[INFO] updating cached repository modeverv/RustbookSec4_201906
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/modeverv/RustbookSec4_201906
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/modeverv/RustbookSec4_201906" "work/ex/beta-1.38-1/sources/1.37.0/gh/modeverv/RustbookSec4_201906"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/modeverv/RustbookSec4_201906'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/modeverv/RustbookSec4_201906" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/modeverv/RustbookSec4_201906"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/modeverv/RustbookSec4_201906'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4c4cf876a2d0a808d20003f16a818707ce9c1608
[INFO] sha for GitHub repo modeverv/RustbookSec4_201906: 4c4cf876a2d0a808d20003f16a818707ce9c1608
[INFO] validating manifest of modeverv/RustbookSec4_201906 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 modeverv/RustbookSec4_201906 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 modeverv/RustbookSec4_201906
[INFO] finished frobbing modeverv/RustbookSec4_201906
[INFO] frobbed toml for modeverv/RustbookSec4_201906 written to work/ex/beta-1.38-1/sources/1.37.0/gh/modeverv/RustbookSec4_201906/Cargo.toml
[INFO] started frobbing modeverv/RustbookSec4_201906
[INFO] finished frobbing modeverv/RustbookSec4_201906
[INFO] frobbed toml for modeverv/RustbookSec4_201906 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/modeverv/RustbookSec4_201906/Cargo.toml
[INFO] crate modeverv/RustbookSec4_201906 already has a lockfile, it will not be regenerated
[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 modeverv/RustbookSec4_201906 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-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/modeverv/RustbookSec4_201906:/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] 510d6b534a59bcb8b8a743f621c4c3c8ba7d3e6148af940b175d591e694ce347
[INFO] running `"docker" "start" "-a" "510d6b534a59bcb8b8a743f621c4c3c8ba7d3e6148af940b175d591e694ce347"`
[INFO] [stderr]    Compiling sec4 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]  --> src/main.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let n = 42;
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_n`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]  --> src/main.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let c = 'R';
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b2`
[INFO] [stderr]  --> src/main.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let b2 = !b1;
[INFO] [stderr]   |         ^^ help: consider prefixing with an underscore: `_b2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n1_ptr`
[INFO] [stderr]   --> src/main.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |     let n1_ptr = &n1;
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_n1_ptr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n2_ptr_mut`
[INFO] [stderr]   --> src/main.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let n2_ptr_mut = &mut n2;
[INFO] [stderr]    |         ^^^^^^^^^^ help: consider prefixing with an underscore: `_n2_ptr_mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let mut o1 = Some(10);
[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: field is never used: `stroke_width`
[INFO] [stderr]   --> src/main.rs:51:5
[INFO] [stderr]    |
[INFO] [stderr] 51 |     stroke_width: u8,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `fill`
[INFO] [stderr]   --> src/main.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     fill: (u8,u8,u8)
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.82s
[INFO] running `"docker" "inspect" "510d6b534a59bcb8b8a743f621c4c3c8ba7d3e6148af940b175d591e694ce347"`
[INFO] running `"docker" "rm" "-f" "510d6b534a59bcb8b8a743f621c4c3c8ba7d3e6148af940b175d591e694ce347"`
[INFO] [stdout] 510d6b534a59bcb8b8a743f621c4c3c8ba7d3e6148af940b175d591e694ce347
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/modeverv/RustbookSec4_201906:/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] 698da5449b69a395c6a482671f488a566e457712e70601989c8456a5dbf19335
[INFO] running `"docker" "start" "-a" "698da5449b69a395c6a482671f488a566e457712e70601989c8456a5dbf19335"`
[INFO] [stderr]    Compiling sec4 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]  --> src/main.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let n = 42;
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_n`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]  --> src/main.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let c = 'R';
[INFO] [stderr]   |         ^ help: consider prefixing with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b2`
[INFO] [stderr]  --> src/main.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let b2 = !b1;
[INFO] [stderr]   |         ^^ help: consider prefixing with an underscore: `_b2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n1_ptr`
[INFO] [stderr]   --> src/main.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |     let n1_ptr = &n1;
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_n1_ptr`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n2_ptr_mut`
[INFO] [stderr]   --> src/main.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let n2_ptr_mut = &mut n2;
[INFO] [stderr]    |         ^^^^^^^^^^ help: consider prefixing with an underscore: `_n2_ptr_mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let mut o1 = Some(10);
[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: field is never used: `stroke_width`
[INFO] [stderr]   --> src/main.rs:51:5
[INFO] [stderr]    |
[INFO] [stderr] 51 |     stroke_width: u8,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `fill`
[INFO] [stderr]   --> src/main.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     fill: (u8,u8,u8)
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.52s
[INFO] running `"docker" "inspect" "698da5449b69a395c6a482671f488a566e457712e70601989c8456a5dbf19335"`
[INFO] running `"docker" "rm" "-f" "698da5449b69a395c6a482671f488a566e457712e70601989c8456a5dbf19335"`
[INFO] [stdout] 698da5449b69a395c6a482671f488a566e457712e70601989c8456a5dbf19335
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/modeverv/RustbookSec4_201906:/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] f95a1b811862df70d416521cc1774065f9ad3e8febe3fe2b042d316f784b7d3f
[INFO] running `"docker" "start" "-a" "f95a1b811862df70d416521cc1774065f9ad3e8febe3fe2b042d316f784b7d3f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/sec4-e517e4b873de3cc5
[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" "f95a1b811862df70d416521cc1774065f9ad3e8febe3fe2b042d316f784b7d3f"`
[INFO] running `"docker" "rm" "-f" "f95a1b811862df70d416521cc1774065f9ad3e8febe3fe2b042d316f784b7d3f"`
[INFO] [stdout] f95a1b811862df70d416521cc1774065f9ad3e8febe3fe2b042d316f784b7d3f