[INFO] cloning repository https://github.com/gregorioD/PNGme
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gregorioD/PNGme" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FgregorioD%2FPNGme", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FgregorioD%2FPNGme'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ff5e5bec87874473ee5cac61afea8b5a3385a239
[INFO] checking gregorioD/PNGme against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FgregorioD%2FPNGme" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gregorioD/PNGme on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gregorioD/PNGme
[INFO] finished tweaking git repo https://github.com/gregorioD/PNGme
[INFO] tweaked toml for git repo https://github.com/gregorioD/PNGme written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/gregorioD/PNGme 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded clap v4.4.0
[INFO] [stderr]   Downloaded clap_builder v4.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ff707e4c982d505f97a18d3cc4037c1024f02572bfc7244c2a694aab19c12d24
[INFO] running `Command { std: "docker" "start" "-a" "ff707e4c982d505f97a18d3cc4037c1024f02572bfc7244c2a694aab19c12d24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff707e4c982d505f97a18d3cc4037c1024f02572bfc7244c2a694aab19c12d24", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff707e4c982d505f97a18d3cc4037c1024f02572bfc7244c2a694aab19c12d24", kill_on_drop: false }`
[INFO] [stdout] ff707e4c982d505f97a18d3cc4037c1024f02572bfc7244c2a694aab19c12d24
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ec4fed49071b480cf9e55ea72abcd5d423d583fb693136c407b5885e7b9a5dfd
[INFO] running `Command { std: "docker" "start" "-a" "ec4fed49071b480cf9e55ea72abcd5d423d583fb693136c407b5885e7b9a5dfd", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.63
[INFO] [stderr]    Compiling quote v1.0.29
[INFO] [stderr]    Compiling unicode-ident v1.0.10
[INFO] [stderr]     Checking anstyle v1.0.2
[INFO] [stderr]     Checking clap_lex v0.5.1
[INFO] [stderr]     Checking crc-catalog v2.2.0
[INFO] [stderr]     Checking crc v3.0.1
[INFO] [stderr]     Checking anstream v0.5.0
[INFO] [stderr]     Checking clap_builder v4.4.0
[INFO] [stderr]    Compiling syn v2.0.23
[INFO] [stderr]    Compiling clap_derive v4.4.0
[INFO] [stderr]     Checking clap v4.4.0
[INFO] [stderr]     Checking pngme v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `chunk_type`
[INFO] [stdout]  --> src/chunk.rs:9:13
[INFO] [stdout]   |
[INFO] [stdout] 9 | use crate::{chunk_type, Error};
[INFO] [stdout]   |             ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `chunk_type`
[INFO] [stdout]  --> src/chunk.rs:9:13
[INFO] [stdout]   |
[INFO] [stdout] 9 | use crate::{chunk_type, Error};
[INFO] [stdout]   |             ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ChunkType` is imported redundantly
[INFO] [stdout]    --> src/chunk.rs:184:9
[INFO] [stdout]     |
[INFO] [stdout] 183 |     use super::*;
[INFO] [stdout]     |         -------- the item `ChunkType` is already imported here
[INFO] [stdout] 184 |     use crate::chunk_type::ChunkType;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromStr` is imported redundantly
[INFO] [stdout]    --> src/chunk.rs:185:9
[INFO] [stdout]     |
[INFO] [stdout] 183 |     use super::*;
[INFO] [stdout]     |         -------- the item `FromStr` is already imported here
[INFO] [stdout] 184 |     use crate::chunk_type::ChunkType;
[INFO] [stdout] 185 |     use std::str::FromStr;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]    --> src/chunk_type.rs:118:9
[INFO] [stdout]     |
[INFO] [stdout] 118 |     use std::convert::TryFrom;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]     |
[INFO] [stdout]     = note: the item `TryFrom` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `FromStr` is imported redundantly
[INFO] [stdout]    --> src/chunk_type.rs:119:9
[INFO] [stdout]     |
[INFO] [stdout] 117 |     use super::*;
[INFO] [stdout]     |         -------- the item `FromStr` is already imported here
[INFO] [stdout] 118 |     use std::convert::TryFrom;
[INFO] [stdout] 119 |     use std::str::FromStr;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Chunk` is imported redundantly
[INFO] [stdout]    --> src/png.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |     use super::*;
[INFO] [stdout]     |         -------- the item `Chunk` is already imported here
[INFO] [stdout] 144 |     use crate::chunk::Chunk;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `TryFrom` is imported redundantly
[INFO] [stdout]    --> src/png.rs:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |     use std::convert::TryFrom;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:148:13
[INFO] [stdout]     |
[INFO] [stdout]     = note: the item `TryFrom` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `length` is never read
[INFO] [stdout]   --> src/chunk.rs:39:17
[INFO] [stdout]    |
[INFO] [stdout] 39 |         let mut length = 0;
[INFO] [stdout]    |                 ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/png.rs:34:31
[INFO] [stdout]    |
[INFO] [stdout] 34 |                     if let Ok(e) = reader.read_exact(&mut crc_buf) {
[INFO] [stdout]    |                               ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]    --> src/png.rs:122:5
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn as_bytes(&self) -> Vec<u8> {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] 123 |         self.as_bytes()
[INFO] [stdout]     |         --------------- recursive call site
[INFO] [stdout]     |
[INFO] [stdout]     = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]     = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ChunkByteError` is never constructed
[INFO] [stdout]   --> src/chunk.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct ChunkByteError;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `chunk_from_strings` and `as_bytes` are never used
[INFO] [stdout]    --> src/chunk.rs:118:12
[INFO] [stdout]     |
[INFO] [stdout] 90  | impl Chunk {
[INFO] [stdout]     | ---------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 118 |     pub fn chunk_from_strings(
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 137 |     pub fn as_bytes(&self) -> Vec<u8> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `is_valid`, `i_is_uppercase`, `is_critical`, `is_public`, `is_reserved_bit_valid`, and `is_safe_to_copy` are never used
[INFO] [stdout]    --> src/chunk_type.rs:76:8
[INFO] [stdout]     |
[INFO] [stdout] 64  | impl ChunkType {
[INFO] [stdout]     | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 76  |     fn is_valid(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 90  |     fn i_is_uppercase(&self, i: usize) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 98  |     fn is_critical(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 102 |     fn is_public(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 106 |     fn is_reserved_bit_valid(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 110 |     fn is_safe_to_copy(&self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `signature` is never read
[INFO] [stdout]   --> src/png.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Png {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] 11 |     signature: [u8; 8],
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated functions `from_chunks` and `from_file` are never used
[INFO] [stdout]    --> src/png.rs:83:8
[INFO] [stdout]     |
[INFO] [stdout] 72  | impl Png {
[INFO] [stdout]     | -------- associated functions in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 83  |     fn from_chunks(chunks: Vec<Chunk>) -> Png {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 126 |     pub fn from_file<P: AsRef<Path>>(path: P) -> Result<Self, std::io::Error> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `length` is never read
[INFO] [stdout]   --> src/chunk.rs:39:17
[INFO] [stdout]    |
[INFO] [stdout] 39 |         let mut length = 0;
[INFO] [stdout]    |                 ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/png.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         reader.read_exact(&mut signature_buf);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 27 |         let _ = reader.read_exact(&mut signature_buf);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chunk`
[INFO] [stdout]    --> src/chunk.rs:239:13
[INFO] [stdout]     |
[INFO] [stdout] 239 |         let chunk = testing_chunk();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_chunk`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/png.rs:34:31
[INFO] [stdout]    |
[INFO] [stdout] 34 |                     if let Ok(e) = reader.read_exact(&mut crc_buf) {
[INFO] [stdout]    |                               ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]    --> src/png.rs:122:5
[INFO] [stdout]     |
[INFO] [stdout] 122 |     pub fn as_bytes(&self) -> Vec<u8> {
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot return without recursing
[INFO] [stdout] 123 |         self.as_bytes()
[INFO] [stdout]     |         --------------- recursive call site
[INFO] [stdout]     |
[INFO] [stdout]     = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]     = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ChunkByteError` is never constructed
[INFO] [stdout]   --> src/chunk.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | struct ChunkByteError;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `signature` is never read
[INFO] [stdout]   --> src/png.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Png {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] 11 |     signature: [u8; 8],
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `from_file` is never used
[INFO] [stdout]    --> src/png.rs:126:12
[INFO] [stdout]     |
[INFO] [stdout] 72  | impl Png {
[INFO] [stdout]     | -------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 126 |     pub fn from_file<P: AsRef<Path>>(path: P) -> Result<Self, std::io::Error> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/png.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         reader.read_exact(&mut signature_buf);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 27 |         let _ = reader.read_exact(&mut signature_buf);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.92s
[INFO] running `Command { std: "docker" "inspect" "ec4fed49071b480cf9e55ea72abcd5d423d583fb693136c407b5885e7b9a5dfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec4fed49071b480cf9e55ea72abcd5d423d583fb693136c407b5885e7b9a5dfd", kill_on_drop: false }`
[INFO] [stdout] ec4fed49071b480cf9e55ea72abcd5d423d583fb693136c407b5885e7b9a5dfd