[INFO] fetching crate keratin 0.1.7...
[INFO] checking keratin-0.1.7 against try#32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d for pr-83312
[INFO] extracting crate keratin 0.1.7 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate keratin 0.1.7 on toolchain 32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate keratin 0.1.7
[INFO] finished tweaking crates.io crate keratin 0.1.7
[INFO] tweaked toml for crates.io crate keratin 0.1.7 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:4f92631de1aa59f8320307485d3b3c869a5c90ab1d76ce2cffab9807b8c9a1fb" "/opt/rustwide/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 19c2d6e593ddcc4229b241dbe4106ad237269fe0cffb7ed415f5d5684ae307cd
[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" "19c2d6e593ddcc4229b241dbe4106ad237269fe0cffb7ed415f5d5684ae307cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "19c2d6e593ddcc4229b241dbe4106ad237269fe0cffb7ed415f5d5684ae307cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19c2d6e593ddcc4229b241dbe4106ad237269fe0cffb7ed415f5d5684ae307cd", kill_on_drop: false }`
[INFO] [stdout] 19c2d6e593ddcc4229b241dbe4106ad237269fe0cffb7ed415f5d5684ae307cd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:4f92631de1aa59f8320307485d3b3c869a5c90ab1d76ce2cffab9807b8c9a1fb" "/opt/rustwide/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 36bd4a6e9da027386eaf66a0deca92b4b4f9410efe36aa4d66e3ba95f4ca87c8
[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" "36bd4a6e9da027386eaf66a0deca92b4b4f9410efe36aa4d66e3ba95f4ca87c8", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.64
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]     Checking linked-hash-map v0.5.4
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]     Checking md5 v0.7.0
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]    Compiling serde_derive v1.0.125
[INFO] [stderr]     Checking serde v1.0.125
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stderr]     Checking bson v1.2.0
[INFO] [stderr]     Checking keratin v0.1.7 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io::prelude::*`
[INFO] [stdout]  --> src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `BufWriter`
[INFO] [stdout]  --> src/lib.rs:8:15
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io::{BufWriter, Write};
[INFO] [stdout]   |               ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::SeekFrom`
[INFO] [stdout]  --> src/lib.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::io::SeekFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::prelude::*`
[INFO] [stdout]  --> src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `BufWriter`
[INFO] [stdout]  --> src/lib.rs:8:15
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io::{BufWriter, Write};
[INFO] [stdout]   |               ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::SeekFrom`
[INFO] [stdout]  --> src/lib.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::io::SeekFrom;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/lib.rs:182:9
[INFO] [stdout]     |
[INFO] [stdout] 162 | /             return Ok(Collection {
[INFO] [stdout] 163 | |                 main_path,
[INFO] [stdout] 164 | |                 config,
[INFO] [stdout] 165 | |                 //mapped_keys: HashMap::new(),
[INFO] [stdout] 166 | |                 cached_docs: HashMap::new(),
[INFO] [stdout] 167 | |             })
[INFO] [stdout]     | |______________- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 182 |           Err(Errors::DbConfigurationError)
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/lib.rs:182:9
[INFO] [stdout]     |
[INFO] [stdout] 162 | /             return Ok(Collection {
[INFO] [stdout] 163 | |                 main_path,
[INFO] [stdout] 164 | |                 config,
[INFO] [stdout] 165 | |                 //mapped_keys: HashMap::new(),
[INFO] [stdout] 166 | |                 cached_docs: HashMap::new(),
[INFO] [stdout] 167 | |             })
[INFO] [stdout]     | |______________- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 182 |           Err(Errors::DbConfigurationError)
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/lib.rs:126:18
[INFO] [stdout]     |
[INFO] [stdout] 126 |             Some(x) => {
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/lib.rs:126:18
[INFO] [stdout]     |
[INFO] [stdout] 126 |             Some(x) => {
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `keratin::errors::Errors`
[INFO] [stdout]  --> tests/core.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use keratin::errors::Errors;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 27.87s
[INFO] running `Command { std: "docker" "inspect" "36bd4a6e9da027386eaf66a0deca92b4b4f9410efe36aa4d66e3ba95f4ca87c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36bd4a6e9da027386eaf66a0deca92b4b4f9410efe36aa4d66e3ba95f4ca87c8", kill_on_drop: false }`
[INFO] [stdout] 36bd4a6e9da027386eaf66a0deca92b4b4f9410efe36aa4d66e3ba95f4ca87c8