[INFO] crate mono_display 0.1.0 is already in cache
[INFO] extracting crate mono_display 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/mono_display/0.1.0
[INFO] extracting crate mono_display 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mono_display/0.1.0
[INFO] validating manifest of mono_display-0.1.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mono_display-0.1.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mono_display-0.1.0
[INFO] finished frobbing mono_display-0.1.0
[INFO] frobbed toml for mono_display-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/mono_display/0.1.0/Cargo.toml
[INFO] started frobbing mono_display-0.1.0
[INFO] finished frobbing mono_display-0.1.0
[INFO] frobbed toml for mono_display-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mono_display/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing mono_display-0.1.0 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mono_display/0.1.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 3a8179ab167791b638db366b34edea88dcf007ce0d71545f76d560c934d8189e
[INFO] running `"docker" "start" "-a" "3a8179ab167791b638db366b34edea88dcf007ce0d71545f76d560c934d8189e"`
[INFO] [stderr]    Compiling font-rs v0.1.3
[INFO] [stderr]    Compiling bdf v0.5.5
[INFO] [stderr]    Compiling rppal v0.7.1
[INFO] [stderr]    Compiling mono_display v0.1.0 (/opt/crater/workdir)
[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]     Finished dev [unoptimized + debuginfo] target(s) in 4.47s
[INFO] running `"docker" "inspect" "3a8179ab167791b638db366b34edea88dcf007ce0d71545f76d560c934d8189e"`
[INFO] running `"docker" "rm" "-f" "3a8179ab167791b638db366b34edea88dcf007ce0d71545f76d560c934d8189e"`
[INFO] [stdout] 3a8179ab167791b638db366b34edea88dcf007ce0d71545f76d560c934d8189e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mono_display/0.1.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 95db373ba3523950a67f8de523b889ecd11fe888a781733227a327585e31a836
[INFO] running `"docker" "start" "-a" "95db373ba3523950a67f8de523b889ecd11fe888a781733227a327585e31a836"`
[INFO] [stderr]    Compiling mono_display v0.1.0 (/opt/crater/workdir)
[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]     Finished dev [unoptimized + debuginfo] target(s) in 0.76s
[INFO] running `"docker" "inspect" "95db373ba3523950a67f8de523b889ecd11fe888a781733227a327585e31a836"`
[INFO] running `"docker" "rm" "-f" "95db373ba3523950a67f8de523b889ecd11fe888a781733227a327585e31a836"`
[INFO] [stdout] 95db373ba3523950a67f8de523b889ecd11fe888a781733227a327585e31a836
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mono_display/0.1.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 70ab75335f107f05fd64372abaad572e2971075b4256e86ba3c6fe7e61848ea5
[INFO] running `"docker" "start" "-a" "70ab75335f107f05fd64372abaad572e2971075b4256e86ba3c6fe7e61848ea5"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mono_display-fe5c6f18da27f262
[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
[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
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "70ab75335f107f05fd64372abaad572e2971075b4256e86ba3c6fe7e61848ea5"`
[INFO] running `"docker" "rm" "-f" "70ab75335f107f05fd64372abaad572e2971075b4256e86ba3c6fe7e61848ea5"`
[INFO] [stdout] 70ab75335f107f05fd64372abaad572e2971075b4256e86ba3c6fe7e61848ea5