[INFO] cloning repository https://github.com/dralley/sudoku-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dralley/sudoku-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdralley%2Fsudoku-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdralley%2Fsudoku-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a89c12817a7b1a8c14875ba133f55fca3d7f536d
[INFO] checking dralley/sudoku-solver against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdralley%2Fsudoku-solver" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dralley/sudoku-solver 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 git repo https://github.com/dralley/sudoku-solver
[INFO] finished tweaking git repo https://github.com/dralley/sudoku-solver
[INFO] tweaked toml for git repo https://github.com/dralley/sudoku-solver written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/dralley/sudoku-solver 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded syn v0.15.43
[INFO] [stderr]   Downloaded log v0.4.7
[INFO] [stderr]   Downloaded regex-syntax v0.6.10
[INFO] [stderr]   Downloaded utf8-ranges v1.0.3
[INFO] [stderr]   Downloaded sudoku v0.7.0
[INFO] [stderr]   Downloaded regex v1.2.0
[INFO] [stderr]   Downloaded cc v1.0.38
[INFO] [stderr]   Downloaded backtrace v0.3.34
[INFO] [stderr]   Downloaded rustc-demangle v0.1.15
[INFO] [stderr]   Downloaded varisat-dimacs v0.2.1
[INFO] [stderr]   Downloaded vec_mut_scan v0.1.0
[INFO] [stderr]   Downloaded aho-corasick v0.7.4
[INFO] [stderr]   Downloaded varisat-formula v0.2.1
[INFO] [stderr]   Downloaded varisat-internal-proof v0.2.1
[INFO] [stderr]   Downloaded varisat-internal-macros v0.2.1
[INFO] [stderr]   Downloaded partial_ref_derive v0.3.1
[INFO] [stderr]   Downloaded partial_ref v0.3.1
[INFO] [stderr]   Downloaded varisat-checker v0.2.1
[INFO] [stderr]   Downloaded varisat v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] da470902610117a21abd1667951fd7a062529d37e7f5865db97cef477336cee8
[INFO] running `Command { std: "docker" "start" "-a" "da470902610117a21abd1667951fd7a062529d37e7f5865db97cef477336cee8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "da470902610117a21abd1667951fd7a062529d37e7f5865db97cef477336cee8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da470902610117a21abd1667951fd7a062529d37e7f5865db97cef477336cee8", kill_on_drop: false }`
[INFO] [stdout] da470902610117a21abd1667951fd7a062529d37e7f5865db97cef477336cee8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 2f5aca68c04882ce55de7a9ecab5a829c7dce8bec365f7372e71f8e1a1225316
[INFO] running `Command { std: "docker" "start" "-a" "2f5aca68c04882ce55de7a9ecab5a829c7dce8bec365f7372e71f8e1a1225316", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling syn v0.15.43
[INFO] [stderr]    Compiling cc v1.0.38
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking rustc-demangle v0.1.15
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]    Compiling autocfg v0.1.5
[INFO] [stderr]     Checking varisat-formula v0.2.1
[INFO] [stderr]    Compiling ucd-util v0.1.5
[INFO] [stderr]    Compiling lazy_static v1.3.0
[INFO] [stderr]    Compiling log v0.4.7
[INFO] [stderr]    Compiling serde v1.0.98
[INFO] [stderr]    Compiling utf8-ranges v1.0.3
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]     Checking rand_core v0.4.0
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]    Compiling regex-syntax v0.6.10
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]     Checking hashbrown v0.3.1
[INFO] [stderr]     Checking smallvec v0.6.10
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]     Checking vec_map v0.8.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking vec_mut_scan v0.1.0
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking leb128 v0.2.4
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling aho-corasick v0.7.4
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking ordered-float v1.0.2
[INFO] [stderr]    Compiling regex v1.2.0
[INFO] [stderr]     Checking sudoku v0.7.0
[INFO] [stderr]    Compiling backtrace v0.3.34
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling partial_ref_derive v0.3.1
[INFO] [stderr]    Compiling serde_derive v1.0.98
[INFO] [stderr]    Compiling varisat-internal-macros v0.2.1
[INFO] [stderr]     Checking partial_ref v0.3.1
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking varisat-internal-proof v0.2.1
[INFO] [stderr]     Checking varisat-dimacs v0.2.1
[INFO] [stderr]    Compiling varisat v0.2.1
[INFO] [stderr]     Checking varisat-checker v0.2.1
[INFO] [stderr]     Checking sudoku-solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `varisat` is imported redundantly
[INFO] [stdout]  --> src/lib.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use varisat;
[INFO] [stdout]   |     ^^^^^^^ the item `varisat` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `varisat` is imported redundantly
[INFO] [stdout]  --> src/lib.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use varisat;
[INFO] [stdout]   |     ^^^^^^^ the item `varisat` is already defined by prelude
[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: the item `sudoku` is imported redundantly
[INFO] [stdout]  --> tests/sudoku_solver.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use sudoku;
[INFO] [stdout]   |     ^^^^^^ the item `sudoku` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `sudoku_solver` is imported redundantly
[INFO] [stdout]  --> tests/sudoku_solver.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use sudoku_solver;
[INFO] [stdout]   |     ^^^^^^^^^^^^^ the item `sudoku_solver` is already defined by prelude
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings 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 17.56s
[INFO] running `Command { std: "docker" "inspect" "2f5aca68c04882ce55de7a9ecab5a829c7dce8bec365f7372e71f8e1a1225316", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f5aca68c04882ce55de7a9ecab5a829c7dce8bec365f7372e71f8e1a1225316", kill_on_drop: false }`
[INFO] [stdout] 2f5aca68c04882ce55de7a9ecab5a829c7dce8bec365f7372e71f8e1a1225316