[INFO] cloning repository https://github.com/danvk/rusty-boggle
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/danvk/rusty-boggle" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanvk%2Frusty-boggle", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanvk%2Frusty-boggle'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 47f91bf1d06ff9abf743daac1a7dcebd4bdd226e
[INFO] checking danvk/rusty-boggle against master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanvk%2Frusty-boggle" "/workspace/builds/worker-71/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-71/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/danvk/rusty-boggle on toolchain db1fb85cff63ad5fffe435e17128f99f9e1d970c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/danvk/rusty-boggle
[INFO] finished tweaking git repo https://github.com/danvk/rusty-boggle
[INFO] tweaked toml for git repo https://github.com/danvk/rusty-boggle written to /workspace/builds/worker-71/source/Cargo.toml
[INFO] crate git repo https://github.com/danvk/rusty-boggle already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d3c90f80c6d8353afa4154f22fefbc649c1a0af3ca331a682ac783ac6cf048c2
[INFO] running `Command { std: "docker" "start" "-a" "d3c90f80c6d8353afa4154f22fefbc649c1a0af3ca331a682ac783ac6cf048c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d3c90f80c6d8353afa4154f22fefbc649c1a0af3ca331a682ac783ac6cf048c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3c90f80c6d8353afa4154f22fefbc649c1a0af3ca331a682ac783ac6cf048c2", kill_on_drop: false }`
[INFO] [stdout] d3c90f80c6d8353afa4154f22fefbc649c1a0af3ca331a682ac783ac6cf048c2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-71/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9ff5749c82c6c512020a03552eedad8e5386e4683ae9aa092029e77b9ba35bbf
[INFO] running `Command { std: "docker" "start" "-a" "9ff5749c82c6c512020a03552eedad8e5386e4683ae9aa092029e77b9ba35bbf", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rusty-boggle v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: panic message contains an unused formatting placeholder
[INFO] [stdout]   --> src/trie.rs:73:45
[INFO] [stdout]    |
[INFO] [stdout] 73 |             None => panic!("Invalid letter: {i}"),
[INFO] [stdout]    |                                             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout]    = note: this message is not used as a format string when given without arguments, but will be in Rust 2021
[INFO] [stdout] help: add the missing argument
[INFO] [stdout]    |
[INFO] [stdout] 73 |             None => panic!("Invalid letter: {i}", ...),
[INFO] [stdout]    |                                                 +++++
[INFO] [stdout] help: or add a "{}" format string to use the message literally
[INFO] [stdout]    |
[INFO] [stdout] 73 |             None => panic!("{}", "Invalid letter: {i}"),
[INFO] [stdout]    |                            +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains an unused formatting placeholder
[INFO] [stdout]   --> src/trie.rs:85:45
[INFO] [stdout]    |
[INFO] [stdout] 85 |             None => panic!("Invalid letter: {i}"),
[INFO] [stdout]    |                                             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this message is not used as a format string when given without arguments, but will be in Rust 2021
[INFO] [stdout] help: add the missing argument
[INFO] [stdout]    |
[INFO] [stdout] 85 |             None => panic!("Invalid letter: {i}", ...),
[INFO] [stdout]    |                                                 +++++
[INFO] [stdout] help: or add a "{}" format string to use the message literally
[INFO] [stdout]    |
[INFO] [stdout] 85 |             None => panic!("{}", "Invalid letter: {i}"),
[INFO] [stdout]    |                            +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains an unused formatting placeholder
[INFO] [stdout]   --> src/trie.rs:73:45
[INFO] [stdout]    |
[INFO] [stdout] 73 |             None => panic!("Invalid letter: {i}"),
[INFO] [stdout]    |                                             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panics)]` on by default
[INFO] [stdout]    = note: this message is not used as a format string when given without arguments, but will be in Rust 2021
[INFO] [stdout] help: add the missing argument
[INFO] [stdout]    |
[INFO] [stdout] 73 |             None => panic!("Invalid letter: {i}", ...),
[INFO] [stdout]    |                                                 +++++
[INFO] [stdout] help: or add a "{}" format string to use the message literally
[INFO] [stdout]    |
[INFO] [stdout] 73 |             None => panic!("{}", "Invalid letter: {i}"),
[INFO] [stdout]    |                            +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message contains an unused formatting placeholder
[INFO] [stdout]   --> src/trie.rs:85:45
[INFO] [stdout]    |
[INFO] [stdout] 85 |             None => panic!("Invalid letter: {i}"),
[INFO] [stdout]    |                                             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this message is not used as a format string when given without arguments, but will be in Rust 2021
[INFO] [stdout] help: add the missing argument
[INFO] [stdout]    |
[INFO] [stdout] 85 |             None => panic!("Invalid letter: {i}", ...),
[INFO] [stdout]    |                                                 +++++
[INFO] [stdout] help: or add a "{}" format string to use the message literally
[INFO] [stdout]    |
[INFO] [stdout] 85 |             None => panic!("{}", "Invalid letter: {i}"),
[INFO] [stdout]    |                            +++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 30.08s
[INFO] running `Command { std: "docker" "inspect" "9ff5749c82c6c512020a03552eedad8e5386e4683ae9aa092029e77b9ba35bbf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ff5749c82c6c512020a03552eedad8e5386e4683ae9aa092029e77b9ba35bbf", kill_on_drop: false }`
[INFO] [stdout] 9ff5749c82c6c512020a03552eedad8e5386e4683ae9aa092029e77b9ba35bbf