[INFO] fetching crate cargo-tree 0.29.0...
[INFO] checking cargo-tree-0.29.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate cargo-tree 0.29.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate cargo-tree 0.29.0
[INFO] finished tweaking crates.io crate cargo-tree 0.29.0
[INFO] tweaked toml for crates.io crate cargo-tree 0.29.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate cargo-tree 0.29.0 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 cargo-tree 0.29.0 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] 691e1821c829e3c183bc4aa3de86a48b7517d2d6b2328bd05e68a56306deaec0
[INFO] running `Command { std: "docker" "start" "-a" "691e1821c829e3c183bc4aa3de86a48b7517d2d6b2328bd05e68a56306deaec0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "691e1821c829e3c183bc4aa3de86a48b7517d2d6b2328bd05e68a56306deaec0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "691e1821c829e3c183bc4aa3de86a48b7517d2d6b2328bd05e68a56306deaec0", kill_on_drop: false }`
[INFO] [stdout] 691e1821c829e3c183bc4aa3de86a48b7517d2d6b2328bd05e68a56306deaec0
[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] b4b7433c283ac1b34803d49304ffeca9cc82738141d4d9f646b68290489793fd
[INFO] running `Command { std: "docker" "start" "-a" "b4b7433c283ac1b34803d49304ffeca9cc82738141d4d9f646b68290489793fd", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.8
[INFO] [stderr]    Compiling syn v1.0.14
[INFO] [stderr]    Compiling rustversion v1.0.2
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling ryu v1.0.2
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]    Compiling anyhow v1.0.26
[INFO] [stderr]     Checking semver-parser v0.7.0
[INFO] [stderr]     Checking fixedbitset v0.1.9
[INFO] [stderr]     Checking ordermap v0.3.5
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking petgraph v0.4.13
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking serde_json v1.0.45
[INFO] [stderr]     Checking semver v0.9.0
[INFO] [stderr]    Compiling syn-mid v0.4.0
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling proc-macro-error v0.4.5
[INFO] [stderr]    Compiling proc-macro-error-attr v0.4.5
[INFO] [stderr]    Compiling structopt-derive v0.4.1
[INFO] [stderr]     Checking structopt v0.3.8
[INFO] [stderr]     Checking cargo_metadata v0.9.1
[INFO] [stderr]     Checking cargo-tree v0.29.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | /     #[structopt(long = "package", short = "p", value_name = "SPEC")]
[INFO] [stdout] 22 | |     /// Package to be used as the root of the tree
[INFO] [stdout] 23 | |     pub package: Option<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<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | /     #[structopt(long = "features", value_name = "FEATURES")]
[INFO] [stdout] 25 | |     /// Space-separated list of features to activate
[INFO] [stdout] 26 | |     pub features: Option<String>,
[INFO] [stdout]    | |________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | /     #[structopt(long = "target", value_name = "TARGET")]
[INFO] [stdout] 34 | |     /// Set the target triple
[INFO] [stdout] 35 | |     pub target: Option<String>,
[INFO] [stdout]    | |______________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | /     #[structopt(
[INFO] [stdout] 64 | |         long = "format",
[INFO] [stdout] 65 | |         short = "f",
[INFO] [stdout] 66 | |         value_name = "FORMAT",
[INFO] [stdout] ...  |
[INFO] [stdout] 69 | |     /// Format string used for printing dependencies
[INFO] [stdout] 70 | |     pub format: String,
[INFO] [stdout]    | |______________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 | /     #[structopt(long = "color", value_name = "WHEN")]
[INFO] [stdout] 78 | |     /// Coloring: auto, always, never
[INFO] [stdout] 79 | |     pub color: Option<String>,
[INFO] [stdout]    | |_____________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:89:5
[INFO] [stdout]    |
[INFO] [stdout] 89 | /     #[structopt(short = "Z", value_name = "FLAG")]
[INFO] [stdout] 90 | |     /// Unstable (nightly-only) flags to Cargo
[INFO] [stdout] 91 | |     pub unstable_flags: Vec<String>,
[INFO] [stdout]    | |___________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cargo-tree` (bin "cargo-tree" test) due to 6 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<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | /     #[structopt(long = "package", short = "p", value_name = "SPEC")]
[INFO] [stdout] 22 | |     /// Package to be used as the root of the tree
[INFO] [stdout] 23 | |     pub package: Option<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<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 | /     #[structopt(long = "features", value_name = "FEATURES")]
[INFO] [stdout] 25 | |     /// Space-separated list of features to activate
[INFO] [stdout] 26 | |     pub features: Option<String>,
[INFO] [stdout]    | |________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | /     #[structopt(long = "target", value_name = "TARGET")]
[INFO] [stdout] 34 | |     /// Set the target triple
[INFO] [stdout] 35 | |     pub target: Option<String>,
[INFO] [stdout]    | |______________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 | /     #[structopt(
[INFO] [stdout] 64 | |         long = "format",
[INFO] [stdout] 65 | |         short = "f",
[INFO] [stdout] 66 | |         value_name = "FORMAT",
[INFO] [stdout] ...  |
[INFO] [stdout] 69 | |     /// Format string used for printing dependencies
[INFO] [stdout] 70 | |     pub format: String,
[INFO] [stdout]    | |______________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:77:5
[INFO] [stdout]    |
[INFO] [stdout] 77 | /     #[structopt(long = "color", value_name = "WHEN")]
[INFO] [stdout] 78 | |     /// Coloring: auto, always, never
[INFO] [stdout] 79 | |     pub color: Option<String>,
[INFO] [stdout]    | |_____________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:89:5
[INFO] [stdout]    |
[INFO] [stdout] 89 | /     #[structopt(short = "Z", value_name = "FLAG")]
[INFO] [stdout] 90 | |     /// Unstable (nightly-only) flags to Cargo
[INFO] [stdout] 91 | |     pub unstable_flags: Vec<String>,
[INFO] [stdout]    | |___________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cargo-tree` (bin "cargo-tree") due to 6 previous errors
[INFO] running `Command { std: "docker" "inspect" "b4b7433c283ac1b34803d49304ffeca9cc82738141d4d9f646b68290489793fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4b7433c283ac1b34803d49304ffeca9cc82738141d4d9f646b68290489793fd", kill_on_drop: false }`
[INFO] [stdout] b4b7433c283ac1b34803d49304ffeca9cc82738141d4d9f646b68290489793fd
