[INFO] fetching crate jsoncanvas 0.1.6...
[INFO] checking jsoncanvas-0.1.6 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate jsoncanvas 0.1.6 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate jsoncanvas 0.1.6
[INFO] finished tweaking crates.io crate jsoncanvas 0.1.6
[INFO] tweaked toml for crates.io crate jsoncanvas 0.1.6 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate jsoncanvas 0.1.6 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 jsoncanvas 0.1.6 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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] b011dee2b5e83893f365a92bae9b6d1acbfa17fafa0188561ce1ec169fea2e06
[INFO] running `Command { std: "docker" "start" "-a" "b011dee2b5e83893f365a92bae9b6d1acbfa17fafa0188561ce1ec169fea2e06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b011dee2b5e83893f365a92bae9b6d1acbfa17fafa0188561ce1ec169fea2e06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b011dee2b5e83893f365a92bae9b6d1acbfa17fafa0188561ce1ec169fea2e06", kill_on_drop: false }`
[INFO] [stdout] b011dee2b5e83893f365a92bae9b6d1acbfa17fafa0188561ce1ec169fea2e06
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 9f482c94cab59451073ad116f5464e5bdc41fc2bb85e2f085b171e6725ae2456
[INFO] running `Command { std: "docker" "start" "-a" "9f482c94cab59451073ad116f5464e5bdc41fc2bb85e2f085b171e6725ae2456", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.79
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]     Checking tinyvec v1.6.0
[INFO] [stderr]    Compiling either v1.10.0
[INFO] [stderr]    Compiling thiserror v1.0.58
[INFO] [stderr]    Compiling serde_json v1.0.114
[INFO] [stderr]     Checking ryu v1.0.17
[INFO] [stderr]    Compiling itertools v0.10.5
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling syn v2.0.52
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking unicode-normalization v0.1.23
[INFO] [stderr]     Checking idna v0.5.0
[INFO] [stderr]    Compiling darling_core v0.20.8
[INFO] [stderr]    Compiling serde_derive v1.0.197
[INFO] [stderr]    Compiling thiserror-impl v1.0.58
[INFO] [stderr]    Compiling ambassador v0.3.6
[INFO] [stderr]    Compiling darling_macro v0.20.8
[INFO] [stderr]    Compiling darling v0.20.8
[INFO] [stderr]    Compiling serde_with_macros v3.7.0
[INFO] [stderr]     Checking serde_with v3.7.0
[INFO] [stderr]     Checking hex_color v3.0.0
[INFO] [stderr]     Checking url v2.5.0
[INFO] [stderr]     Checking jsoncanvas v0.1.6 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> bin/serial.rs:54:14
[INFO] [stdout]    |
[INFO] [stdout] 54 |         Some("#here".parse().unwrap()),
[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 `jsoncanvas` (bin "serial") 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<std::string::String, Infallible>
[INFO] [stdout]   --> bin/serial.rs:54:14
[INFO] [stdout]    |
[INFO] [stdout] 54 |         Some("#here".parse().unwrap()),
[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 `jsoncanvas` (bin "serial" test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "9f482c94cab59451073ad116f5464e5bdc41fc2bb85e2f085b171e6725ae2456", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f482c94cab59451073ad116f5464e5bdc41fc2bb85e2f085b171e6725ae2456", kill_on_drop: false }`
[INFO] [stdout] 9f482c94cab59451073ad116f5464e5bdc41fc2bb85e2f085b171e6725ae2456