[INFO] cloning repository https://github.com/drewwyatt/card-flipping
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/drewwyatt/card-flipping" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdrewwyatt%2Fcard-flipping", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdrewwyatt%2Fcard-flipping'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2269809d6924662b35097afb72a5f96a637a326c
[INFO] checking drewwyatt/card-flipping against master#91c0823ee63e793d990bb9fed898dc95b5d6db51 for pr-125741
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdrewwyatt%2Fcard-flipping" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/drewwyatt/card-flipping on toolchain 91c0823ee63e793d990bb9fed898dc95b5d6db51
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+91c0823ee63e793d990bb9fed898dc95b5d6db51" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/drewwyatt/card-flipping
[INFO] finished tweaking git repo https://github.com/drewwyatt/card-flipping
[INFO] tweaked toml for git repo https://github.com/drewwyatt/card-flipping written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/drewwyatt/card-flipping 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" "+91c0823ee63e793d990bb9fed898dc95b5d6db51" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking drewwyatt/card-flipping against try#0525276e4a85ae0a91f6f7447e501e2981e77908 for pr-125741
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdrewwyatt%2Fcard-flipping" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/drewwyatt/card-flipping on toolchain 0525276e4a85ae0a91f6f7447e501e2981e77908
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0525276e4a85ae0a91f6f7447e501e2981e77908" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/drewwyatt/card-flipping
[INFO] finished tweaking git repo https://github.com/drewwyatt/card-flipping
[INFO] tweaked toml for git repo https://github.com/drewwyatt/card-flipping written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/drewwyatt/card-flipping 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" "+0525276e4a85ae0a91f6f7447e501e2981e77908" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking drewwyatt/card-flipping against try#0525276e4a85ae0a91f6f7447e501e2981e77908 for pr-125741
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdrewwyatt%2Fcard-flipping" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/drewwyatt/card-flipping on toolchain 0525276e4a85ae0a91f6f7447e501e2981e77908
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0525276e4a85ae0a91f6f7447e501e2981e77908" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/drewwyatt/card-flipping
[INFO] finished tweaking git repo https://github.com/drewwyatt/card-flipping
[INFO] tweaked toml for git repo https://github.com/drewwyatt/card-flipping written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/drewwyatt/card-flipping 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" "+0525276e4a85ae0a91f6f7447e501e2981e77908" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+0525276e4a85ae0a91f6f7447e501e2981e77908" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2e51d2d240421f70951830ddcb188b41fd32fc08b3b6ca63572e10ef8972ced9
[INFO] running `Command { std: "docker" "start" "-a" "2e51d2d240421f70951830ddcb188b41fd32fc08b3b6ca63572e10ef8972ced9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2e51d2d240421f70951830ddcb188b41fd32fc08b3b6ca63572e10ef8972ced9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2e51d2d240421f70951830ddcb188b41fd32fc08b3b6ca63572e10ef8972ced9", kill_on_drop: false }`
[INFO] [stdout] 2e51d2d240421f70951830ddcb188b41fd32fc08b3b6ca63572e10ef8972ced9
[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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+0525276e4a85ae0a91f6f7447e501e2981e77908" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 74179f706ac31d96abf1ddce3ebddd05f65534539a68307e41021a444d65cae9
[INFO] running `Command { std: "docker" "start" "-a" "74179f706ac31d96abf1ddce3ebddd05f65534539a68307e41021a444d65cae9", kill_on_drop: false }`
[INFO] [stderr]     Checking card-flipping v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: found module declaration for lib.rs
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | mod lib;
[INFO] [stdout]   | ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: lib.rs is the root of this crate's library target
[INFO] [stdout]   = help: to refer to it from other targets, use the library's name as the path
[INFO] [stdout]   = note: `#[warn(special_module_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: found module declaration for lib.rs
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | mod lib;
[INFO] [stdout]   | ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: lib.rs is the root of this crate's library target
[INFO] [stdout]   = help: to refer to it from other targets, use the library's name as the path
[INFO] [stdout]   = note: `#[warn(special_module_name)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/lib/models.rs:26:17
[INFO] [stdout]    |
[INFO] [stdout] 26 |                 self.flip(self.cards.get(idx - 1));
[INFO] [stdout]    |                 ^^^^^----^----------^^^^^^^^^^^^^^
[INFO] [stdout]    |                 |    |    |
[INFO] [stdout]    |                 |    |    immutable borrow occurs here
[INFO] [stdout]    |                 |    immutable borrow later used by call
[INFO] [stdout]    |                 mutable borrow occurs here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/lib/models.rs:26:17
[INFO] [stdout]    |
[INFO] [stdout] 26 |                 self.flip(self.cards.get(idx - 1));
[INFO] [stdout]    |                 ^^^^^----^----------^^^^^^^^^^^^^^
[INFO] [stdout]    |                 |    |    |
[INFO] [stdout]    |                 |    |    immutable borrow occurs here
[INFO] [stdout]    |                 |    immutable borrow later used by call
[INFO] [stdout]    |                 mutable borrow occurs here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/lib/models.rs:27:17
[INFO] [stdout]    |
[INFO] [stdout] 27 |                 self.flip(self.cards.get(idx + 1));
[INFO] [stdout]    |                 ^^^^^----^----------^^^^^^^^^^^^^^
[INFO] [stdout]    |                 |    |    |
[INFO] [stdout]    |                 |    |    immutable borrow occurs here
[INFO] [stdout]    |                 |    immutable borrow later used by call
[INFO] [stdout]    |                 mutable borrow occurs here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/lib/models.rs:27:17
[INFO] [stdout]    |
[INFO] [stdout] 27 |                 self.flip(self.cards.get(idx + 1));
[INFO] [stdout]    |                 ^^^^^----^----------^^^^^^^^^^^^^^
[INFO] [stdout]    |                 |    |    |
[INFO] [stdout]    |                 |    |    immutable borrow occurs here
[INFO] [stdout]    |                 |    immutable borrow later used by call
[INFO] [stdout]    |                 mutable borrow occurs here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `card`
[INFO] [stdout]   --> src/lib/models.rs:36:24
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn flip(&mut self, card: Option<&Card>) {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_card`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `card`
[INFO] [stdout]   --> src/lib/models.rs:36:24
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn flip(&mut self, card: Option<&Card>) {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_card`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `card-flipping` (bin "card-flipping") due to 3 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `card-flipping` (bin "card-flipping" test) due to 3 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "74179f706ac31d96abf1ddce3ebddd05f65534539a68307e41021a444d65cae9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74179f706ac31d96abf1ddce3ebddd05f65534539a68307e41021a444d65cae9", kill_on_drop: false }`
[INFO] [stdout] 74179f706ac31d96abf1ddce3ebddd05f65534539a68307e41021a444d65cae9