[INFO] updating cached repository gregorholzmann/rust-playground
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/gregorholzmann/rust-playground
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/gregorholzmann/rust-playground" "work/ex/beta-1.38-1/sources/1.37.0/gh/gregorholzmann/rust-playground"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/gregorholzmann/rust-playground'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/gregorholzmann/rust-playground" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/gregorholzmann/rust-playground"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/gregorholzmann/rust-playground'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6e44145369c9374ccf0e294cbae2934d301387e2
[INFO] sha for GitHub repo gregorholzmann/rust-playground: 6e44145369c9374ccf0e294cbae2934d301387e2
[INFO] validating manifest of gregorholzmann/rust-playground 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 gregorholzmann/rust-playground 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 gregorholzmann/rust-playground
[INFO] finished frobbing gregorholzmann/rust-playground
[INFO] frobbed toml for gregorholzmann/rust-playground written to work/ex/beta-1.38-1/sources/1.37.0/gh/gregorholzmann/rust-playground/Cargo.toml
[INFO] started frobbing gregorholzmann/rust-playground
[INFO] finished frobbing gregorholzmann/rust-playground
[INFO] frobbed toml for gregorholzmann/rust-playground written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/gregorholzmann/rust-playground/Cargo.toml
[INFO] crate gregorholzmann/rust-playground 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 gregorholzmann/rust-playground 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-2/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/gregorholzmann/rust-playground:/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] f853e4e53a80a77917eb5af5cf6e1f52bfec9e30c1d3af806e79c8a8abce7efe
[INFO] running `"docker" "start" "-a" "f853e4e53a80a77917eb5af5cf6e1f52bfec9e30c1d3af806e79c8a8abce7efe"`
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/main.rs:86:9
[INFO] [stderr]    |
[INFO] [stderr] 86 |     for x in 0..number_of_cards {
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `num_value` is never read
[INFO] [stderr]   --> src/main.rs:25:21
[INFO] [stderr]    |
[INFO] [stderr] 25 |             let mut num_value: u8 = 0;
[INFO] [stderr]    |                     ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:101:51
[INFO] [stderr]     |
[INFO] [stderr] 101 | fn end_game(player_hand: Hand, dealer_hand: Hand, mut deck: &mut Vec<Card>) {
[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 3.51s
[INFO] running `"docker" "inspect" "f853e4e53a80a77917eb5af5cf6e1f52bfec9e30c1d3af806e79c8a8abce7efe"`
[INFO] running `"docker" "rm" "-f" "f853e4e53a80a77917eb5af5cf6e1f52bfec9e30c1d3af806e79c8a8abce7efe"`
[INFO] [stdout] f853e4e53a80a77917eb5af5cf6e1f52bfec9e30c1d3af806e79c8a8abce7efe
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/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/gregorholzmann/rust-playground:/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] 7c07d74702e46c2242971a46c79c439eac637ae99ab821b27e20819d26ef72cd
[INFO] running `"docker" "start" "-a" "7c07d74702e46c2242971a46c79c439eac637ae99ab821b27e20819d26ef72cd"`
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/main.rs:86:9
[INFO] [stderr]    |
[INFO] [stderr] 86 |     for x in 0..number_of_cards {
[INFO] [stderr]    |         ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `num_value` is never read
[INFO] [stderr]   --> src/main.rs:25:21
[INFO] [stderr]    |
[INFO] [stderr] 25 |             let mut num_value: u8 = 0;
[INFO] [stderr]    |                     ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:101:51
[INFO] [stderr]     |
[INFO] [stderr] 101 | fn end_game(player_hand: Hand, dealer_hand: Hand, mut deck: &mut Vec<Card>) {
[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 0.87s
[INFO] running `"docker" "inspect" "7c07d74702e46c2242971a46c79c439eac637ae99ab821b27e20819d26ef72cd"`
[INFO] running `"docker" "rm" "-f" "7c07d74702e46c2242971a46c79c439eac637ae99ab821b27e20819d26ef72cd"`
[INFO] [stdout] 7c07d74702e46c2242971a46c79c439eac637ae99ab821b27e20819d26ef72cd
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/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/gregorholzmann/rust-playground:/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] 57b2999f13575b6941961c7cfc1bd95d619d7d48544b3f1f354b388f33607cfa
[INFO] running `"docker" "start" "-a" "57b2999f13575b6941961c7cfc1bd95d619d7d48544b3f1f354b388f33607cfa"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_playground-4541b789023d325f
[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" "57b2999f13575b6941961c7cfc1bd95d619d7d48544b3f1f354b388f33607cfa"`
[INFO] running `"docker" "rm" "-f" "57b2999f13575b6941961c7cfc1bd95d619d7d48544b3f1f354b388f33607cfa"`
[INFO] [stdout] 57b2999f13575b6941961c7cfc1bd95d619d7d48544b3f1f354b388f33607cfa