[INFO] fetching crate elu 0.1.0...
[INFO] checking elu-0.1.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate elu 0.1.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate elu 0.1.0
[INFO] finished tweaking crates.io crate elu 0.1.0
[INFO] tweaked toml for crates.io crate elu 0.1.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate elu 0.1.0 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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] 73fdda8dbdf72f240ed043c1c0594defdd5e1926f3d29a9dc58d3db45349e5a8
[INFO] running `Command { std: "docker" "start" "-a" "73fdda8dbdf72f240ed043c1c0594defdd5e1926f3d29a9dc58d3db45349e5a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "73fdda8dbdf72f240ed043c1c0594defdd5e1926f3d29a9dc58d3db45349e5a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73fdda8dbdf72f240ed043c1c0594defdd5e1926f3d29a9dc58d3db45349e5a8", kill_on_drop: false }`
[INFO] [stdout] 73fdda8dbdf72f240ed043c1c0594defdd5e1926f3d29a9dc58d3db45349e5a8
[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] ac6eb20749bc94605ab4f5248ab5ff0aac1c0f7f4597bdaefeec75fb9c7b269a
[INFO] running `Command { std: "docker" "start" "-a" "ac6eb20749bc94605ab4f5248ab5ff0aac1c0f7f4597bdaefeec75fb9c7b269a", kill_on_drop: false }`
[INFO] [stderr]     Checking elu v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `#[must_use]` attribute cannot be used on trait methods in impl blocks
[INFO] [stdout]    --> src/forest.rs:130:5
[INFO] [stdout]     |
[INFO] [stdout] 130 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = help: `#[must_use]` can be applied to data types, foreign functions, functions, inherent methods, provided trait methods, required trait methods, traits, and unions
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` attribute cannot be used on trait methods in impl blocks
[INFO] [stdout]    --> src/forest.rs:130:5
[INFO] [stdout]     |
[INFO] [stdout] 130 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = help: `#[must_use]` can be applied to data types, foreign functions, functions, inherent methods, provided trait methods, required trait methods, traits, and unions
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<<Self as EvalLinkUpdate>::Value, Infallible>
[INFO] [stdout]   --> src/lib.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |         self.try_eval(id).unwrap()
[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<<Self as EvalLinkUpdate>::Value, Infallible>
[INFO] [stdout]   --> src/lib.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |         self.try_eval(id).unwrap()
[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<usize, Infallible>
[INFO] [stdout]    --> src/forest.rs:218:23
[INFO] [stdout]     |
[INFO] [stdout] 218 |         assert_eq!(5, forest.try_eval(v1).unwrap());
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/forest.rs:219:23
[INFO] [stdout]     |
[INFO] [stdout] 219 |         assert_eq!(9, forest.try_eval(v3).unwrap());
[INFO] [stdout]     |                       ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/forest.rs:223:24
[INFO] [stdout]     |
[INFO] [stdout] 223 |         assert_eq!(11, forest.try_eval(v0).unwrap());
[INFO] [stdout]     |                        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/forest.rs:224:24
[INFO] [stdout]     |
[INFO] [stdout] 224 |         assert_eq!(14, forest.try_eval(v1).unwrap());
[INFO] [stdout]     |                        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `elu` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `elu` (lib test) due to 5 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "ac6eb20749bc94605ab4f5248ab5ff0aac1c0f7f4597bdaefeec75fb9c7b269a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac6eb20749bc94605ab4f5248ab5ff0aac1c0f7f4597bdaefeec75fb9c7b269a", kill_on_drop: false }`
[INFO] [stdout] ac6eb20749bc94605ab4f5248ab5ff0aac1c0f7f4597bdaefeec75fb9c7b269a
