[INFO] cloning repository https://github.com/zhangsoledad/lmdb_test
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zhangsoledad/lmdb_test" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhangsoledad%2Flmdb_test", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhangsoledad%2Flmdb_test'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8269d7b73a989da8ccdcbebb734cd51f372b037f
[INFO] checking zhangsoledad/lmdb_test against try#45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4 for pr-83744
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhangsoledad%2Flmdb_test" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zhangsoledad/lmdb_test on toolchain 45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zhangsoledad/lmdb_test
[INFO] finished tweaking git repo https://github.com/zhangsoledad/lmdb_test
[INFO] tweaked toml for git repo https://github.com/zhangsoledad/lmdb_test written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/zhangsoledad/lmdb_test already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded lmdb v0.7.1
[INFO] [stderr]   Downloaded lmdb-sys v0.7.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8f38a8a8a0dae4c84ff3eff1c085f5c06e4943a304edcfeb2436277c0ab12bfd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8f38a8a8a0dae4c84ff3eff1c085f5c06e4943a304edcfeb2436277c0ab12bfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f38a8a8a0dae4c84ff3eff1c085f5c06e4943a304edcfeb2436277c0ab12bfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f38a8a8a0dae4c84ff3eff1c085f5c06e4943a304edcfeb2436277c0ab12bfd", kill_on_drop: false }`
[INFO] [stdout] 8f38a8a8a0dae4c84ff3eff1c085f5c06e4943a304edcfeb2436277c0ab12bfd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=forbid" "-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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b4a3b998ace67edb54f2b84699f5d851404f2e82c4f1189caefc30e1d3056cfe
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b4a3b998ace67edb54f2b84699f5d851404f2e82c4f1189caefc30e1d3056cfe", kill_on_drop: false }`
[INFO] [stderr]    Compiling gcc v0.3.53
[INFO] [stderr]     Checking scopeguard v0.3.2
[INFO] [stderr]     Checking either v1.1.0
[INFO] [stderr]    Compiling rayon-core v1.2.1
[INFO] [stderr]     Checking futures v0.1.15
[INFO] [stderr]     Checking lazy_static v0.2.8
[INFO] [stderr]     Checking num-traits v0.1.40
[INFO] [stderr]     Checking serde v1.0.11
[INFO] [stderr]     Checking byteorder v1.1.0
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking tempdir v0.3.5
[INFO] [stderr]     Checking coco v0.1.1
[INFO] [stderr]    Compiling lmdb-sys v0.7.1
[INFO] [stderr]    Compiling serde_derive_internals v0.15.1
[INFO] [stderr]     Checking rayon v0.8.2
[INFO] [stderr]    Compiling serde_derive v1.0.11
[INFO] [stderr]     Checking lmdb v0.7.1
[INFO] [stderr]     Checking bincode v0.8.0
[INFO] [stderr]     Checking lmdb_test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Cursor`
[INFO] [stdout]  --> src/lmdb.rs:3:14
[INFO] [stdout]   |
[INFO] [stdout] 3 | use libmdb::{Cursor, Database, DatabaseFlags, Environment, Transaction, WriteFlags};
[INFO] [stdout]   |              ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rayon::prelude`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use rayon::prelude::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Cursor`
[INFO] [stdout]  --> src/lmdb.rs:3:14
[INFO] [stdout]   |
[INFO] [stdout] 3 | use libmdb::{Cursor, Database, DatabaseFlags, Environment, Transaction, WriteFlags};
[INFO] [stdout]   |              ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rayon::prelude`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use rayon::prelude::*;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     db.clear();
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stdout]   --> src/main.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | /     height
[INFO] [stdout] 23 | |         .iter()
[INFO] [stdout] 24 | |         .map(|height| { db.save_height(*height); })
[INFO] [stdout] 25 | |         .collect::<Vec<()>>();
[INFO] [stdout]    | |______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:24:25
[INFO] [stdout]    |
[INFO] [stdout] 24 |         .map(|height| { db.save_height(*height); })
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `height_key` should have an upper case name
[INFO] [stdout]  --> src/lmdb.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 | const height_key: [u8; 1] = [104];
[INFO] [stdout]   |       ^^^^^^^^^^ help: convert the identifier to upper case: `HEIGHT_KEY`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `head_key` should have an upper case name
[INFO] [stdout]  --> src/lmdb.rs:7:7
[INFO] [stdout]   |
[INFO] [stdout] 7 | const head_key: [u8; 1] = [105];
[INFO] [stdout]   |       ^^^^^^^^ help: convert the identifier to upper case: `HEAD_KEY`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `tail_key` should have an upper case name
[INFO] [stdout]  --> src/lmdb.rs:8:7
[INFO] [stdout]   |
[INFO] [stdout] 8 | const tail_key: [u8; 1] = [116];
[INFO] [stdout]   |       ^^^^^^^^ help: convert the identifier to upper case: `TAIL_KEY`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     db.clear();
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stdout]   --> src/main.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 | /     height
[INFO] [stdout] 23 | |         .iter()
[INFO] [stdout] 24 | |         .map(|height| { db.save_height(*height); })
[INFO] [stdout] 25 | |         .collect::<Vec<()>>();
[INFO] [stdout]    | |______________________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:24:25
[INFO] [stdout]    |
[INFO] [stdout] 24 |         .map(|height| { db.save_height(*height); })
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `height_key` should have an upper case name
[INFO] [stdout]  --> src/lmdb.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 | const height_key: [u8; 1] = [104];
[INFO] [stdout]   |       ^^^^^^^^^^ help: convert the identifier to upper case: `HEIGHT_KEY`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `head_key` should have an upper case name
[INFO] [stdout]  --> src/lmdb.rs:7:7
[INFO] [stdout]   |
[INFO] [stdout] 7 | const head_key: [u8; 1] = [105];
[INFO] [stdout]   |       ^^^^^^^^ help: convert the identifier to upper case: `HEAD_KEY`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `tail_key` should have an upper case name
[INFO] [stdout]  --> src/lmdb.rs:8:7
[INFO] [stdout]   |
[INFO] [stdout] 8 | const tail_key: [u8; 1] = [116];
[INFO] [stdout]   |       ^^^^^^^^ help: convert the identifier to upper case: `TAIL_KEY`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.32s
[INFO] running `Command { std: "docker" "inspect" "b4a3b998ace67edb54f2b84699f5d851404f2e82c4f1189caefc30e1d3056cfe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4a3b998ace67edb54f2b84699f5d851404f2e82c4f1189caefc30e1d3056cfe", kill_on_drop: false }`
[INFO] [stdout] b4a3b998ace67edb54f2b84699f5d851404f2e82c4f1189caefc30e1d3056cfe