[INFO] cloning repository https://github.com/bcliden/PngCushion
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bcliden/PngCushion" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbcliden%2FPngCushion", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbcliden%2FPngCushion'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4e1e6a729944c6fb43aeed0d89a401e62c505c1d
[INFO] checking bcliden/PngCushion 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%2Fbcliden%2FPngCushion" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/bcliden/PngCushion
[INFO] finished tweaking git repo https://github.com/bcliden/PngCushion
[INFO] tweaked toml for git repo https://github.com/bcliden/PngCushion written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/bcliden/PngCushion 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/bcliden/PngCushion 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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 86c09fe95070802f6591159940566e7e782f018ddd1c0c646531673778391791
[INFO] running `Command { std: "docker" "start" "-a" "86c09fe95070802f6591159940566e7e782f018ddd1c0c646531673778391791", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "86c09fe95070802f6591159940566e7e782f018ddd1c0c646531673778391791", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86c09fe95070802f6591159940566e7e782f018ddd1c0c646531673778391791", kill_on_drop: false }`
[INFO] [stdout] 86c09fe95070802f6591159940566e7e782f018ddd1c0c646531673778391791
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 89f4bcb82a5713fde68ffac68bc8a394fb38fe50311c06239dc48ba656f91e41
[INFO] running `Command { std: "docker" "start" "-a" "89f4bcb82a5713fde68ffac68bc8a394fb38fe50311c06239dc48ba656f91e41", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]     Checking os_str_bytes v6.0.1
[INFO] [stderr]     Checking crc-catalog v2.1.0
[INFO] [stderr]    Compiling indexmap v1.8.1
[INFO] [stderr]     Checking textwrap v0.15.0
[INFO] [stderr]     Checking crc v3.0.0
[INFO] [stderr]     Checking clap_lex v0.2.0
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling clap_derive v3.1.18
[INFO] [stderr]     Checking clap v3.1.18
[INFO] [stderr]     Checking png-cushion v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::str::FromStr`
[INFO] [stdout]    --> src/png.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |     use std::str::FromStr;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `header` is never used
[INFO] [stdout]   --> src/png.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl Png {
[INFO] [stdout]    | -------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn header(&self) -> &[u8; 8] {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | /     #[clap(help = "What chunk key to add your message to")]
[INFO] [stdout] 37 | |     pub chunk_type: String,
[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<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | /     #[clap(help = "Secret message to pass into the PNG file")]
[INFO] [stdout] 40 | |     pub message: String,
[INFO] [stdout]    | |_______________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | /     #[clap(help = "What chunk key to read a message from")]
[INFO] [stdout] 52 | |     pub chunk_type: String,
[INFO] [stdout]    | |__________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 | /     #[clap(help = "What chunk key to remove from the PNG")]
[INFO] [stdout] 61 | |     pub chunk_type: String,
[INFO] [stdout]    | |__________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `valid_PNG_bytes` should have a snake case name
[INFO] [stdout]  --> src/chunk_type.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn valid_PNG_bytes(bytes: [u8; 4]) -> bool {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `valid_png_bytes`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_fifth_bit` is never used
[INFO] [stdout]  --> src/chunk_type.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn get_fifth_bit(byte: u8) -> 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:20:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl ChunkType {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 20 |     pub fn is_valid(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 24 |     pub fn is_critical(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 29 |     pub fn is_public(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 34 |     pub fn is_reserved_bit_valid(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 39 |     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:12:12
[INFO] [stdout]    |
[INFO] [stdout]  9 | impl Png {
[INFO] [stdout]    | -------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 12 |     pub fn from_chunks(chunks: Vec<Chunk>) -> Png {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn header(&self) -> &[u8; 8] {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn chunks(&self) -> &[Chunk] {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `png-cushion` (bin "png-cushion" test) due to 4 previous errors; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | /     #[clap(help = "What chunk key to add your message to")]
[INFO] [stdout] 37 | |     pub chunk_type: String,
[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<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | /     #[clap(help = "Secret message to pass into the PNG file")]
[INFO] [stdout] 40 | |     pub message: String,
[INFO] [stdout]    | |_______________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | /     #[clap(help = "What chunk key to read a message from")]
[INFO] [stdout] 52 | |     pub chunk_type: String,
[INFO] [stdout]    | |__________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/args.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 | /     #[clap(help = "What chunk key to remove from the PNG")]
[INFO] [stdout] 61 | |     pub chunk_type: String,
[INFO] [stdout]    | |__________________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `valid_PNG_bytes` should have a snake case name
[INFO] [stdout]  --> src/chunk_type.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn valid_PNG_bytes(bytes: [u8; 4]) -> bool {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `valid_png_bytes`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `png-cushion` (bin "png-cushion") due to 4 previous errors; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "89f4bcb82a5713fde68ffac68bc8a394fb38fe50311c06239dc48ba656f91e41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89f4bcb82a5713fde68ffac68bc8a394fb38fe50311c06239dc48ba656f91e41", kill_on_drop: false }`
[INFO] [stdout] 89f4bcb82a5713fde68ffac68bc8a394fb38fe50311c06239dc48ba656f91e41