt/rustwide/workdir/ch7)
[INFO] [stderr]     Checking ch9 v0.1.0 (/opt/rustwide/workdir/ch9)
[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 ch6 v0.1.0 (/opt/rustwide/workdir/ch6)
[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/structs.rs:2:21
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Borrowed<'a>(&'a i32);
[INFO] [stdout]   |        --------     ^^^^^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout]   = note: `Borrowed` 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: field `0` is never read
[INFO] [stdout]   --> ch15/structs.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Num(i32),
[INFO] [stdout]    |     --- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Either` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 13 -     Num(i32),
[INFO] [stdout] 13 +     Num(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> ch15/structs.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     Ref(&'a i32),
[INFO] [stdout]    |     --- ^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Either` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 14 -     Ref(&'a i32),
[INFO] [stdout] 14 +     Ref(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]  --> ch6/from_and_into.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Number {
[INFO] [stdout]   |        ------ field in this struct
[INFO] [stdout] 5 |     value: i32,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Number` 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: field `0` is never read
[INFO] [stdout]   --> ch16/derive.rs:14:16
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct Seconds(i32);
[INFO] [stdout]    |        ------- ^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> ch15/drop.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let x = ToDrop;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` 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" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> ch15/structs.rs:2:21
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Borrowed<'a>(&'a i32);
[INFO] [stdout]   |        --------     ^^^^^^^
[INFO] [stdout]   |        |
[INFO] [stdout]   |        field in this struct
[INFO] [stdout]   |
[INFO] [stdout]   = help: consider removing this field
[INFO] [stdout]   = note: `Borrowed` 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: field `0` is never read
[INFO] [stdout]   --> ch15/structs.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Num(i32),
[INFO] [stdout]    |     --- ^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Either` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 13 -     Num(i32),
[INFO] [stdout] 13 +     Num(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> ch15/structs.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     Ref(&'a i32),
[INFO] [stdout]    |     --- ^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Either` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 14 -     Ref(&'a i32),
[INFO] [stdout] 14 +     Ref(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `number` is never read
[INFO] [stdout]   --> ch18/unpacking.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | struct PhoneNumber {
[INFO] [stdout]    |        ----------- field in this struct
[INFO] [stdout] 12 |     area_code: Option<u8>,
[INFO] [stdout] 13 |     number: u32,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PhoneNumber` 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: 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" "c413eca5e3e693487f4aff9ee265b8820e8eb15aa94d01d9fdddbaa6f6aff88a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c413eca5e3e693487f4aff9ee265b8820e8eb15aa94d01d9fdddbaa6f6aff88a", kill_on_drop: false }`
[INFO] [stdout] c413eca5e3e693487f4aff9ee265b8820e8eb15aa94d01d9fdddbaa6f6aff88a