[INFO] fetching crate ttools 0.1.2...
[INFO] checking ttools-0.1.2 against 1.95.0 for pr-155915
[INFO] extracting crate ttools 0.1.2 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate ttools 0.1.2
[INFO] finished tweaking crates.io crate ttools 0.1.2
[INFO] tweaked toml for crates.io crate ttools 0.1.2 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ttools 0.1.2 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate ttools 0.1.2 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2c8af38548a7196471f4c9a61dd29b5602826bafd84f793d948152076cbc85f2
[INFO] running `Command { std: "docker" "start" "-a" "2c8af38548a7196471f4c9a61dd29b5602826bafd84f793d948152076cbc85f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2c8af38548a7196471f4c9a61dd29b5602826bafd84f793d948152076cbc85f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c8af38548a7196471f4c9a61dd29b5602826bafd84f793d948152076cbc85f2", kill_on_drop: false }`
[INFO] [stdout] 2c8af38548a7196471f4c9a61dd29b5602826bafd84f793d948152076cbc85f2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b8a231062646b2cd34847042771f12ff681c325228d30ead0711e9a8dc5fd556
[INFO] running `Command { std: "docker" "start" "-a" "b8a231062646b2cd34847042771f12ff681c325228d30ead0711e9a8dc5fd556", kill_on_drop: false }`
[INFO] [stderr]    Compiling ttools v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:1:1
[INFO] [stdout]    |
[INFO] [stdout]  1 | / #![feature(
[INFO] [stdout]  2 | |     lazy_type_alias,
[INFO] [stdout]  3 | |     try_trait_v2_residual,
[INFO] [stdout]  4 | |     try_trait_v2,
[INFO] [stdout] ...  |
[INFO] [stdout]  9 | |     iter_next_chunk
[INFO] [stdout] 10 | | )]
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:1:1
[INFO] [stdout]    |
[INFO] [stdout]  1 | / #![feature(
[INFO] [stdout]  2 | |     lazy_type_alias,
[INFO] [stdout]  3 | |     try_trait_v2_residual,
[INFO] [stdout]  4 | |     try_trait_v2,
[INFO] [stdout] ...  |
[INFO] [stdout]  9 | |     iter_next_chunk
[INFO] [stdout] 10 | | )]
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/iterator.rs:248:9
[INFO] [stdout]     |
[INFO] [stdout] 248 |     let x = [(1, 2), (3, 4)].iter().map_at::<0>(|x| x + 2);
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/iterator.rs:249:9
[INFO] [stdout]     |
[INFO] [stdout] 249 |     let y = [(1, "a"), (2, "b")]
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/try.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let x = x.on::<1>();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/try.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let x = x.as_mut().on::<1>();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/try.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |     let x = (&Ok::<_, ()>((Y, Y))).as_ref().on::<1>();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ttools` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ttools` (lib test) due to 1 previous error; 5 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "b8a231062646b2cd34847042771f12ff681c325228d30ead0711e9a8dc5fd556", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8a231062646b2cd34847042771f12ff681c325228d30ead0711e9a8dc5fd556", kill_on_drop: false }`
[INFO] [stdout] b8a231062646b2cd34847042771f12ff681c325228d30ead0711e9a8dc5fd556
