[INFO] updating cached repository boustrophedon/png-concealer
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/boustrophedon/png-concealer
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/boustrophedon/png-concealer" "work/ex/beta-1.38-1/sources/1.37.0/gh/boustrophedon/png-concealer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/boustrophedon/png-concealer'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/boustrophedon/png-concealer" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/boustrophedon/png-concealer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/boustrophedon/png-concealer'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3cf6cb856894fe5c0b47e76cd18ab52c235be237
[INFO] sha for GitHub repo boustrophedon/png-concealer: 3cf6cb856894fe5c0b47e76cd18ab52c235be237
[INFO] validating manifest of boustrophedon/png-concealer on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of boustrophedon/png-concealer on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing boustrophedon/png-concealer
[INFO] finished frobbing boustrophedon/png-concealer
[INFO] frobbed toml for boustrophedon/png-concealer written to work/ex/beta-1.38-1/sources/1.37.0/gh/boustrophedon/png-concealer/Cargo.toml
[INFO] started frobbing boustrophedon/png-concealer
[INFO] finished frobbing boustrophedon/png-concealer
[INFO] frobbed toml for boustrophedon/png-concealer written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/boustrophedon/png-concealer/Cargo.toml
[INFO] crate boustrophedon/png-concealer already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing boustrophedon/png-concealer against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/boustrophedon/png-concealer:/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=warn" "-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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] d4eb665daf1b14fd073dedf78af7ac7df8fc438e15ba850f771c50cf733d821f
[INFO] running `"docker" "start" "-a" "d4eb665daf1b14fd073dedf78af7ac7df8fc438e15ba850f771c50cf733d821f"`
[INFO] [stderr]    Compiling syn v0.13.10
[INFO] [stderr]    Compiling structopt-derive v0.2.8
[INFO] [stderr]    Compiling structopt v0.2.8
[INFO] [stderr]    Compiling png-concealer v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `input_png`
[INFO] [stderr]    --> src/main.rs:109:16
[INFO] [stderr]     |
[INFO] [stderr] 109 | fn decode_file(input_png: PathBuf, output: PathBuf) {
[INFO] [stderr]     |                ^^^^^^^^^ help: consider prefixing with an underscore: `_input_png`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `output`
[INFO] [stderr]    --> src/main.rs:109:36
[INFO] [stderr]     |
[INFO] [stderr] 109 | fn decode_file(input_png: PathBuf, output: PathBuf) {
[INFO] [stderr]     |                                    ^^^^^^ help: consider prefixing with an underscore: `_output`
[INFO] [stderr] 
[INFO] [stderr] warning: constant `max_length` should have an upper case name
[INFO] [stderr]   --> src/main.rs:51:11
[INFO] [stderr]    |
[INFO] [stderr] 51 |     const max_length: usize = (1<<31) - 1; // as defined in png spec
[INFO] [stderr]    |           ^^^^^^^^^^ help: convert the identifier to upper case: `MAX_LENGTH`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.56s
[INFO] running `"docker" "inspect" "d4eb665daf1b14fd073dedf78af7ac7df8fc438e15ba850f771c50cf733d821f"`
[INFO] running `"docker" "rm" "-f" "d4eb665daf1b14fd073dedf78af7ac7df8fc438e15ba850f771c50cf733d821f"`
[INFO] [stdout] d4eb665daf1b14fd073dedf78af7ac7df8fc438e15ba850f771c50cf733d821f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/boustrophedon/png-concealer:/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 8bab1be0e09c097c904e1d8f77e0204657b92cc5ab86a8d86ef3c23a0b12f77d
[INFO] running `"docker" "start" "-a" "8bab1be0e09c097c904e1d8f77e0204657b92cc5ab86a8d86ef3c23a0b12f77d"`
[INFO] [stderr]    Compiling png-concealer v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `input_png`
[INFO] [stderr]    --> src/main.rs:109:16
[INFO] [stderr]     |
[INFO] [stderr] 109 | fn decode_file(input_png: PathBuf, output: PathBuf) {
[INFO] [stderr]     |                ^^^^^^^^^ help: consider prefixing with an underscore: `_input_png`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `output`
[INFO] [stderr]    --> src/main.rs:109:36
[INFO] [stderr]     |
[INFO] [stderr] 109 | fn decode_file(input_png: PathBuf, output: PathBuf) {
[INFO] [stderr]     |                                    ^^^^^^ help: consider prefixing with an underscore: `_output`
[INFO] [stderr] 
[INFO] [stderr] warning: constant `max_length` should have an upper case name
[INFO] [stderr]   --> src/main.rs:51:11
[INFO] [stderr]    |
[INFO] [stderr] 51 |     const max_length: usize = (1<<31) - 1; // as defined in png spec
[INFO] [stderr]    |           ^^^^^^^^^^ help: convert the identifier to upper case: `MAX_LENGTH`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.12s
[INFO] running `"docker" "inspect" "8bab1be0e09c097c904e1d8f77e0204657b92cc5ab86a8d86ef3c23a0b12f77d"`
[INFO] running `"docker" "rm" "-f" "8bab1be0e09c097c904e1d8f77e0204657b92cc5ab86a8d86ef3c23a0b12f77d"`
[INFO] [stdout] 8bab1be0e09c097c904e1d8f77e0204657b92cc5ab86a8d86ef3c23a0b12f77d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/boustrophedon/png-concealer:/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 0e15187a78f48d1aa9b9e3e9e4fd1189b752b9ee858610f0fd45aa29d50de01b
[INFO] running `"docker" "start" "-a" "0e15187a78f48d1aa9b9e3e9e4fd1189b752b9ee858610f0fd45aa29d50de01b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.08s
[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
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/png_concealer-7cac00c8d596babf
[INFO] running `"docker" "inspect" "0e15187a78f48d1aa9b9e3e9e4fd1189b752b9ee858610f0fd45aa29d50de01b"`
[INFO] running `"docker" "rm" "-f" "0e15187a78f48d1aa9b9e3e9e4fd1189b752b9ee858610f0fd45aa29d50de01b"`
[INFO] [stdout] 0e15187a78f48d1aa9b9e3e9e4fd1189b752b9ee858610f0fd45aa29d50de01b