[INFO] fetching crate backtrack 0.3.0...
[INFO] testing backtrack-0.3.0 against try#c2e32f1c9652b13ed99608599c1e855462f421f3 for pr-146098-7
[INFO] extracting crate backtrack 0.3.0 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate backtrack 0.3.0
[INFO] finished tweaking crates.io crate backtrack 0.3.0
[INFO] tweaked toml for crates.io crate backtrack 0.3.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate backtrack 0.3.0 on toolchain c2e32f1c9652b13ed99608599c1e855462f421f3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate backtrack 0.3.0 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" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c3946886d1f2326f052f98f7887a7923d28f0f129d2f33dcae39b7f92e32210b
[INFO] running `Command { std: "docker" "start" "-a" "c3946886d1f2326f052f98f7887a7923d28f0f129d2f33dcae39b7f92e32210b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c3946886d1f2326f052f98f7887a7923d28f0f129d2f33dcae39b7f92e32210b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3946886d1f2326f052f98f7887a7923d28f0f129d2f33dcae39b7f92e32210b", kill_on_drop: false }`
[INFO] [stdout] c3946886d1f2326f052f98f7887a7923d28f0f129d2f33dcae39b7f92e32210b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b6d6a30fe4d311754509ebe26992c8a1847aaff38ac5b0c240c9570572e0ddea
[INFO] running `Command { std: "docker" "start" "-a" "b6d6a30fe4d311754509ebe26992c8a1847aaff38ac5b0c240c9570572e0ddea", kill_on_drop: false }`
[INFO] [stderr]    Compiling backtrack v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.27s
[INFO] running `Command { std: "docker" "inspect" "b6d6a30fe4d311754509ebe26992c8a1847aaff38ac5b0c240c9570572e0ddea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6d6a30fe4d311754509ebe26992c8a1847aaff38ac5b0c240c9570572e0ddea", kill_on_drop: false }`
[INFO] [stdout] b6d6a30fe4d311754509ebe26992c8a1847aaff38ac5b0c240c9570572e0ddea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4268dc32a082c4820422419f390bb22327a0ce94a640a26cf19c3e52a82ced74
[INFO] running `Command { std: "docker" "start" "-a" "4268dc32a082c4820422419f390bb22327a0ce94a640a26cf19c3e52a82ced74", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling semver v1.0.3
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling itoa v0.4.7
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling regex-automata v0.1.10
[INFO] [stderr]    Compiling plotters-backend v0.3.2
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling half v1.7.1
[INFO] [stderr]    Compiling walkdir v2.3.2
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling itertools v0.10.1
[INFO] [stderr]    Compiling plotters-svg v0.3.1
[INFO] [stderr]    Compiling oorandom v11.1.3
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling crossbeam-channel v0.5.1
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling crossbeam-deque v0.8.0
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling plotters v0.3.1
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling criterion-plot v0.4.3
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling bstr v0.2.16
[INFO] [stderr]    Compiling serde_cbor v0.11.1
[INFO] [stderr]    Compiling csv v1.1.6
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling criterion v0.3.4
[INFO] [stderr]    Compiling backtrack v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 24.55s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: criterion v0.3.4
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "4268dc32a082c4820422419f390bb22327a0ce94a640a26cf19c3e52a82ced74", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4268dc32a082c4820422419f390bb22327a0ce94a640a26cf19c3e52a82ced74", kill_on_drop: false }`
[INFO] [stdout] 4268dc32a082c4820422419f390bb22327a0ce94a640a26cf19c3e52a82ced74
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c2e32f1c9652b13ed99608599c1e855462f421f3" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 1601a4a8935ae899a50fb8e2d1d83505d01fe1cabf51256baca58a3d7d468c2f
[INFO] running `Command { std: "docker" "start" "-a" "1601a4a8935ae899a50fb8e2d1d83505d01fe1cabf51256baca58a3d7d468c2f", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: criterion v0.3.4
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/backtrack-f45955a768c7a1dd)
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test problems::count_up::tests::count_up_sat ... ok
[INFO] [stdout] test problems::total_sum::tests::sums_sat3 ... ok
[INFO] [stdout] test problems::total_sum::tests::sums_sat4 ... ok
[INFO] [stdout] test problems::total_sum::tests::sums_unsat_too_few ... ok
[INFO] [stdout] test problems::count_up::tests::count_up_unsat ... ok
[INFO] [stdout] test problems::total_sum::tests::sums_unsat_too_many ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/it/main.rs (/opt/rustwide/target/debug/deps/it-e4d7ba50b533715a)
[INFO] [stdout] 
[INFO] [stdout] running 18 tests
[INFO] [stdout] test bit_queens::tiny_bit_at_least ... ok
[INFO] [stdout] test count_up::count_up_search_nosat ... ok
[INFO] [stdout] test count_up::total_sum_unsat_unique ... ok
[INFO] [stdout] test n_queens::four_queens_search_nodes ... ok
[INFO] [stdout] test n_queens::four_queens_unsat_unique ... ok
[INFO] [stdout] test count_up::count_up_search_sat ... ok
[INFO] [stdout] test n_queens::four_queens_search_sat ... ok
[INFO] [stdout] test total_sum::total_sum_unsat_unique ... ok
[INFO] [stdout] test total_sum::total_sum_unsat_unique_cached ... ok
[INFO] [stdout] test total_sum::total_sum_search_sat ... ok
[INFO] [stdout] test total_sum::total_sum_search_sat_cached ... ok
[INFO] [stdout] test zero_sized::zero_len_problem ... ok
[INFO] [stdout] test zero_sized::zero_len_problem_cached ... ok
[INFO] [stdout] test zero_sized::zero_sized_len_problem ... ok
[INFO] [stdout] test zero_sized::zero_sized_len_problem_cached ... ok
[INFO] [stdout] test zero_sized::zero_sized_problem ... ok
[INFO] [stdout] test zero_sized::zero_sized_problem_cached ... ok
[INFO] [stdout] test bit_queens::equivalent_n_queens ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 18 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.12s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests backtrack
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/lib.rs - (line 23) ... ok
[INFO] [stdout] test src/lib.rs - (line 61) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.43s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "1601a4a8935ae899a50fb8e2d1d83505d01fe1cabf51256baca58a3d7d468c2f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1601a4a8935ae899a50fb8e2d1d83505d01fe1cabf51256baca58a3d7d468c2f", kill_on_drop: false }`
[INFO] [stdout] 1601a4a8935ae899a50fb8e2d1d83505d01fe1cabf51256baca58a3d7d468c2f