[INFO] fetching crate flat_collections 0.2.0...
[INFO] testing flat_collections-0.2.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate flat_collections 0.2.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate flat_collections 0.2.0
[INFO] finished tweaking crates.io crate flat_collections 0.2.0
[INFO] tweaked toml for crates.io crate flat_collections 0.2.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate flat_collections 0.2.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "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" "+1.90.0" "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" "+1.90.0" "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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8142e025630ddc82824d5021086acc24511d43dccdf4096977cd304a8b5cd695
[INFO] running `Command { std: "docker" "start" "-a" "8142e025630ddc82824d5021086acc24511d43dccdf4096977cd304a8b5cd695", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8142e025630ddc82824d5021086acc24511d43dccdf4096977cd304a8b5cd695", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8142e025630ddc82824d5021086acc24511d43dccdf4096977cd304a8b5cd695", kill_on_drop: false }`
[INFO] [stdout] 8142e025630ddc82824d5021086acc24511d43dccdf4096977cd304a8b5cd695
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f1184cbd5cee8948c7fe3a2623e628257cde5f752ff84bb6e708ee204d80a336
[INFO] running `Command { std: "docker" "start" "-a" "f1184cbd5cee8948c7fe3a2623e628257cde5f752ff84bb6e708ee204d80a336", kill_on_drop: false }`
[INFO] [stderr]    Compiling flat_collections v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.35s
[INFO] running `Command { std: "docker" "inspect" "f1184cbd5cee8948c7fe3a2623e628257cde5f752ff84bb6e708ee204d80a336", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1184cbd5cee8948c7fe3a2623e628257cde5f752ff84bb6e708ee204d80a336", kill_on_drop: false }`
[INFO] [stdout] f1184cbd5cee8948c7fe3a2623e628257cde5f752ff84bb6e708ee204d80a336
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 257c0c888a8e70d43acfefb2e2871ca06512f8641d9c2b77476db3286ed5ebeb
[INFO] running `Command { std: "docker" "start" "-a" "257c0c888a8e70d43acfefb2e2871ca06512f8641d9c2b77476db3286ed5ebeb", kill_on_drop: false }`
[INFO] [stderr]    Compiling flat_collections v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/flat_set.rs:86:13
[INFO] [stdout]    |
[INFO] [stdout] 86 |         let mut m = FlatSet::from([1, 2, 3]);
[INFO] [stdout]    |             ----^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.66s
[INFO] running `Command { std: "docker" "inspect" "257c0c888a8e70d43acfefb2e2871ca06512f8641d9c2b77476db3286ed5ebeb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "257c0c888a8e70d43acfefb2e2871ca06512f8641d9c2b77476db3286ed5ebeb", kill_on_drop: false }`
[INFO] [stdout] 257c0c888a8e70d43acfefb2e2871ca06512f8641d9c2b77476db3286ed5ebeb
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] b7aee0430debcc74780585c9f620cbe65c4880ae25f6181bb5ab084772b3e1b1
[INFO] running `Command { std: "docker" "start" "-a" "b7aee0430debcc74780585c9f620cbe65c4880ae25f6181bb5ab084772b3e1b1", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/flat_set.rs:86:13
[INFO] [stderr]    |
[INFO] [stderr] 86 |         let mut m = FlatSet::from([1, 2, 3]);
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `flat_collections` (lib test) generated 1 warning (run `cargo fix --lib -p flat_collections --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/flat_collections-2143db56e3cf8b0c)
[INFO] [stdout] 
[INFO] [stdout] running 20 tests
[INFO] [stdout] test flat_map::tests::test_contains_key ... ok
[INFO] [stdout] test flat_map::tests::test_clear ... ok
[INFO] [stdout] test flat_map::tests::test_get ... ok
[INFO] [stdout] test flat_map::tests::test_get_mut ... ok
[INFO] [stdout] test flat_map::tests::test_get_key_value ... ok
[INFO] [stdout] test flat_map::tests::test_iter ... ok
[INFO] [stdout] test flat_map::tests::test_insert ... ok
[INFO] [stdout] test flat_map::tests::test_remove ... ok
[INFO] [stdout] test flat_map::tests::test_values ... ok
[INFO] [stdout] test flat_map::tests::test_values_mut ... ok
[INFO] [stdout] test flat_set::tests::test_insert ... ok
[INFO] [stdout] test flat_set::tests::test_is_empty ... ok
[INFO] [stdout] test flat_map::tests::test_iter_mut ... ok
[INFO] [stdout] test flat_set::tests::test_remove ... ok
[INFO] [stdout] test flat_map::tests::test_range ... ok
[INFO] [stdout] test flat_set::tests::test_contains ... ok
[INFO] [stdout] test flat_set::tests::test_iter ... ok
[INFO] [stdout] test flat_map::tests::test_keys ... ok
[INFO] [stdout] test flat_set::tests::test_len ... ok
[INFO] [stdout] test flat_map::tests::test_len ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.06s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests flat_collections
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b7aee0430debcc74780585c9f620cbe65c4880ae25f6181bb5ab084772b3e1b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7aee0430debcc74780585c9f620cbe65c4880ae25f6181bb5ab084772b3e1b1", kill_on_drop: false }`
[INFO] [stdout] b7aee0430debcc74780585c9f620cbe65c4880ae25f6181bb5ab084772b3e1b1