[INFO] cloning repository https://github.com/Kazuhiro-Mimaki/rust-basic-handson
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Kazuhiro-Mimaki/rust-basic-handson" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKazuhiro-Mimaki%2Frust-basic-handson", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKazuhiro-Mimaki%2Frust-basic-handson'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d0d4fd461460e6dcaeaacf30d61211a21651bbed
[INFO] checking Kazuhiro-Mimaki/rust-basic-handson against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKazuhiro-Mimaki%2Frust-basic-handson" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Kazuhiro-Mimaki/rust-basic-handson
[INFO] finished tweaking git repo https://github.com/Kazuhiro-Mimaki/rust-basic-handson
[INFO] tweaked toml for git repo https://github.com/Kazuhiro-Mimaki/rust-basic-handson written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Kazuhiro-Mimaki/rust-basic-handson on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Kazuhiro-Mimaki/rust-basic-handson 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "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]   |
[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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0a59f490ca7f0dd10c09ea02e68f33cbef6535422b3d05cee2e46b79f3bacc05
[INFO] running `Command { std: "docker" "start" "-a" "0a59f490ca7f0dd10c09ea02e68f33cbef6535422b3d05cee2e46b79f3bacc05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0a59f490ca7f0dd10c09ea02e68f33cbef6535422b3d05cee2e46b79f3bacc05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a59f490ca7f0dd10c09ea02e68f33cbef6535422b3d05cee2e46b79f3bacc05", kill_on_drop: false }`
[INFO] [stdout] 0a59f490ca7f0dd10c09ea02e68f33cbef6535422b3d05cee2e46b79f3bacc05
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c43038d39e9c68533b3e0f890c1e00117c9b7e5c6ce08c5294031024a922a3cc
[INFO] running `Command { std: "docker" "start" "-a" "c43038d39e9c68533b3e0f890c1e00117c9b7e5c6ce08c5294031024a922a3cc", 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]   |
[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]    Compiling syn v1.0.90
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]    Compiling unicode-segmentation v1.9.0
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking explain_move v0.1.0 (/opt/rustwide/workdir/explain_move)
[INFO] [stderr]     Checking cat_1 v0.1.0 (/opt/rustwide/workdir/cat_1)
[INFO] [stderr]     Checking grep_2 v0.1.0 (/opt/rustwide/workdir/grep_2)
[INFO] [stderr]     Checking cat_2 v0.1.0 (/opt/rustwide/workdir/cat_2)
[INFO] [stderr]     Checking grep_1 v0.1.0 (/opt/rustwide/workdir/grep_1)
[INFO] [stderr]    Compiling quote v1.0.17
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking rayon-core v1.9.1
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]     Checking structopt v0.3.26
[INFO] [stderr]     Checking grep_3 v0.1.0 (/opt/rustwide/workdir/grep_3)
[INFO] [stderr]     Checking grep_5 v0.1.0 (/opt/rustwide/workdir/grep_5)
[INFO] [stderr]     Checking grep_6 v0.1.0 (/opt/rustwide/workdir/grep_6)
[INFO] [stderr]     Checking grep_4 v0.1.0 (/opt/rustwide/workdir/grep_4)
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]  --> grep_3/src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | /     #[structopt(name = "PATTERN")]
[INFO] [stdout] 8 | |     pattern: String,
[INFO] [stdout]   | |___________________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> grep_3/src/main.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | /     #[structopt(name = "PATTERN2")]
[INFO] [stdout] 10 | |     path: String,
[INFO] [stdout]    | |________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `grep_3` (bin "grep_3") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]  --> grep_5/src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | /     #[structopt(name = "PATTERN")]
[INFO] [stdout] 8 | |     pattern: String,
[INFO] [stdout]   | |___________________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> grep_5/src/main.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | /     #[structopt(name = "FILE")]
[INFO] [stdout] 10 | |     path: Vec<String>,
[INFO] [stdout]    | |_____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]  --> grep_5/src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | /     #[structopt(name = "PATTERN")]
[INFO] [stdout] 8 | |     pattern: String,
[INFO] [stdout]   | |___________________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> grep_5/src/main.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | /     #[structopt(name = "FILE")]
[INFO] [stdout] 10 | |     path: Vec<String>,
[INFO] [stdout]    | |_____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]  --> grep_6/src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | /     #[structopt(name = "PATTERN")]
[INFO] [stdout] 9 | |     pattern: String,
[INFO] [stdout]   | |___________________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> grep_6/src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | /     #[structopt(name = "FILE")]
[INFO] [stdout] 11 | |     path: Vec<String>,
[INFO] [stdout]    | |_____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]  --> grep_4/src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | /     #[structopt(name = "PATTERN")]
[INFO] [stdout] 8 | |     pattern: String,
[INFO] [stdout]   | |___________________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> grep_4/src/main.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | /     #[structopt(name = "FILE")]
[INFO] [stdout] 10 | |     path: Vec<String>,
[INFO] [stdout]    | |_____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `grep_5` (bin "grep_5") due to 2 previous errors
[INFO] [stderr] error: could not compile `grep_5` (bin "grep_5" test) due to 2 previous errors
[INFO] [stderr] error: could not compile `grep_6` (bin "grep_6" test) due to 2 previous errors
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]  --> grep_3/src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | /     #[structopt(name = "PATTERN")]
[INFO] [stdout] 8 | |     pattern: String,
[INFO] [stdout]   | |___________________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> grep_3/src/main.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | /     #[structopt(name = "PATTERN2")]
[INFO] [stdout] 10 | |     path: String,
[INFO] [stdout]    | |________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]  --> grep_4/src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | /     #[structopt(name = "PATTERN")]
[INFO] [stdout] 8 | |     pattern: String,
[INFO] [stdout]   | |___________________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> grep_4/src/main.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | /     #[structopt(name = "FILE")]
[INFO] [stdout] 10 | |     path: Vec<String>,
[INFO] [stdout]    | |_____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `grep_3` (bin "grep_3" test) due to 2 previous errors
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]  --> grep_6/src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | /     #[structopt(name = "PATTERN")]
[INFO] [stdout] 9 | |     pattern: String,
[INFO] [stdout]   | |___________________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> grep_6/src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | /     #[structopt(name = "FILE")]
[INFO] [stdout] 11 | |     path: Vec<String>,
[INFO] [stdout]    | |_____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `grep_6` (bin "grep_6") due to 2 previous errors
[INFO] [stderr] error: could not compile `grep_4` (bin "grep_4") due to 2 previous errors
[INFO] [stderr] error: could not compile `grep_4` (bin "grep_4" test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "c43038d39e9c68533b3e0f890c1e00117c9b7e5c6ce08c5294031024a922a3cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c43038d39e9c68533b3e0f890c1e00117c9b7e5c6ce08c5294031024a922a3cc", kill_on_drop: false }`
[INFO] [stdout] c43038d39e9c68533b3e0f890c1e00117c9b7e5c6ce08c5294031024a922a3cc
