[INFO] cloning repository https://github.com/Bulmenisaurus/rust-png
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Bulmenisaurus/rust-png" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBulmenisaurus%2Frust-png", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBulmenisaurus%2Frust-png'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 05627b85de5bd856322a20ee5b0f4db703987ae5
[INFO] building Bulmenisaurus/rust-png 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%2FBulmenisaurus%2Frust-png" "/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/Bulmenisaurus/rust-png 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/Bulmenisaurus/rust-png
[INFO] finished tweaking git repo https://github.com/Bulmenisaurus/rust-png
[INFO] tweaked toml for git repo https://github.com/Bulmenisaurus/rust-png written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Bulmenisaurus/rust-png 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] 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] ad9a6e062a6bae5edc83e5d33db511ceb5d502225c7798776c699da91ac91117
[INFO] running `Command { std: "docker" "start" "-a" "ad9a6e062a6bae5edc83e5d33db511ceb5d502225c7798776c699da91ac91117", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ad9a6e062a6bae5edc83e5d33db511ceb5d502225c7798776c699da91ac91117", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad9a6e062a6bae5edc83e5d33db511ceb5d502225c7798776c699da91ac91117", kill_on_drop: false }`
[INFO] [stdout] ad9a6e062a6bae5edc83e5d33db511ceb5d502225c7798776c699da91ac91117
[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] bacf2248e4a48f53287fbb08d4f79ff335dcfb2e61beedf220d06dde891dcd9d
[INFO] running `Command { std: "docker" "start" "-a" "bacf2248e4a48f53287fbb08d4f79ff335dcfb2e61beedf220d06dde891dcd9d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling crc-catalog v1.1.1
[INFO] [stderr]    Compiling deflate v1.0.0
[INFO] [stderr]    Compiling crc v2.1.0
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling png v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.84s
[INFO] running `Command { std: "docker" "inspect" "bacf2248e4a48f53287fbb08d4f79ff335dcfb2e61beedf220d06dde891dcd9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bacf2248e4a48f53287fbb08d4f79ff335dcfb2e61beedf220d06dde891dcd9d", kill_on_drop: false }`
[INFO] [stdout] bacf2248e4a48f53287fbb08d4f79ff335dcfb2e61beedf220d06dde891dcd9d
[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] a6e0545472f9ab88c933e4e0bfba89abfc9053e072617870ea1e3edfe49c9e7a
[INFO] running `Command { std: "docker" "start" "-a" "a6e0545472f9ab88c933e4e0bfba89abfc9053e072617870ea1e3edfe49c9e7a", kill_on_drop: false }`
[INFO] [stderr]    Compiling png v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `a` is never read
[INFO] [stdout]   --> examples/fractal2.rs:73:14
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let (mut a, mut b, mut c, mut d, mut e, mut f, mut g) = (
[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: value assigned to `b` is never read
[INFO] [stdout]   --> examples/fractal2.rs:73:21
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let (mut a, mut b, mut c, mut d, mut e, mut f, mut g) = (
[INFO] [stdout]    |                     ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `d` is never read
[INFO] [stdout]   --> examples/fractal2.rs:73:35
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let (mut a, mut b, mut c, mut d, mut e, mut f, mut g) = (
[INFO] [stdout]    |                                   ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `e` is never read
[INFO] [stdout]   --> examples/fractal2.rs:73:42
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let (mut a, mut b, mut c, mut d, mut e, mut f, mut g) = (
[INFO] [stdout]    |                                          ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `f` is never read
[INFO] [stdout]   --> examples/fractal2.rs:73:49
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let (mut a, mut b, mut c, mut d, mut e, mut f, mut g) = (
[INFO] [stdout]    |                                                 ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `g`
[INFO] [stdout]   --> examples/fractal2.rs:73:56
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let (mut a, mut b, mut c, mut d, mut e, mut f, mut g) = (
[INFO] [stdout]    |                                                        ^ help: if this is intentional, prefix it with an underscore: `_g`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `b` is never read
[INFO] [stdout]   --> examples/fractal2.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |         b = a.square().add_to_complex(u);
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `d` is never read
[INFO] [stdout]    --> examples/fractal2.rs:104:9
[INFO] [stdout]     |
[INFO] [stdout] 104 |         d = f.square().add_to_complex(u);
[INFO] [stdout]     |         ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `e` is never read
[INFO] [stdout]    --> examples/fractal2.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |         e = d.square().add_to_complex(u);
[INFO] [stdout]     |         ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/fractal2.rs:73:52
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let (mut a, mut b, mut c, mut d, mut e, mut f, mut g) = (
[INFO] [stdout]    |                                                    ----^
[INFO] [stdout]    |                                                    |
[INFO] [stdout]    |                                                    help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `multiply_by_real` and `add_to_real` are never used
[INFO] [stdout]   --> examples/fractal2.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl Complex {
[INFO] [stdout]    | ------------ methods in this implementation
[INFO] [stdout] 15 |     fn multiply_by_real(&self, by: f64) -> Complex {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 |     fn add_to_real(&self, to: f64) -> Complex {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `whole_part`
[INFO] [stdout]   --> examples/continued_fraction.rs:35:14
[INFO] [stdout]    |
[INFO] [stdout] 35 |         let (whole_part, new_numerator, new_denominator) = get_whole_part(n, d);
[INFO] [stdout]    |              ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_whole_part`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `multiply_by_real` is never used
[INFO] [stdout]   --> examples/fractal.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl Complex {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 15 |     fn multiply_by_real(&self, by: f64) -> Complex {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `Command { std: "docker" "inspect" "a6e0545472f9ab88c933e4e0bfba89abfc9053e072617870ea1e3edfe49c9e7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6e0545472f9ab88c933e4e0bfba89abfc9053e072617870ea1e3edfe49c9e7a", kill_on_drop: false }`
[INFO] [stdout] a6e0545472f9ab88c933e4e0bfba89abfc9053e072617870ea1e3edfe49c9e7a