[INFO] fetching crate r-matrix 0.2.7...
[INFO] checking r-matrix-0.2.7 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate r-matrix 0.2.7 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate r-matrix 0.2.7
[INFO] finished tweaking crates.io crate r-matrix 0.2.7
[INFO] tweaked toml for crates.io crate r-matrix 0.2.7 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate r-matrix 0.2.7 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 crates.io crate r-matrix 0.2.7 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] dcd2faee67c0f395356801cbf8d2ed0569c74444278395f937c23a551ef47ca3
[INFO] running `Command { std: "docker" "start" "-a" "dcd2faee67c0f395356801cbf8d2ed0569c74444278395f937c23a551ef47ca3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dcd2faee67c0f395356801cbf8d2ed0569c74444278395f937c23a551ef47ca3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dcd2faee67c0f395356801cbf8d2ed0569c74444278395f937c23a551ef47ca3", kill_on_drop: false }`
[INFO] [stdout] dcd2faee67c0f395356801cbf8d2ed0569c74444278395f937c23a551ef47ca3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 6a56852668914a7685504f2557f4ddbdf19dff0b4c005447305cc089e3bcba0c
[INFO] running `Command { std: "docker" "start" "-a" "6a56852668914a7685504f2557f4ddbdf19dff0b4c005447305cc089e3bcba0c", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-ident v1.0.17
[INFO] [stderr]    Compiling cc v1.2.15
[INFO] [stderr]     Checking log v0.4.26
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking term_size v0.3.2
[INFO] [stderr]    Compiling proc-macro2 v1.0.93
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]    Compiling quote v1.0.38
[INFO] [stderr]    Compiling syn v2.0.98
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling ncurses v5.101.0
[INFO] [stderr]    Compiling signal-hook v0.3.17
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking pancurses v0.17.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]     Checking zerocopy v0.7.35
[INFO] [stderr]     Checking structopt v0.3.26
[INFO] [stderr]     Checking ppv-lite86 v0.2.20
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking r-matrix v0.2.7 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/config.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 | /     #[structopt(
[INFO] [stdout] 42 | |         short = "C",
[INFO] [stdout] 43 | |         long = "colour",
[INFO] [stdout] 44 | |         default_value = "green",
[INFO] [stdout] 45 | |         possible_values = &["green", "red", "blue", "white", "yellow", "cyan", "magenta", "black"]
[INFO] [stdout] 46 | |     )]
[INFO] [stdout] 47 | |     colour: String,
[INFO] [stdout]    | |__________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `r-matrix` (lib) due to 1 previous error
[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]   --> src/config.rs:41:5
[INFO] [stdout]    |
[INFO] [stdout] 41 | /     #[structopt(
[INFO] [stdout] 42 | |         short = "C",
[INFO] [stdout] 43 | |         long = "colour",
[INFO] [stdout] 44 | |         default_value = "green",
[INFO] [stdout] 45 | |         possible_values = &["green", "red", "blue", "white", "yellow", "cyan", "magenta", "black"]
[INFO] [stdout] 46 | |     )]
[INFO] [stdout] 47 | |     colour: String,
[INFO] [stdout]    | |__________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `r-matrix` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "6a56852668914a7685504f2557f4ddbdf19dff0b4c005447305cc089e3bcba0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a56852668914a7685504f2557f4ddbdf19dff0b4c005447305cc089e3bcba0c", kill_on_drop: false }`
[INFO] [stdout] 6a56852668914a7685504f2557f4ddbdf19dff0b4c005447305cc089e3bcba0c