[INFO] updating cached repository mvanniekerk/abelian_sandpile
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mvanniekerk/abelian_sandpile
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mvanniekerk/abelian_sandpile" "work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/mvanniekerk/abelian_sandpile"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/mvanniekerk/abelian_sandpile'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mvanniekerk/abelian_sandpile" "work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/mvanniekerk/abelian_sandpile"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/mvanniekerk/abelian_sandpile'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e5033ed65a67887d0dd766b72af4596c1b7cab47
[INFO] sha for GitHub repo mvanniekerk/abelian_sandpile: e5033ed65a67887d0dd766b72af4596c1b7cab47
[INFO] validating manifest of mvanniekerk/abelian_sandpile on toolchain master#e305df1846a6d985315917ae0c81b74af8b4e641
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mvanniekerk/abelian_sandpile on toolchain try#99a7498759a22b5684caf798a98b7e90ad9d2443
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mvanniekerk/abelian_sandpile
[INFO] finished frobbing mvanniekerk/abelian_sandpile
[INFO] frobbed toml for mvanniekerk/abelian_sandpile written to work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/mvanniekerk/abelian_sandpile/Cargo.toml
[INFO] started frobbing mvanniekerk/abelian_sandpile
[INFO] finished frobbing mvanniekerk/abelian_sandpile
[INFO] frobbed toml for mvanniekerk/abelian_sandpile written to work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/mvanniekerk/abelian_sandpile/Cargo.toml
[INFO] crate mvanniekerk/abelian_sandpile already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking mvanniekerk/abelian_sandpile against master#e305df1846a6d985315917ae0c81b74af8b4e641 for pr-60039-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039-1/worker-6/master#e305df1846a6d985315917ae0c81b74af8b4e641:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/mvanniekerk/abelian_sandpile:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] f3fd3e6fe923ba699008c4367a8b257cb83746efe399c8e65f9a3f9939b7e6b6
[INFO] running `"docker" "start" "-a" "f3fd3e6fe923ba699008c4367a8b257cb83746efe399c8e65f9a3f9939b7e6b6"`
[INFO] [stderr]    Compiling num-integer v0.1.38
[INFO] [stderr]    Compiling num-derive v0.2.2
[INFO] [stderr]     Checking num-iter v0.1.37
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking png v0.12.0
[INFO] [stderr]     Checking image v0.19.0
[INFO] [stderr]     Checking abelian_sandpile v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `print_map`
[INFO] [stderr]   --> src/main.rs:65:1
[INFO] [stderr]    |
[INFO] [stderr] 65 | fn print_map(map: &Map) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]    --> src/main.rs:107:1
[INFO] [stderr]     |
[INFO] [stderr] 107 | fn add(one: &Map, two: &Map) -> Map {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `negate`
[INFO] [stderr]    --> src/main.rs:117:1
[INFO] [stderr]     |
[INFO] [stderr] 117 | fn negate(mat: &Map) -> Map {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `subtract`
[INFO] [stderr]    --> src/main.rs:127:1
[INFO] [stderr]     |
[INFO] [stderr] 127 | fn subtract(one: &Map, two: &Map) -> Map {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `identity`
[INFO] [stderr]    --> src/main.rs:131:1
[INFO] [stderr]     |
[INFO] [stderr] 131 | fn identity() -> Map {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:157:5
[INFO] [stderr]     |
[INFO] [stderr] 157 |     create_dir_all(directory);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `print_map`
[INFO] [stderr]   --> src/main.rs:65:1
[INFO] [stderr]    |
[INFO] [stderr] 65 | fn print_map(map: &Map) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `add`
[INFO] [stderr]    --> src/main.rs:107:1
[INFO] [stderr]     |
[INFO] [stderr] 107 | fn add(one: &Map, two: &Map) -> Map {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `negate`
[INFO] [stderr]    --> src/main.rs:117:1
[INFO] [stderr]     |
[INFO] [stderr] 117 | fn negate(mat: &Map) -> Map {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `subtract`
[INFO] [stderr]    --> src/main.rs:127:1
[INFO] [stderr]     |
[INFO] [stderr] 127 | fn subtract(one: &Map, two: &Map) -> Map {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `identity`
[INFO] [stderr]    --> src/main.rs:131:1
[INFO] [stderr]     |
[INFO] [stderr] 131 | fn identity() -> Map {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:157:5
[INFO] [stderr]     |
[INFO] [stderr] 157 |     create_dir_all(directory);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.59s
[INFO] running `"docker" "inspect" "f3fd3e6fe923ba699008c4367a8b257cb83746efe399c8e65f9a3f9939b7e6b6"`
[INFO] running `"docker" "rm" "-f" "f3fd3e6fe923ba699008c4367a8b257cb83746efe399c8e65f9a3f9939b7e6b6"`
[INFO] [stdout] f3fd3e6fe923ba699008c4367a8b257cb83746efe399c8e65f9a3f9939b7e6b6