[INFO] cloning repository https://github.com/pricelessjunk/rust-tutorial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/pricelessjunk/rust-tutorial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpricelessjunk%2Frust-tutorial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpricelessjunk%2Frust-tutorial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] aaf9d1b9a230968fd31e7312eb56961fd1623c3f
[INFO] checking pricelessjunk/rust-tutorial against master#506512391b1a75ae450d36c9420978402a91abcc for pr-125384
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpricelessjunk%2Frust-tutorial" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/pricelessjunk/rust-tutorial on toolchain 506512391b1a75ae450d36c9420978402a91abcc
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/pricelessjunk/rust-tutorial
[INFO] finished tweaking git repo https://github.com/pricelessjunk/rust-tutorial
[INFO] tweaked toml for git repo https://github.com/pricelessjunk/rust-tutorial written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/pricelessjunk/rust-tutorial 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" "+506512391b1a75ae450d36c9420978402a91abcc" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: profiles for the non root package will be ignored, specify profiles at the workspace root:
[INFO] [stderr] package:   /workspace/builds/worker-5-tc1/source/chapter09/Cargo.toml
[INFO] [stderr] workspace: /workspace/builds/worker-5-tc1/source/Cargo.toml
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c57f30787e52d4429301207e94f6ca1a72bef14aacd0b49b09fcdba795077afd
[INFO] running `Command { std: "docker" "start" "-a" "c57f30787e52d4429301207e94f6ca1a72bef14aacd0b49b09fcdba795077afd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c57f30787e52d4429301207e94f6ca1a72bef14aacd0b49b09fcdba795077afd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c57f30787e52d4429301207e94f6ca1a72bef14aacd0b49b09fcdba795077afd", kill_on_drop: false }`
[INFO] [stdout] c57f30787e52d4429301207e94f6ca1a72bef14aacd0b49b09fcdba795077afd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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:beeedbb442662e57d416641ecc3200b38e573c25b057896194468d05594dd835" "/opt/rustwide/cargo-home/bin/cargo" "+506512391b1a75ae450d36c9420978402a91abcc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1ab669c891d11ed4e7ef57638094dce0c1add6f89d9b1bfe351d27a4236fc8a4
[INFO] running `Command { std: "docker" "start" "-a" "1ab669c891d11ed4e7ef57638094dce0c1add6f89d9b1bfe351d27a4236fc8a4", kill_on_drop: false }`
[INFO] [stderr] warning: profiles for the non root package will be ignored, specify profiles at the workspace root:
[INFO] [stderr] package:   /opt/rustwide/workdir/chapter09/Cargo.toml
[INFO] [stderr] workspace: /opt/rustwide/workdir/Cargo.toml
[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]     Checking chapter07 v0.1.0 (/opt/rustwide/workdir/chapter07)
[INFO] [stderr]     Checking chapter05 v0.1.0 (/opt/rustwide/workdir/chapter05)
[INFO] [stderr]     Checking chapter11 v0.1.0 (/opt/rustwide/workdir/chapter11)
[INFO] [stderr]     Checking chapter03 v0.1.0 (/opt/rustwide/workdir/chapter03)
[INFO] [stderr]     Checking chapter06 v0.1.0 (/opt/rustwide/workdir/chapter06)
[INFO] [stderr]     Checking chapter10 v0.1.0 (/opt/rustwide/workdir/chapter10)
[INFO] [stderr]     Checking chapter08 v0.1.0 (/opt/rustwide/workdir/chapter08)
[INFO] [stderr]     Checking chapter12 v0.1.0 (/opt/rustwide/workdir/chapter12)
[INFO] [stderr]     Checking chapter04 v0.1.0 (/opt/rustwide/workdir/chapter04)
[INFO] [stderr]     Checking chapter09 v0.1.0 (/opt/rustwide/workdir/chapter09)
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> chapter09/src/main.rs:45:52
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn read_from_file(){
[INFO] [stdout]    | ------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] 45 |     let mut username_file = File::open("hello.txt")?;
[INFO] [stdout]    |                                                    ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> chapter09/src/main.rs:45:52
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn read_from_file(){
[INFO] [stdout]    | ------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] 45 |     let mut username_file = File::open("hello.txt")?;
[INFO] [stdout]    |                                                    ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> chapter09/src/main.rs:47:48
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn read_from_file(){
[INFO] [stdout]    | ------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 47 |     username_file.read_to_string(&mut username)?;
[INFO] [stdout]    |                                                ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> chapter09/src/main.rs:47:48
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn read_from_file(){
[INFO] [stdout]    | ------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 47 |     username_file.read_to_string(&mut username)?;
[INFO] [stdout]    |                                                ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `chapter09` (bin "chapter09" test) due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `chapter09` (bin "chapter09") due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "1ab669c891d11ed4e7ef57638094dce0c1add6f89d9b1bfe351d27a4236fc8a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ab669c891d11ed4e7ef57638094dce0c1add6f89d9b1bfe351d27a4236fc8a4", kill_on_drop: false }`
[INFO] [stdout] 1ab669c891d11ed4e7ef57638094dce0c1add6f89d9b1bfe351d27a4236fc8a4