[INFO] updating cached repository kbacha/json_serde_test
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kbacha/json_serde_test
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kbacha/json_serde_test" "work/ex/beta-1.38-1/sources/1.37.0/gh/kbacha/json_serde_test"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/kbacha/json_serde_test'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kbacha/json_serde_test" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kbacha/json_serde_test"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kbacha/json_serde_test'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fdbefc044060f4fbe9d75ab46d8e1d90d6d94707
[INFO] sha for GitHub repo kbacha/json_serde_test: fdbefc044060f4fbe9d75ab46d8e1d90d6d94707
[INFO] validating manifest of kbacha/json_serde_test 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 kbacha/json_serde_test 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 kbacha/json_serde_test
[INFO] finished frobbing kbacha/json_serde_test
[INFO] frobbed toml for kbacha/json_serde_test written to work/ex/beta-1.38-1/sources/1.37.0/gh/kbacha/json_serde_test/Cargo.toml
[INFO] started frobbing kbacha/json_serde_test
[INFO] finished frobbing kbacha/json_serde_test
[INFO] frobbed toml for kbacha/json_serde_test written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kbacha/json_serde_test/Cargo.toml
[INFO] crate kbacha/json_serde_test 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing kbacha/json_serde_test against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kbacha/json_serde_test:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 07c64503b426f2aa65cef8172d31dc1dfe75e0bb22b507d9c5d6af01035e1a06
[INFO] running `"docker" "start" "-a" "07c64503b426f2aa65cef8172d31dc1dfe75e0bb22b507d9c5d6af01035e1a06"`
[INFO] [stderr]    Compiling json_testing v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `Read`
[INFO] [stderr]  --> src/main.rs:7:21
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::io::{self, Read};
[INFO] [stderr]   |                     ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.46s
[INFO] running `"docker" "inspect" "07c64503b426f2aa65cef8172d31dc1dfe75e0bb22b507d9c5d6af01035e1a06"`
[INFO] running `"docker" "rm" "-f" "07c64503b426f2aa65cef8172d31dc1dfe75e0bb22b507d9c5d6af01035e1a06"`
[INFO] [stdout] 07c64503b426f2aa65cef8172d31dc1dfe75e0bb22b507d9c5d6af01035e1a06
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kbacha/json_serde_test:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] c2e08d13a69cd852333811fe853222e21c95182e67e13029a49b0ef821461f97
[INFO] running `"docker" "start" "-a" "c2e08d13a69cd852333811fe853222e21c95182e67e13029a49b0ef821461f97"`
[INFO] [stderr]    Compiling json_testing v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `Read`
[INFO] [stderr]  --> src/main.rs:7:21
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::io::{self, Read};
[INFO] [stderr]   |                     ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.89s
[INFO] running `"docker" "inspect" "c2e08d13a69cd852333811fe853222e21c95182e67e13029a49b0ef821461f97"`
[INFO] running `"docker" "rm" "-f" "c2e08d13a69cd852333811fe853222e21c95182e67e13029a49b0ef821461f97"`
[INFO] [stdout] c2e08d13a69cd852333811fe853222e21c95182e67e13029a49b0ef821461f97
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kbacha/json_serde_test:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] ca31f73a306dcfbe4e3f5f046481263aad1e29df90b26928b92ed78c5d6a1328
[INFO] running `"docker" "start" "-a" "ca31f73a306dcfbe4e3f5f046481263aad1e29df90b26928b92ed78c5d6a1328"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[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]      Running /opt/crater/target/debug/deps/json_testing-084a72d36daa19db
[INFO] running `"docker" "inspect" "ca31f73a306dcfbe4e3f5f046481263aad1e29df90b26928b92ed78c5d6a1328"`
[INFO] running `"docker" "rm" "-f" "ca31f73a306dcfbe4e3f5f046481263aad1e29df90b26928b92ed78c5d6a1328"`
[INFO] [stdout] ca31f73a306dcfbe4e3f5f046481263aad1e29df90b26928b92ed78c5d6a1328