[INFO] cloning repository https://github.com/mapkts/fcc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mapkts/fcc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmapkts%2Ffcc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmapkts%2Ffcc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a2564608a232c206757e94fa64bda92fe0344430
[INFO] checking mapkts/fcc 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%2Fmapkts%2Ffcc" "/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/mapkts/fcc
[INFO] finished tweaking git repo https://github.com/mapkts/fcc
[INFO] tweaked toml for git repo https://github.com/mapkts/fcc written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/mapkts/fcc 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/mapkts/fcc 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]     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-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] f3ee205a0cb37b775771e34041a3e48b9831b74dc10063232b02d79cc1b4307a
[INFO] running `Command { std: "docker" "start" "-a" "f3ee205a0cb37b775771e34041a3e48b9831b74dc10063232b02d79cc1b4307a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f3ee205a0cb37b775771e34041a3e48b9831b74dc10063232b02d79cc1b4307a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3ee205a0cb37b775771e34041a3e48b9831b74dc10063232b02d79cc1b4307a", kill_on_drop: false }`
[INFO] [stdout] f3ee205a0cb37b775771e34041a3e48b9831b74dc10063232b02d79cc1b4307a
[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] def3fe12aad6d2e4371a42539c86dac5bbf6e206e56d22eb1fc4298596965b93
[INFO] running `Command { std: "docker" "start" "-a" "def3fe12aad6d2e4371a42539c86dac5bbf6e206e56d22eb1fc4298596965b93", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling syn v1.0.64
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]    Compiling unicode-segmentation v1.7.1
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]     Checking regex-syntax v0.6.27
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]     Checking predicates-core v1.0.0
[INFO] [stderr]     Checking normalize-line-endings v0.3.0
[INFO] [stderr]     Checking byteseeker v0.2.0
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking treeline v0.1.0
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking predicates-tree v1.0.0
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling heck v0.3.2
[INFO] [stderr]     Checking aho-corasick v0.7.19
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking float-cmp v0.6.0
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking regex v1.6.0
[INFO] [stderr]     Checking predicates v1.0.4
[INFO] [stderr]     Checking assert_cmd v1.0.1
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling thiserror-impl v1.0.24
[INFO] [stderr]    Compiling structopt-derive v0.4.14
[INFO] [stderr]     Checking thiserror v1.0.24
[INFO] [stderr]     Checking admerge v0.1.3
[INFO] [stderr]     Checking structopt v0.3.21
[INFO] [stderr]     Checking fcc v0.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:85:5
[INFO] [stdout]    |
[INFO] [stdout] 85 | /     /// Sets the skip mode
[INFO] [stdout] 86 | |     #[structopt(
[INFO] [stdout] 87 | |             long,
[INFO] [stdout] 88 | |             short = "m",
[INFO] [stdout] ...  |
[INFO] [stdout] 93 | |         )]
[INFO] [stdout] 94 | |     skip_mode: 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]   --> src/main.rs:95:5
[INFO] [stdout]    |
[INFO] [stdout] 95 | /     /// Fills some padding between each source
[INFO] [stdout] 96 | |     #[structopt(long, short = "p", display_order = 10, value_name = "STRING")]
[INFO] [stdout] 97 | |     padding: Option<String>,
[INFO] [stdout]    | |___________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/main.rs:98:5
[INFO] [stdout]     |
[INFO] [stdout]  98 | /     /// Controls where paddings should be inserted into.
[INFO] [stdout]  99 | |     #[structopt(
[INFO] [stdout] 100 | |             long,
[INFO] [stdout] 101 | |             short = "P",
[INFO] [stdout] ...   |
[INFO] [stdout] 106 | |         )]
[INFO] [stdout] 107 | |     pad_mode: String,
[INFO] [stdout]     | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/main.rs:111:5
[INFO] [stdout]     |
[INFO] [stdout] 111 | /     /// The style of newline, either unix-style `LF` or dos-style `CRLF`
[INFO] [stdout] 112 | |     #[structopt(
[INFO] [stdout] 113 | |             long,
[INFO] [stdout] 114 | |             short = "N",
[INFO] [stdout] ...   |
[INFO] [stdout] 119 | |         )]
[INFO] [stdout] 120 | |     newline_style: String,
[INFO] [stdout]     | |_________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/main.rs:85:5
[INFO] [stdout]    |
[INFO] [stdout] 85 | /     /// Sets the skip mode
[INFO] [stdout] 86 | |     #[structopt(
[INFO] [stdout] 87 | |             long,
[INFO] [stdout] 88 | |             short = "m",
[INFO] [stdout] ...  |
[INFO] [stdout] 93 | |         )]
[INFO] [stdout] 94 | |     skip_mode: 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]   --> src/main.rs:95:5
[INFO] [stdout]    |
[INFO] [stdout] 95 | /     /// Fills some padding between each source
[INFO] [stdout] 96 | |     #[structopt(long, short = "p", display_order = 10, value_name = "STRING")]
[INFO] [stdout] 97 | |     padding: Option<String>,
[INFO] [stdout]    | |___________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/main.rs:98:5
[INFO] [stdout]     |
[INFO] [stdout]  98 | /     /// Controls where paddings should be inserted into.
[INFO] [stdout]  99 | |     #[structopt(
[INFO] [stdout] 100 | |             long,
[INFO] [stdout] 101 | |             short = "P",
[INFO] [stdout] ...   |
[INFO] [stdout] 106 | |         )]
[INFO] [stdout] 107 | |     pad_mode: String,
[INFO] [stdout]     | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/main.rs:111:5
[INFO] [stdout]     |
[INFO] [stdout] 111 | /     /// The style of newline, either unix-style `LF` or dos-style `CRLF`
[INFO] [stdout] 112 | |     #[structopt(
[INFO] [stdout] 113 | |             long,
[INFO] [stdout] 114 | |             short = "N",
[INFO] [stdout] ...   |
[INFO] [stdout] 119 | |         )]
[INFO] [stdout] 120 | |     newline_style: String,
[INFO] [stdout]     | |_________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fcc` (bin "fcc" test) due to 4 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `fcc` (bin "fcc") due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "def3fe12aad6d2e4371a42539c86dac5bbf6e206e56d22eb1fc4298596965b93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "def3fe12aad6d2e4371a42539c86dac5bbf6e206e56d22eb1fc4298596965b93", kill_on_drop: false }`
[INFO] [stdout] def3fe12aad6d2e4371a42539c86dac5bbf6e206e56d22eb1fc4298596965b93
