[INFO] cloning repository https://github.com/Muttsuri/PNGme
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Muttsuri/PNGme" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMuttsuri%2FPNGme", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMuttsuri%2FPNGme'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 25b739000286b8370791e5a02eb64ef7dd1ade9b
[INFO] checking Muttsuri/PNGme against master#8007b506ac5da629f223b755f5a5391edd5f6d01 for pr-88041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMuttsuri%2FPNGme" "/workspace/builds/worker-75/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-75/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Muttsuri/PNGme on toolchain 8007b506ac5da629f223b755f5a5391edd5f6d01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Muttsuri/PNGme
[INFO] finished tweaking git repo https://github.com/Muttsuri/PNGme
[INFO] tweaked toml for git repo https://github.com/Muttsuri/PNGme written to /workspace/builds/worker-75/source/Cargo.toml
[INFO] crate git repo https://github.com/Muttsuri/PNGme already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2afdcdcaa27657fec11bb098922de75e6eb4f94a69eaf5963dd0ed481b523b19
[INFO] running `Command { std: "docker" "start" "-a" "2afdcdcaa27657fec11bb098922de75e6eb4f94a69eaf5963dd0ed481b523b19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2afdcdcaa27657fec11bb098922de75e6eb4f94a69eaf5963dd0ed481b523b19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2afdcdcaa27657fec11bb098922de75e6eb4f94a69eaf5963dd0ed481b523b19", kill_on_drop: false }`
[INFO] [stdout] 2afdcdcaa27657fec11bb098922de75e6eb4f94a69eaf5963dd0ed481b523b19
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 659dc9db4ad1ce99e614c3a58a8b754657bf50fba2f463d3e7c05a648f00476f
[INFO] running `Command { std: "docker" "start" "-a" "659dc9db4ad1ce99e614c3a58a8b754657bf50fba2f463d3e7c05a648f00476f", kill_on_drop: false }`
[INFO] [stderr]     Checking png_me v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type alias is never used: `Err`
[INFO] [stdout]   --> src/chunk_type.rs:36:13
[INFO] [stdout]    |
[INFO] [stdout] 36 |             type Err = &'static str;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `bytes`
[INFO] [stdout]   --> src/chunk_type.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 44 |         fn bytes(&self) -> [u8; 4] {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_critical`
[INFO] [stdout]   --> src/chunk_type.rs:50:12
[INFO] [stdout]    |
[INFO] [stdout] 50 |         fn is_critical(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_public`
[INFO] [stdout]   --> src/chunk_type.rs:53:12
[INFO] [stdout]    |
[INFO] [stdout] 53 |         fn is_public(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_reserved_bit_valid`
[INFO] [stdout]   --> src/chunk_type.rs:56:12
[INFO] [stdout]    |
[INFO] [stdout] 56 |         fn is_reserved_bit_valid(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_safe_to_copy`
[INFO] [stdout]   --> src/chunk_type.rs:59:12
[INFO] [stdout]    |
[INFO] [stdout] 59 |         fn is_safe_to_copy(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_string`
[INFO] [stdout]   --> src/chunk_type.rs:62:12
[INFO] [stdout]    |
[INFO] [stdout] 62 |         fn to_string(&self) -> String {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `chunk_type::chunk_type::ChunkType` doesn't implement `Debug`
[INFO] [stdout]   --> src/chunk_type.rs:86:13
[INFO] [stdout]    |
[INFO] [stdout] 86 |             assert_eq!(expected, actual);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `chunk_type::chunk_type::ChunkType` cannot be formatted using `{:?}`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `Debug` is not implemented for `chunk_type::chunk_type::ChunkType`
[INFO] [stdout]    = note: add `#[derive(Debug)]` to `chunk_type::chunk_type::ChunkType` or manually `impl Debug for chunk_type::chunk_type::ChunkType`
[INFO] [stdout]    = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `chunk_type::chunk_type::ChunkType` doesn't implement `std::fmt::Display`
[INFO] [stdout]    --> src/chunk_type.rs:162:47
[INFO] [stdout]     |
[INFO] [stdout] 162 |             let _chunk_string = format!("{}", chunk_type_1);
[INFO] [stdout]     |                                               ^^^^^^^^^^^^ `chunk_type::chunk_type::ChunkType` cannot be formatted with the default formatter
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `std::fmt::Display` is not implemented for `chunk_type::chunk_type::ChunkType`
[INFO] [stdout]     = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
[INFO] [stdout]     = note: this error originates in the macro `$crate::__export::format_args` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `png_me` due to 3 previous errors
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "659dc9db4ad1ce99e614c3a58a8b754657bf50fba2f463d3e7c05a648f00476f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "659dc9db4ad1ce99e614c3a58a8b754657bf50fba2f463d3e7c05a648f00476f", kill_on_drop: false }`
[INFO] [stdout] 659dc9db4ad1ce99e614c3a58a8b754657bf50fba2f463d3e7c05a648f00476f