Dec 18 03:05:16.649 INFO checking boustrophedon/png-concealer against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 03:05:16.649 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-1/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/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=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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 03:05:17.182 INFO [stdout] 89a9d53d161df0a4e2fffca8d53422013ee82f80f38145f273dc5c950ff4c080
Dec 18 03:05:17.190 INFO running `"docker" "start" "-a" "89a9d53d161df0a4e2fffca8d53422013ee82f80f38145f273dc5c950ff4c080"`
Dec 18 03:05:19.544 INFO [stderr]     Checking strsim v0.7.0
Dec 18 03:05:19.544 INFO [stderr]     Checking vec_map v0.8.1
Dec 18 03:05:19.552 INFO [stderr]     Checking bitflags v1.0.3
Dec 18 03:05:19.552 INFO [stderr]     Checking ansi_term v0.11.0
Dec 18 03:05:19.600 INFO [stderr]     Checking byteorder v1.2.3
Dec 18 03:05:19.624 INFO [stderr]    Compiling proc-macro2 v0.3.8
Dec 18 03:05:21.136 INFO [stderr]     Checking clap v2.31.2
Dec 18 03:05:22.202 INFO [stderr]     Checking base64 v0.9.1
Dec 18 03:05:24.940 INFO [stderr]    Compiling quote v0.5.2
Dec 18 03:05:25.622 INFO [stderr]    Compiling syn v0.13.10
Dec 18 03:05:34.866 INFO [stderr]    Compiling structopt-derive v0.2.8
Dec 18 03:05:37.797 INFO [stderr]     Checking structopt v0.2.8
Dec 18 03:05:38.198 INFO [stderr]     Checking png-concealer v0.1.0 (/opt/crater/workdir)
Dec 18 03:05:38.832 INFO [stderr] warning: unused `#[macro_use]` import
Dec 18 03:05:38.832 INFO [stderr]  --> src/main.rs:5:1
Dec 18 03:05:38.832 INFO [stderr]   |
Dec 18 03:05:38.832 INFO [stderr] 5 | #[macro_use]
Dec 18 03:05:38.832 INFO [stderr]   | ^^^^^^^^^^^^
Dec 18 03:05:38.832 INFO [stderr]   |
Dec 18 03:05:38.832 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 03:05:38.832 INFO [stderr] 
Dec 18 03:05:38.895 INFO [stderr] warning: unused `#[macro_use]` import
Dec 18 03:05:38.895 INFO [stderr]  --> src/main.rs:5:1
Dec 18 03:05:38.895 INFO [stderr]   |
Dec 18 03:05:38.895 INFO [stderr] 5 | #[macro_use]
Dec 18 03:05:38.895 INFO [stderr]   | ^^^^^^^^^^^^
Dec 18 03:05:38.895 INFO [stderr]   |
Dec 18 03:05:38.895 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 03:05:38.895 INFO [stderr] 
Dec 18 03:05:38.980 INFO [stderr] warning: unused variable: `input_png`
Dec 18 03:05:38.984 INFO [stderr]    --> src/main.rs:109:16
Dec 18 03:05:38.984 INFO [stderr]     |
Dec 18 03:05:38.984 INFO [stderr] 109 | fn decode_file(input_png: PathBuf, output: PathBuf) {
Dec 18 03:05:38.984 INFO [stderr]     |                ^^^^^^^^^ help: consider using `_input_png` instead
Dec 18 03:05:38.988 INFO [stderr]     |
Dec 18 03:05:38.988 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 18 03:05:38.988 INFO [stderr] 
Dec 18 03:05:38.988 INFO [stderr] warning: unused variable: `output`
Dec 18 03:05:38.988 INFO [stderr]    --> src/main.rs:109:36
Dec 18 03:05:38.988 INFO [stderr]     |
Dec 18 03:05:38.988 INFO [stderr] 109 | fn decode_file(input_png: PathBuf, output: PathBuf) {
Dec 18 03:05:38.988 INFO [stderr]     |                                    ^^^^^^ help: consider using `_output` instead
Dec 18 03:05:38.988 INFO [stderr] 
Dec 18 03:05:39.052 INFO [stderr] warning: constant `max_length` should have an upper case name such as `MAX_LENGTH`
Dec 18 03:05:39.052 INFO [stderr]   --> src/main.rs:51:5
Dec 18 03:05:39.052 INFO [stderr]    |
Dec 18 03:05:39.052 INFO [stderr] 51 |     const max_length: usize = (1<<31) - 1; // as defined in png spec
Dec 18 03:05:39.052 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:05:39.060 INFO [stderr]    |
Dec 18 03:05:39.060 INFO [stderr]    = note: #[warn(non_upper_case_globals)] on by default
Dec 18 03:05:39.060 INFO [stderr] 
Dec 18 03:05:39.145 INFO [stderr] warning: unused variable: `input_png`
Dec 18 03:05:39.145 INFO [stderr]    --> src/main.rs:109:16
Dec 18 03:05:39.145 INFO [stderr]     |
Dec 18 03:05:39.145 INFO [stderr] 109 | fn decode_file(input_png: PathBuf, output: PathBuf) {
Dec 18 03:05:39.145 INFO [stderr]     |                ^^^^^^^^^ help: consider using `_input_png` instead
Dec 18 03:05:39.145 INFO [stderr]     |
Dec 18 03:05:39.145 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 18 03:05:39.145 INFO [stderr] 
Dec 18 03:05:39.145 INFO [stderr] warning: unused variable: `output`
Dec 18 03:05:39.145 INFO [stderr]    --> src/main.rs:109:36
Dec 18 03:05:39.145 INFO [stderr]     |
Dec 18 03:05:39.145 INFO [stderr] 109 | fn decode_file(input_png: PathBuf, output: PathBuf) {
Dec 18 03:05:39.145 INFO [stderr]     |                                    ^^^^^^ help: consider using `_output` instead
Dec 18 03:05:39.145 INFO [stderr] 
Dec 18 03:05:39.162 INFO [stderr] warning: constant `max_length` should have an upper case name such as `MAX_LENGTH`
Dec 18 03:05:39.162 INFO [stderr]   --> src/main.rs:51:5
Dec 18 03:05:39.163 INFO [stderr]    |
Dec 18 03:05:39.163 INFO [stderr] 51 |     const max_length: usize = (1<<31) - 1; // as defined in png spec
Dec 18 03:05:39.163 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:05:39.163 INFO [stderr]    |
Dec 18 03:05:39.163 INFO [stderr]    = note: #[warn(non_upper_case_globals)] on by default
Dec 18 03:05:39.163 INFO [stderr] 
Dec 18 03:05:39.200 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.78s
Dec 18 03:05:40.148 INFO running `"docker" "inspect" "89a9d53d161df0a4e2fffca8d53422013ee82f80f38145f273dc5c950ff4c080"`
Dec 18 03:05:40.490 INFO running `"docker" "rm" "-f" "89a9d53d161df0a4e2fffca8d53422013ee82f80f38145f273dc5c950ff4c080"`
Dec 18 03:05:40.804 INFO [stdout] 89a9d53d161df0a4e2fffca8d53422013ee82f80f38145f273dc5c950ff4c080