[INFO] fetching crate mono_display 0.1.0...
[INFO] testing mono_display-0.1.0 against beta-2022-02-22 for beta-1.60-1
[INFO] extracting crate mono_display 0.1.0 into /workspace/builds/worker-22/source
[INFO] validating manifest of crates.io crate mono_display 0.1.0 on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mono_display 0.1.0
[INFO] finished tweaking crates.io crate mono_display 0.1.0
[INFO] tweaked toml for crates.io crate mono_display 0.1.0 written to /workspace/builds/worker-22/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded sdl2 v0.31.0
[INFO] [stderr]   Downloaded bit-set v0.3.0
[INFO] [stderr]   Downloaded sdl2-sys v0.31.0
[INFO] [stderr]   Downloaded bdf v0.5.5
[INFO] [stderr]   Downloaded rppal v0.7.1
[INFO] [stderr]   Downloaded font-rs v0.1.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 24c204e8126a9b1939183e82e04910f4e20cb3dcb497993ef274aba95f1c1aab
[INFO] running `Command { std: "docker" "start" "-a" "24c204e8126a9b1939183e82e04910f4e20cb3dcb497993ef274aba95f1c1aab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "24c204e8126a9b1939183e82e04910f4e20cb3dcb497993ef274aba95f1c1aab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24c204e8126a9b1939183e82e04910f4e20cb3dcb497993ef274aba95f1c1aab", kill_on_drop: false }`
[INFO] [stdout] 24c204e8126a9b1939183e82e04910f4e20cb3dcb497993ef274aba95f1c1aab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a3e833e13d16f9ea0ea3e6038c567c3b0a585a2ca7bc1adda61e4c6caec576c5
[INFO] running `Command { std: "docker" "start" "-a" "a3e833e13d16f9ea0ea3e6038c567c3b0a585a2ca7bc1adda61e4c6caec576c5", kill_on_drop: false }`
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling rppal v0.7.1
[INFO] [stderr]    Compiling bit-set v0.3.0
[INFO] [stderr]    Compiling bdf v0.5.5
[INFO] [stderr]    Compiling font-rs v0.1.3
[INFO] [stderr]    Compiling mono_display v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ssd1306.rs:188:21
[INFO] [stdout]     |
[INFO] [stdout] 188 |                 let mut end = pos + find_span_end(&old[pos..], &new[pos..]);
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.33s
[INFO] running `Command { std: "docker" "inspect" "a3e833e13d16f9ea0ea3e6038c567c3b0a585a2ca7bc1adda61e4c6caec576c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3e833e13d16f9ea0ea3e6038c567c3b0a585a2ca7bc1adda61e4c6caec576c5", kill_on_drop: false }`
[INFO] [stdout] a3e833e13d16f9ea0ea3e6038c567c3b0a585a2ca7bc1adda61e4c6caec576c5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fde79d55c554957a838065c5623059d65bacd3c4a50c67ccddb79f9081c6ff75
[INFO] running `Command { std: "docker" "start" "-a" "fde79d55c554957a838065c5623059d65bacd3c4a50c67ccddb79f9081c6ff75", kill_on_drop: false }`
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ssd1306.rs:188:21
[INFO] [stdout]     |
[INFO] [stdout] 188 |                 let mut end = pos + find_span_end(&old[pos..], &new[pos..]);
[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] [stderr]    Compiling mono_display v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ssd1306.rs:188:21
[INFO] [stdout]     |
[INFO] [stdout] 188 |                 let mut end = pos + find_span_end(&old[pos..], &new[pos..]);
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `Command { std: "docker" "inspect" "fde79d55c554957a838065c5623059d65bacd3c4a50c67ccddb79f9081c6ff75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fde79d55c554957a838065c5623059d65bacd3c4a50c67ccddb79f9081c6ff75", kill_on_drop: false }`
[INFO] [stdout] fde79d55c554957a838065c5623059d65bacd3c4a50c67ccddb79f9081c6ff75
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7bbbb718babb6f2bcac6a2873f4a2db8a5ee3169187349e9d030e52dcc8fd2b8
[INFO] running `Command { std: "docker" "start" "-a" "7bbbb718babb6f2bcac6a2873f4a2db8a5ee3169187349e9d030e52dcc8fd2b8", kill_on_drop: false }`
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/ssd1306.rs:188:21
[INFO] [stderr]     |
[INFO] [stderr] 188 |                 let mut end = pos + find_span_end(&old[pos..], &new[pos..]);
[INFO] [stderr]     |                     ----^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `mono_display` (lib) generated 1 warning
[INFO] [stderr] warning: `mono_display` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/mono_display-101d4871436231af)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mono_display
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "7bbbb718babb6f2bcac6a2873f4a2db8a5ee3169187349e9d030e52dcc8fd2b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7bbbb718babb6f2bcac6a2873f4a2db8a5ee3169187349e9d030e52dcc8fd2b8", kill_on_drop: false }`
[INFO] [stdout] 7bbbb718babb6f2bcac6a2873f4a2db8a5ee3169187349e9d030e52dcc8fd2b8