[INFO] cloning repository https://github.com/EdGavin98/PNG-Decoder
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/EdGavin98/PNG-Decoder" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEdGavin98%2FPNG-Decoder", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEdGavin98%2FPNG-Decoder'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d050986d0568c8998e6e35c4eaeba42c22aa7940
[INFO] checking EdGavin98/PNG-Decoder against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEdGavin98%2FPNG-Decoder" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/EdGavin98/PNG-Decoder
[INFO] finished tweaking git repo https://github.com/EdGavin98/PNG-Decoder
[INFO] tweaked toml for git repo https://github.com/EdGavin98/PNG-Decoder written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/EdGavin98/PNG-Decoder on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/EdGavin98/PNG-Decoder 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 03e26af72a1d67a3c1d858157d8fac5af3b96d1f1213b008afbabb4de9d12966
[INFO] running `Command { std: "docker" "start" "-a" "03e26af72a1d67a3c1d858157d8fac5af3b96d1f1213b008afbabb4de9d12966", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "03e26af72a1d67a3c1d858157d8fac5af3b96d1f1213b008afbabb4de9d12966", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03e26af72a1d67a3c1d858157d8fac5af3b96d1f1213b008afbabb4de9d12966", kill_on_drop: false }`
[INFO] [stdout] 03e26af72a1d67a3c1d858157d8fac5af3b96d1f1213b008afbabb4de9d12966
[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=forbid -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 812a9c65b3a93dfb6f0948ee889e2359ed40a1a81297580fb64713aa62d462bd
[INFO] running `Command { std: "docker" "start" "-a" "812a9c65b3a93dfb6f0948ee889e2359ed40a1a81297580fb64713aa62d462bd", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling build_const v0.2.1
[INFO] [stderr]    Compiling anyhow v1.0.31
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.3
[INFO] [stderr]    Compiling proc-macro-error v1.0.3
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.1
[INFO] [stderr]    Compiling structopt-derive v0.4.8
[INFO] [stderr]     Checking structopt v0.3.15
[INFO] [stderr]     Checking pngme v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/png.rs:96:19
[INFO] [stdout]    |
[INFO] [stdout] 96 |     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `data` is never used
[INFO] [stdout]   --> src/chunk.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Chunk {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 33 |     pub fn data(&self) -> &[u8] {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `is_valid`, `is_critical`, `is_public`, `is_reserved_bit_valid`, and `is_safe_to_copy` are never used
[INFO] [stdout]   --> src/chunk_type.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl ChunkType {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn is_valid(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     pub fn is_critical(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn is_public(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 28 |     pub fn is_reserved_bit_valid(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn is_safe_to_copy(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `from_chunks`, `header`, and `chunks` are never used
[INFO] [stdout]   --> src/png.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl Png {
[INFO] [stdout]    | -------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 17 |     pub fn from_chunks(chunks: Vec<Chunk>) -> Png {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 45 |     pub fn header(&self) -> &[u8; 8] {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 49 |     pub fn chunks(&self) -> &[Chunk] {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<PathBuf, Infallible>
[INFO] [stdout]  --> src/args.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | /     #[structopt(short, long)]
[INFO] [stdout] 7 | |     pub file: PathBuf,
[INFO] [stdout]   | |_____________________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]  --> src/args.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | /     #[structopt(short, long)]
[INFO] [stdout] 9 | |     pub chunk_name: String,
[INFO] [stdout]   | |__________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/args.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | /     #[structopt(short, long)]
[INFO] [stdout] 11 | |     pub message: String,
[INFO] [stdout]    | |_______________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/args.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | /     #[structopt(short, long)]
[INFO] [stdout] 13 | |     pub output_file: Option<PathBuf>,
[INFO] [stdout]    | |____________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/args.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | /     #[structopt(short, long)]
[INFO] [stdout] 19 | |     pub file: PathBuf,
[INFO] [stdout]    | |_____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/args.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | /     #[structopt(short, long)]
[INFO] [stdout] 21 | |     pub chunk_name: String,
[INFO] [stdout]    | |__________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/args.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | /     #[structopt(short, long)]
[INFO] [stdout] 27 | |     pub file: PathBuf,
[INFO] [stdout]    | |_____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/args.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | /     #[structopt(short, long)]
[INFO] [stdout] 29 | |     pub chunk_name: String,
[INFO] [stdout]    | |__________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pngme` (bin "pngme") due to 8 previous errors; 4 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/png.rs:96:19
[INFO] [stdout]    |
[INFO] [stdout] 96 |     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `data` is never used
[INFO] [stdout]   --> src/chunk.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Chunk {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 33 |     pub fn data(&self) -> &[u8] {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `header` is never used
[INFO] [stdout]   --> src/png.rs:45:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl Png {
[INFO] [stdout]    | -------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 45 |     pub fn header(&self) -> &[u8; 8] {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<PathBuf, Infallible>
[INFO] [stdout]  --> src/args.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | /     #[structopt(short, long)]
[INFO] [stdout] 7 | |     pub file: PathBuf,
[INFO] [stdout]   | |_____________________^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]  --> src/args.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | /     #[structopt(short, long)]
[INFO] [stdout] 9 | |     pub chunk_name: String,
[INFO] [stdout]   | |__________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/args.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | /     #[structopt(short, long)]
[INFO] [stdout] 11 | |     pub message: String,
[INFO] [stdout]    | |_______________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/args.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | /     #[structopt(short, long)]
[INFO] [stdout] 13 | |     pub output_file: Option<PathBuf>,
[INFO] [stdout]    | |____________________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/args.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | /     #[structopt(short, long)]
[INFO] [stdout] 19 | |     pub file: PathBuf,
[INFO] [stdout]    | |_____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/args.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | /     #[structopt(short, long)]
[INFO] [stdout] 21 | |     pub chunk_name: String,
[INFO] [stdout]    | |__________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<PathBuf, Infallible>
[INFO] [stdout]   --> src/args.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 | /     #[structopt(short, long)]
[INFO] [stdout] 27 | |     pub file: PathBuf,
[INFO] [stdout]    | |_____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/args.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 | /     #[structopt(short, long)]
[INFO] [stdout] 29 | |     pub chunk_name: String,
[INFO] [stdout]    | |__________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pngme` (bin "pngme" test) due to 8 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "812a9c65b3a93dfb6f0948ee889e2359ed40a1a81297580fb64713aa62d462bd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "812a9c65b3a93dfb6f0948ee889e2359ed40a1a81297580fb64713aa62d462bd", kill_on_drop: false }`
[INFO] [stdout] 812a9c65b3a93dfb6f0948ee889e2359ed40a1a81297580fb64713aa62d462bd