[INFO] fetching crate png_pong 0.8.2...
[INFO] testing png_pong-0.8.2 against beta-2023-04-20 for beta-1.70-1
[INFO] extracting crate png_pong 0.8.2 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate png_pong 0.8.2 on toolchain beta-2023-04-20
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate png_pong 0.8.2
[INFO] finished tweaking crates.io crate png_pong 0.8.2
[INFO] tweaked toml for crates.io crate png_pong 0.8.2 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate crates.io crate png_pong 0.8.2 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" "+beta-2023-04-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pix v0.13.1
[INFO] [stderr]   Downloaded crossbeam-epoch v0.9.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fa2c998842c77a20574daf32ffc316d2d5c9662d51eaa31ba53c3e42e0ab10c1
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[INFO] running `Command { std: "docker" "inspect" "fa2c998842c77a20574daf32ffc316d2d5c9662d51eaa31ba53c3e42e0ab10c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa2c998842c77a20574daf32ffc316d2d5c9662d51eaa31ba53c3e42e0ab10c1", kill_on_drop: false }`
[INFO] [stdout] fa2c998842c77a20574daf32ffc316d2d5c9662d51eaa31ba53c3e42e0ab10c1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 62b02f4e98504329dce08929bc0a1cc926f4c2322fbf58718c05a3e77df62e43
[INFO] running `Command { std: "docker" "start" "-a" "62b02f4e98504329dce08929bc0a1cc926f4c2322fbf58718c05a3e77df62e43", kill_on_drop: false }`
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling pix v0.13.1
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling png_pong v0.8.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `text`, `langtag`, and `transkey` are never read
[INFO] [stdout]   --> src/decode/steps.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct TextEntry {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 28 |     text: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 29 |     langtag: Option<String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 30 |     transkey: Option<String>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TextEntry` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `has_decoded`, `is_animation`, and `idat_anim` are never read
[INFO] [stdout]   --> src/decode/steps.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | pub struct Steps<R: Read> {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 38 |     has_decoded: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |     is_animation: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 43 |     // Is IDAT part of the animation?
[INFO] [stdout] 44 |     idat_anim: bool,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Steps` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `coldepth` and `header` are never read
[INFO] [stdout]    --> src/encode/step_enc.rs:119:5
[INFO] [stdout]     |
[INFO] [stdout] 117 | pub struct StepEnc<W: Write> {
[INFO] [stdout]     |            ------- fields in this struct
[INFO] [stdout] 118 |     encoder: ChunkEnc<W>,
[INFO] [stdout] 119 |     coldepth: Option<(ColorType, u32)>,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 120 |     header: Option<ImageHeader>,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `StepEnc` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [optimized + debuginfo] target(s) in 2.70s
[INFO] running `Command { std: "docker" "inspect" "62b02f4e98504329dce08929bc0a1cc926f4c2322fbf58718c05a3e77df62e43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62b02f4e98504329dce08929bc0a1cc926f4c2322fbf58718c05a3e77df62e43", kill_on_drop: false }`
[INFO] [stdout] 62b02f4e98504329dce08929bc0a1cc926f4c2322fbf58718c05a3e77df62e43
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 12531693daafa89c28b17ffceb915331587d35b70a8fce32afa26b8385d33f42
[INFO] running `Command { std: "docker" "start" "-a" "12531693daafa89c28b17ffceb915331587d35b70a8fce32afa26b8385d33f42", kill_on_drop: false }`
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.4
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling memoffset v0.6.3
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.94
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling itoa v0.4.7
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling plotters-backend v0.3.0
[INFO] [stderr]    Compiling regex-automata v0.1.9
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling plotters-svg v0.3.0
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling same-file v1.0.6
[INFO] [stderr]    Compiling half v1.7.1
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling walkdir v2.3.2
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling itertools v0.10.0
[INFO] [stderr]    Compiling oorandom v11.1.3
[INFO] [stderr]    Compiling semver-parser v0.10.2
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling semver v0.11.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.4
[INFO] [stderr]    Compiling crossbeam-channel v0.5.1
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling rustc_version v0.3.3
[INFO] [stderr]    Compiling crossbeam-deque v0.8.0
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling plotters v0.3.0
[INFO] [stderr]    Compiling cast v0.2.6
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stdout] warning: fields `text`, `langtag`, and `transkey` are never read
[INFO] [stdout]   --> src/decode/steps.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct TextEntry {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 28 |     text: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 29 |     langtag: Option<String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 30 |     transkey: Option<String>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TextEntry` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `has_decoded`, `is_animation`, and `idat_anim` are never read
[INFO] [stdout]   --> src/decode/steps.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | pub struct Steps<R: Read> {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 38 |     has_decoded: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |     is_animation: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 43 |     // Is IDAT part of the animation?
[INFO] [stdout] 44 |     idat_anim: bool,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Steps` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `coldepth` and `header` are never read
[INFO] [stdout]    --> src/encode/step_enc.rs:119:5
[INFO] [stdout]     |
[INFO] [stdout] 117 | pub struct StepEnc<W: Write> {
[INFO] [stdout]     |            ------- fields in this struct
[INFO] [stdout] 118 |     encoder: ChunkEnc<W>,
[INFO] [stdout] 119 |     coldepth: Option<(ColorType, u32)>,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 120 |     header: Option<ImageHeader>,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `StepEnc` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling criterion-plot v0.4.3
[INFO] [stderr]    Compiling bstr v0.2.16
[INFO] [stderr]    Compiling serde_cbor v0.11.1
[INFO] [stderr]    Compiling csv v1.1.6
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling criterion v0.3.4
[INFO] [stderr]    Compiling png_pong v0.8.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `text`, `langtag`, and `transkey` are never read
[INFO] [stdout]   --> src/decode/steps.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | struct TextEntry {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 28 |     text: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 29 |     langtag: Option<String>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 30 |     transkey: Option<String>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `TextEntry` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `has_decoded`, `is_animation`, and `idat_anim` are never read
[INFO] [stdout]   --> src/decode/steps.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | pub struct Steps<R: Read> {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 38 |     has_decoded: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 42 |     is_animation: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 43 |     // Is IDAT part of the animation?
[INFO] [stdout] 44 |     idat_anim: bool,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Steps` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `coldepth` and `header` are never read
[INFO] [stdout]    --> src/encode/step_enc.rs:119:5
[INFO] [stdout]     |
[INFO] [stdout] 117 | pub struct StepEnc<W: Write> {
[INFO] [stdout]     |            ------- fields in this struct
[INFO] [stdout] 118 |     encoder: ChunkEnc<W>,
[INFO] [stdout] 119 |     coldepth: Option<(ColorType, u32)>,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 120 |     header: Option<ImageHeader>,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `StepEnc` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [optimized + debuginfo] target(s) in 28.06s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: criterion v0.3.4
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "12531693daafa89c28b17ffceb915331587d35b70a8fce32afa26b8385d33f42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12531693daafa89c28b17ffceb915331587d35b70a8fce32afa26b8385d33f42", kill_on_drop: false }`
[INFO] [stdout] 12531693daafa89c28b17ffceb915331587d35b70a8fce32afa26b8385d33f42
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f71a7cfbf983cd72cd337e4b27f8c5d4c49e1c0c95941553f45fa296b608f02c
[INFO] running `Command { std: "docker" "start" "-a" "f71a7cfbf983cd72cd337e4b27f8c5d4c49e1c0c95941553f45fa296b608f02c", kill_on_drop: false }`
[INFO] [stderr] warning: fields `text`, `langtag`, and `transkey` are never read
[INFO] [stderr]   --> src/decode/steps.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 27 | struct TextEntry {
[INFO] [stderr]    |        --------- fields in this struct
[INFO] [stderr] 28 |     text: String,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 29 |     langtag: Option<String>,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr] 30 |     transkey: Option<String>,
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `TextEntry` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: fields `has_decoded`, `is_animation`, and `idat_anim` are never read
[INFO] [stderr]   --> src/decode/steps.rs:38:5
[INFO] [stderr]    |
[INFO] [stderr] 35 | pub struct Steps<R: Read> {
[INFO] [stderr]    |            ----- fields in this struct
[INFO] [stderr] ...
[INFO] [stderr] 38 |     has_decoded: bool,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 42 |     is_animation: bool,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 43 |     // Is IDAT part of the animation?
[INFO] [stderr] 44 |     idat_anim: bool,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Steps` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: fields `coldepth` and `header` are never read
[INFO] [stderr]    --> src/encode/step_enc.rs:119:5
[INFO] [stderr]     |
[INFO] [stderr] 117 | pub struct StepEnc<W: Write> {
[INFO] [stderr]     |            ------- fields in this struct
[INFO] [stderr] 118 |     encoder: ChunkEnc<W>,
[INFO] [stderr] 119 |     coldepth: Option<(ColorType, u32)>,
[INFO] [stderr]     |     ^^^^^^^^
[INFO] [stderr] 120 |     header: Option<ImageHeader>,
[INFO] [stderr]     |     ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `StepEnc` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: `png_pong` (lib) generated 3 warnings
[INFO] [stderr] warning: `png_pong` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stderr]     Finished test [optimized + debuginfo] target(s) in 0.07s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: criterion v0.3.4
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/png_pong-a4697c4c9a3cd02a)
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests png_pong
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 21) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 21) stdout ----
[INFO] [stdout] Test executable failed (exit status: 101).
[INFO] [stdout] 
[INFO] [stdout] stderr:
[INFO] [stdout] thread 'main' panicked at 'Failed to save image: Os { code: 30, kind: ReadOnlyFilesystem, message: "Read-only file system" }', src/lib.rs:12:41
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x55af9d70646a - std::backtrace_rs::backtrace::libunwind::trace::h2f05d0192276a8f6
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
[INFO] [stdout]    1:     0x55af9d70646a - std::backtrace_rs::backtrace::trace_unsynchronized::hedc23dff7a1af150
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
[INFO] [stdout]    2:     0x55af9d70646a - std::sys_common::backtrace::_print_fmt::h17541ef7592f3ce2
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/sys_common/backtrace.rs:65:5
[INFO] [stdout]    3:     0x55af9d70646a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h20f75df5ab0c0792
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/sys_common/backtrace.rs:44:22
[INFO] [stdout]    4:     0x55af9d720a6f - core::fmt::write::h78109e6f466b3af6
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/core/src/fmt/mod.rs:1254:17
[INFO] [stdout]    5:     0x55af9d7042b5 - std::io::Write::write_fmt::hc59e1b02dd273c8a
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/io/mod.rs:1698:15
[INFO] [stdout]    6:     0x55af9d706235 - std::sys_common::backtrace::_print::h8dac57a9f8fbf9a5
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/sys_common/backtrace.rs:47:5
[INFO] [stdout]    7:     0x55af9d706235 - std::sys_common::backtrace::print::hf9ecbf41d1aa712f
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/sys_common/backtrace.rs:34:9
[INFO] [stdout]    8:     0x55af9d7077be - std::panicking::default_hook::{{closure}}::h04c07acfc84ca028
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/panicking.rs:269:22
[INFO] [stdout]    9:     0x55af9d707565 - std::panicking::default_hook::h01f6bb23e1eceb2c
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/panicking.rs:288:9
[INFO] [stdout]   10:     0x55af9d707d1e - std::panicking::rust_panic_with_hook::h2bb3722bbaf2f6df
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/panicking.rs:691:13
[INFO] [stdout]   11:     0x55af9d707c19 - std::panicking::begin_panic_handler::{{closure}}::h91bc7f36a4be011b
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/panicking.rs:582:13
[INFO] [stdout]   12:     0x55af9d7068d6 - std::sys_common::backtrace::__rust_end_short_backtrace::h8b3d3717114f9e59
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/sys_common/backtrace.rs:150:18
[INFO] [stdout]   13:     0x55af9d707972 - rust_begin_unwind
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/panicking.rs:578:5
[INFO] [stdout]   14:     0x55af9d6bf193 - core::panicking::panic_fmt::hfd368e3fbdabea26
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/core/src/panicking.rs:67:14
[INFO] [stdout]   15:     0x55af9d6bf673 - core::result::unwrap_failed::he54eb4b2f125b26f
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/core/src/result.rs:1687:5
[INFO] [stdout]   16:     0x55af9d6c5153 - core::result::Result<T,E>::expect::h760c968068de51c2
[INFO] [stdout]   17:     0x55af9d6db80b - rust_out::main::_doctest_main_src_lib_rs_21_0::ha0d0f40803230f05
[INFO] [stdout]   18:     0x55af9d6db596 - rust_out::main::h2731449a68dfa004
[INFO] [stdout]   19:     0x55af9d6c29a3 - core::ops::function::FnOnce::call_once::hd1715aa1b26fc35c
[INFO] [stdout]   20:     0x55af9d6c07a6 - std::sys_common::backtrace::__rust_begin_short_backtrace::h8d2b4d09ce515535
[INFO] [stdout]   21:     0x55af9d6c16e9 - std::rt::lang_start::{{closure}}::hc9a918c63b0dc835
[INFO] [stdout]   22:     0x55af9d701e3e - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h2eb19b8ce4148df4
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/core/src/ops/function.rs:287:13
[INFO] [stdout]   23:     0x55af9d701e3e - std::panicking::try::do_call::h2e900feff5d504c5
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/panicking.rs:485:40
[INFO] [stdout]   24:     0x55af9d701e3e - std::panicking::try::h8854836cb85aa9f2
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/panicking.rs:449:19
[INFO] [stdout]   25:     0x55af9d701e3e - std::panic::catch_unwind::h706025dd4c48f64b
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/panic.rs:140:14
[INFO] [stdout]   26:     0x55af9d701e3e - std::rt::lang_start_internal::{{closure}}::h7be5b97f4a07a91a
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/rt.rs:148:48
[INFO] [stdout]   27:     0x55af9d701e3e - std::panicking::try::do_call::h59847e9d0a176965
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/panicking.rs:485:40
[INFO] [stdout]   28:     0x55af9d701e3e - std::panicking::try::h399a918ba8522823
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/panicking.rs:449:19
[INFO] [stdout]   29:     0x55af9d701e3e - std::panic::catch_unwind::hca7ca6c55b2a2e26
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/panic.rs:140:14
[INFO] [stdout]   30:     0x55af9d701e3e - std::rt::lang_start_internal::h2c807a81560459eb
[INFO] [stdout]                                at /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/rt.rs:148:20
[INFO] [stdout]   31:     0x55af9d6c16c7 - std::rt::lang_start::hc4bd3329ce767e23
[INFO] [stdout]   32:     0x55af9d6dba95 - main
[INFO] [stdout]   33:     0x7f836b197d90 - <unknown>
[INFO] [stdout]   34:     0x7f836b197e40 - __libc_start_main
[INFO] [stdout]   35:     0x55af9d6bf7b5 - _start
[INFO] [stdout]   36:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 21)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.39s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "f71a7cfbf983cd72cd337e4b27f8c5d4c49e1c0c95941553f45fa296b608f02c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f71a7cfbf983cd72cd337e4b27f8c5d4c49e1c0c95941553f45fa296b608f02c", kill_on_drop: false }`
[INFO] [stdout] f71a7cfbf983cd72cd337e4b27f8c5d4c49e1c0c95941553f45fa296b608f02c
