[INFO] cloning repository https://github.com/garyemerson/kindle_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/garyemerson/kindle_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgaryemerson%2Fkindle_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgaryemerson%2Fkindle_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 82aa658b8ec3442181ccb917383d809c92ea9f88
[INFO] checking garyemerson/kindle_rust against master#0d37dca25a51fb900a402c94c8818ad1c2789e30 for pr-77526
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgaryemerson%2Fkindle_rust" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/garyemerson/kindle_rust on toolchain 0d37dca25a51fb900a402c94c8818ad1c2789e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-10/source/.cargo/config
[INFO] started tweaking git repo https://github.com/garyemerson/kindle_rust
[INFO] finished tweaking git repo https://github.com/garyemerson/kindle_rust
[INFO] tweaked toml for git repo https://github.com/garyemerson/kindle_rust written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/garyemerson/kindle_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 081dbdf19b726979409ecf381560a5ca5d1829fbf4cd64210439bdaa2803759b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "081dbdf19b726979409ecf381560a5ca5d1829fbf4cd64210439bdaa2803759b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "081dbdf19b726979409ecf381560a5ca5d1829fbf4cd64210439bdaa2803759b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "081dbdf19b726979409ecf381560a5ca5d1829fbf4cd64210439bdaa2803759b", kill_on_drop: false }`
[INFO] [stdout] 081dbdf19b726979409ecf381560a5ca5d1829fbf4cd64210439bdaa2803759b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1eb90386943e1d90491c625c523a62d4162ab5d489fb906cc16f3ccf1b5c91c6
[INFO] running `Command { std: "docker" "start" "-a" "1eb90386943e1d90491c625c523a62d4162ab5d489fb906cc16f3ccf1b5c91c6", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking cfg-if v0.1.5
[INFO] [stderr]    Compiling num-traits v0.2.5
[INFO] [stderr]     Checking nodrop v0.1.12
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]     Checking memoffset v0.2.1
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling proc-macro2 v0.4.13
[INFO] [stderr]    Compiling getrandom v0.1.12
[INFO] [stderr]     Checking adler32 v1.0.3
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling rayon v1.0.2
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.5
[INFO] [stderr]     Checking color_quant v1.0.1
[INFO] [stderr]     Checking lzw v0.10.0
[INFO] [stderr]     Checking scoped_threadpool v0.1.9
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking memmap v0.6.2
[INFO] [stderr]     Checking arrayvec v0.4.7
[INFO] [stderr]     Checking inflate v0.4.3
[INFO] [stderr]     Checking deflate v0.7.18
[INFO] [stderr]     Checking gif v0.10.0
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]    Compiling quote v0.6.6
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking png v0.12.0
[INFO] [stderr]     Checking jpeg-decoder v0.1.15
[INFO] [stderr]    Compiling num-derive v0.2.2
[INFO] [stderr]     Checking image v0.19.0
[INFO] [stderr]     Checking kindle_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `stdout`
[INFO] [stdout]  --> src/main.rs:5:28
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io::{Read, stdin, stdout, Write};
[INFO] [stdout]   |                            ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Rng`, `thread_rng`
[INFO] [stdout]   --> src/main.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 | use rand::{thread_rng, Rng};
[INFO] [stdout]    |            ^^^^^^^^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:157:16
[INFO] [stdout]     |
[INFO] [stdout] 157 |     inner: Box<Iterator<Item=T>>,
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=T>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `stdout`
[INFO] [stdout]  --> src/main.rs:5:28
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io::{Read, stdin, stdout, Write};
[INFO] [stdout]   |                            ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Rng`, `thread_rng`
[INFO] [stdout]   --> src/main.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 | use rand::{thread_rng, Rng};
[INFO] [stdout]    |            ^^^^^^^^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/main.rs:157:16
[INFO] [stdout]     |
[INFO] [stdout] 157 |     inner: Box<Iterator<Item=T>>,
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=T>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/main.rs:326:5
[INFO] [stdout]     |
[INFO] [stdout] 324 |     return;
[INFO] [stdout]     |     ------ any code following this expression is unreachable
[INFO] [stdout] 325 | 
[INFO] [stdout] 326 |     env::set_var("RUST_BACKTRACE", "1");
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/main.rs:326:5
[INFO] [stdout]     |
[INFO] [stdout] 324 |     return;
[INFO] [stdout]     |     ------ any code following this expression is unreachable
[INFO] [stdout] 325 | 
[INFO] [stdout] 326 |     env::set_var("RUST_BACKTRACE", "1");
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]  --> src/main.rs:5:36
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io::{Read, stdin, stdout, Write};
[INFO] [stdout]   |                                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]  --> src/main.rs:5:36
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io::{Read, stdin, stdout, Write};
[INFO] [stdout]   |                                    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `waveform_mode`
[INFO] [stdout]   --> src/main.rs:77:11
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn foobar(waveform_mode: u32, update_mode: u32, update_marker: u32, ) -> Result<(), String> {
[INFO] [stdout]    |           ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_waveform_mode`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `update_mode`
[INFO] [stdout]   --> src/main.rs:77:31
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn foobar(waveform_mode: u32, update_mode: u32, update_marker: u32, ) -> Result<(), String> {
[INFO] [stdout]    |                               ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_update_mode`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `update_marker`
[INFO] [stdout]   --> src/main.rs:77:49
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn foobar(waveform_mode: u32, update_mode: u32, update_marker: u32, ) -> Result<(), String> {
[INFO] [stdout]    |                                                 ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_update_marker`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `height`
[INFO] [stdout]    --> src/main.rs:290:5
[INFO] [stdout]     |
[INFO] [stdout] 290 |     height: u32,
[INFO] [stdout]     |     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_height`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `waveform_mode`
[INFO] [stdout]   --> src/main.rs:77:11
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn foobar(waveform_mode: u32, update_mode: u32, update_marker: u32, ) -> Result<(), String> {
[INFO] [stdout]    |           ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_waveform_mode`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `update_mode`
[INFO] [stdout]   --> src/main.rs:77:31
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn foobar(waveform_mode: u32, update_mode: u32, update_marker: u32, ) -> Result<(), String> {
[INFO] [stdout]    |                               ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_update_mode`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `update_marker`
[INFO] [stdout]   --> src/main.rs:77:49
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn foobar(waveform_mode: u32, update_mode: u32, update_marker: u32, ) -> Result<(), String> {
[INFO] [stdout]    |                                                 ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_update_marker`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `height`
[INFO] [stdout]    --> src/main.rs:290:5
[INFO] [stdout]     |
[INFO] [stdout] 290 |     height: u32,
[INFO] [stdout]     |     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_height`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `foo_draw`
[INFO] [stdout]    --> src/main.rs:285:4
[INFO] [stdout]     |
[INFO] [stdout] 285 | fn foo_draw(
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `foo_draw`
[INFO] [stdout]    --> src/main.rs:285:4
[INFO] [stdout]     |
[INFO] [stdout] 285 | fn foo_draw(
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 25.14s
[INFO] running `Command { std: "docker" "inspect" "1eb90386943e1d90491c625c523a62d4162ab5d489fb906cc16f3ccf1b5c91c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1eb90386943e1d90491c625c523a62d4162ab5d489fb906cc16f3ccf1b5c91c6", kill_on_drop: false }`
[INFO] [stdout] 1eb90386943e1d90491c625c523a62d4162ab5d489fb906cc16f3ccf1b5c91c6