[INFO] fetching crate lelwel 0.4.2...
[INFO] checking lelwel-0.4.2 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate lelwel 0.4.2 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate lelwel 0.4.2 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lelwel 0.4.2
[INFO] finished tweaking crates.io crate lelwel 0.4.2
[INFO] tweaked toml for crates.io crate lelwel 0.4.2 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate lelwel 0.4.2 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded lsp-types v0.91.1
[INFO] [stderr]   Downloaded crossbeam-utils v0.8.6
[INFO] [stderr]   Downloaded os_str_bytes v6.0.0
[INFO] [stderr]   Downloaded lsp-server v0.5.2
[INFO] [stderr]   Downloaded serde_repr v0.1.7
[INFO] [stderr]   Downloaded clap v3.0.7
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 663e39ec54d63ec0050f12faa56e15eb7ab9b7578b8dbd66b1de7d4eaa5c986c
[INFO] running `Command { std: "docker" "start" "-a" "663e39ec54d63ec0050f12faa56e15eb7ab9b7578b8dbd66b1de7d4eaa5c986c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "663e39ec54d63ec0050f12faa56e15eb7ab9b7578b8dbd66b1de7d4eaa5c986c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "663e39ec54d63ec0050f12faa56e15eb7ab9b7578b8dbd66b1de7d4eaa5c986c", kill_on_drop: false }`
[INFO] [stdout] 663e39ec54d63ec0050f12faa56e15eb7ab9b7578b8dbd66b1de7d4eaa5c986c
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] af6cee623505115e81b03b65d2e4432886d4c4a982b34907c383cd2dfc3b20d1
[INFO] running `Command { std: "docker" "start" "-a" "af6cee623505115e81b03b65d2e4432886d4c4a982b34907c383cd2dfc3b20d1", kill_on_drop: false }`
[INFO] [stderr]     Checking bumpalo v3.9.1
[INFO] [stderr]     Checking lelwel v0.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Bump` is imported redundantly
[INFO] [stdout]  --> src/frontend/ast/imp.rs:3:53
[INFO] [stdout]   |
[INFO] [stdout] 2 | use super::*;
[INFO] [stdout]   |     -------- the item `Bump` is already imported here
[INFO] [stdout] 3 | use bumpalo::{boxed::Box, collections::Vec as BVec, Bump};
[INFO] [stdout]   |                                                     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Bump` is imported redundantly
[INFO] [stdout]  --> src/frontend/ast/imp.rs:3:53
[INFO] [stdout]   |
[INFO] [stdout] 2 | use super::*;
[INFO] [stdout]   |     -------- the item `Bump` is already imported here
[INFO] [stdout] 3 | use bumpalo::{boxed::Box, collections::Vec as BVec, Bump};
[INFO] [stdout]   |                                                     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.38s
[INFO] running `Command { std: "docker" "inspect" "af6cee623505115e81b03b65d2e4432886d4c4a982b34907c383cd2dfc3b20d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af6cee623505115e81b03b65d2e4432886d4c4a982b34907c383cd2dfc3b20d1", kill_on_drop: false }`
[INFO] [stdout] af6cee623505115e81b03b65d2e4432886d4c4a982b34907c383cd2dfc3b20d1
[INFO] checking lelwel-0.4.2 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate lelwel 0.4.2 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate lelwel 0.4.2 on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lelwel 0.4.2
[INFO] finished tweaking crates.io crate lelwel 0.4.2
[INFO] tweaked toml for crates.io crate lelwel 0.4.2 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate lelwel 0.4.2 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 641ecd9909f029902ee3fb7f3d613f14313cb7241f2c0c3e0fcadcc16419bbd3
[INFO] running `Command { std: "docker" "start" "-a" "641ecd9909f029902ee3fb7f3d613f14313cb7241f2c0c3e0fcadcc16419bbd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "641ecd9909f029902ee3fb7f3d613f14313cb7241f2c0c3e0fcadcc16419bbd3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "641ecd9909f029902ee3fb7f3d613f14313cb7241f2c0c3e0fcadcc16419bbd3", kill_on_drop: false }`
[INFO] [stdout] 641ecd9909f029902ee3fb7f3d613f14313cb7241f2c0c3e0fcadcc16419bbd3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fbf52dad1bb92e3f4f2a9997bf610d16147e913c2fcb3a2e086bd4c9b713ab9f
[INFO] running `Command { std: "docker" "start" "-a" "fbf52dad1bb92e3f4f2a9997bf610d16147e913c2fcb3a2e086bd4c9b713ab9f", kill_on_drop: false }`
[INFO] [stderr]     Checking bumpalo v3.9.1
[INFO] [stderr]     Checking lelwel v0.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Bump` is imported redundantly
[INFO] [stdout]  --> src/frontend/ast/imp.rs:3:53
[INFO] [stdout]   |
[INFO] [stdout] 2 | use super::*;
[INFO] [stdout]   |     -------- the item `Bump` is already imported here
[INFO] [stdout] 3 | use bumpalo::{boxed::Box, collections::Vec as BVec, Bump};
[INFO] [stdout]   |                                                     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Bump` is imported redundantly
[INFO] [stdout]  --> src/frontend/ast/imp.rs:3:53
[INFO] [stdout]   |
[INFO] [stdout] 2 | use super::*;
[INFO] [stdout]   |     -------- the item `Bump` is already imported here
[INFO] [stdout] 3 | use bumpalo::{boxed::Box, collections::Vec as BVec, Bump};
[INFO] [stdout]   |                                                     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.10s
[INFO] running `Command { std: "docker" "inspect" "fbf52dad1bb92e3f4f2a9997bf610d16147e913c2fcb3a2e086bd4c9b713ab9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fbf52dad1bb92e3f4f2a9997bf610d16147e913c2fcb3a2e086bd4c9b713ab9f", kill_on_drop: false }`
[INFO] [stdout] fbf52dad1bb92e3f4f2a9997bf610d16147e913c2fcb3a2e086bd4c9b713ab9f