[INFO] cloning repository https://github.com/villarjorge/pngme
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/villarjorge/pngme" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvillarjorge%2Fpngme", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvillarjorge%2Fpngme'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 03659cc873e575ce0dbadaf03a6c0b79daef5a12
[INFO] building villarjorge/pngme against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvillarjorge%2Fpngme" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/villarjorge/pngme on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/villarjorge/pngme
[INFO] finished tweaking git repo https://github.com/villarjorge/pngme
[INFO] tweaked toml for git repo https://github.com/villarjorge/pngme written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/villarjorge/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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded crc-catalog v1.1.1
[INFO] [stderr]   Downloaded crc v2.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bc6ba1377ea800b33b275d3ba8235a3ec02fd47cd9a4ce3fde5b8dc58dede100
[INFO] running `Command { std: "docker" "start" "-a" "bc6ba1377ea800b33b275d3ba8235a3ec02fd47cd9a4ce3fde5b8dc58dede100", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bc6ba1377ea800b33b275d3ba8235a3ec02fd47cd9a4ce3fde5b8dc58dede100", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc6ba1377ea800b33b275d3ba8235a3ec02fd47cd9a4ce3fde5b8dc58dede100", kill_on_drop: false }`
[INFO] [stdout] bc6ba1377ea800b33b275d3ba8235a3ec02fd47cd9a4ce3fde5b8dc58dede100
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 95f3f186893a5b7769fdd8a1e4426e1ac5002fb1ae616e55ae5fd3e372ed1013
[INFO] running `Command { std: "docker" "start" "-a" "95f3f186893a5b7769fdd8a1e4426e1ac5002fb1ae616e55ae5fd3e372ed1013", kill_on_drop: false }`
[INFO] [stderr]    Compiling crc-catalog v1.1.1
[INFO] [stderr]    Compiling crc v2.1.0
[INFO] [stderr]    Compiling pngme v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::env`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::env; // https://doc.rust-lang.org/book/ch12-01-accepting-command-line-arguments.html
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `PngMeArgs` is never used
[INFO] [stdout]  --> src/args.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub enum PngMeArgs {
[INFO] [stdout]   |          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `EncodeArgs` is never constructed
[INFO] [stdout]   --> src/args.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct EncodeArgs {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DecodeArgs` is never constructed
[INFO] [stdout]   --> src/args.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct DecodeArgs {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RemoveArgs` is never constructed
[INFO] [stdout]   --> src/args.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub struct RemoveArgs {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PrintArgs` is never constructed
[INFO] [stdout]   --> src/args.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub struct PrintArgs {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `data_as_string` are never used
[INFO] [stdout]   --> src/chunk.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl Chunk {
[INFO] [stdout]    | ---------- associated items in this implementation
[INFO] [stdout] 18 |     /// Creates a new chunk from a Chunk type and a vector of u8
[INFO] [stdout] 19 |     pub fn new(chunk_type: ChunkType, data: Vec<u8>) -> Chunk {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 54 |     pub fn data_as_string(&self) -> Result<String, FromUtf8Error> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `is_critical`, `is_public`, and `is_safe_to_copy` are never used
[INFO] [stdout]   --> src/chunk_type.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl ChunkType {
[INFO] [stdout]    | -------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 18 |     pub fn is_critical(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |     pub fn is_public(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 54 |     pub fn is_safe_to_copy(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `from_chunks`, `append_chunk`, `remove_first_chunk`, `chunk_by_type`, and `as_bytes` are never used
[INFO] [stdout]   --> src/png.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl Png {
[INFO] [stdout]    | -------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 18 |     pub fn from_chunks(chunks: Vec<Chunk>) -> Png {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 22 |     pub fn append_chunk(&mut self, chunk: Chunk) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     pub fn remove_first_chunk(&mut self, chunk_type: &str) -> Result<Chunk, &str> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 52 |     pub fn chunk_by_type(&self, chunk_type: &str) -> Option<&Chunk> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 62 |     pub fn as_bytes(&self) -> Vec<u8> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.50s
[INFO] running `Command { std: "docker" "inspect" "95f3f186893a5b7769fdd8a1e4426e1ac5002fb1ae616e55ae5fd3e372ed1013", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95f3f186893a5b7769fdd8a1e4426e1ac5002fb1ae616e55ae5fd3e372ed1013", kill_on_drop: false }`
[INFO] [stdout] 95f3f186893a5b7769fdd8a1e4426e1ac5002fb1ae616e55ae5fd3e372ed1013
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dca05e978a984429d4970185062aa9b28e5c810ad768aa9be76b269f9f74944a
[INFO] running `Command { std: "docker" "start" "-a" "dca05e978a984429d4970185062aa9b28e5c810ad768aa9be76b269f9f74944a", kill_on_drop: false }`
[INFO] [stderr]    Compiling pngme v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::env`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::env; // https://doc.rust-lang.org/book/ch12-01-accepting-command-line-arguments.html
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `PngMeArgs` is never used
[INFO] [stdout]  --> src/args.rs:5:10
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub enum PngMeArgs {
[INFO] [stdout]   |          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `EncodeArgs` is never constructed
[INFO] [stdout]   --> src/args.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct EncodeArgs {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `DecodeArgs` is never constructed
[INFO] [stdout]   --> src/args.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct DecodeArgs {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `RemoveArgs` is never constructed
[INFO] [stdout]   --> src/args.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub struct RemoveArgs {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PrintArgs` is never constructed
[INFO] [stdout]   --> src/args.rs:38:12
[INFO] [stdout]    |
[INFO] [stdout] 38 | pub struct PrintArgs {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.83s
[INFO] running `Command { std: "docker" "inspect" "dca05e978a984429d4970185062aa9b28e5c810ad768aa9be76b269f9f74944a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dca05e978a984429d4970185062aa9b28e5c810ad768aa9be76b269f9f74944a", kill_on_drop: false }`
[INFO] [stdout] dca05e978a984429d4970185062aa9b28e5c810ad768aa9be76b269f9f74944a