[INFO] cloning repository https://github.com/alex-griffiths/ai_romania
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alex-griffiths/ai_romania" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falex-griffiths%2Fai_romania", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falex-griffiths%2Fai_romania'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2391356c1e35d3036e476fed794821d41358a06f
[INFO] checking alex-griffiths/ai_romania against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falex-griffiths%2Fai_romania" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alex-griffiths/ai_romania on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/alex-griffiths/ai_romania
[INFO] finished tweaking git repo https://github.com/alex-griffiths/ai_romania
[INFO] tweaked toml for git repo https://github.com/alex-griffiths/ai_romania written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/alex-griffiths/ai_romania already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1de1e18b9027f730ebfdbcf56f3854bc03de2689fb6f9e621cb88678c664a7f1
[INFO] running `Command { std: "docker" "start" "-a" "1de1e18b9027f730ebfdbcf56f3854bc03de2689fb6f9e621cb88678c664a7f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1de1e18b9027f730ebfdbcf56f3854bc03de2689fb6f9e621cb88678c664a7f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1de1e18b9027f730ebfdbcf56f3854bc03de2689fb6f9e621cb88678c664a7f1", kill_on_drop: false }`
[INFO] [stdout] 1de1e18b9027f730ebfdbcf56f3854bc03de2689fb6f9e621cb88678c664a7f1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8198ad0ed46ca77d9124d2a8d5cfbca7643989bea7bea4aa131f4a6761ebc978
[INFO] running `Command { std: "docker" "start" "-a" "8198ad0ed46ca77d9124d2a8d5cfbca7643989bea7bea4aa131f4a6761ebc978", kill_on_drop: false }`
[INFO] [stderr]     Checking romania v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Walker`
[INFO] [stdout]  --> src/main.rs:5:31
[INFO] [stdout]   |
[INFO] [stdout] 5 | use graph::{Graph, NodeIndex, Walker};
[INFO] [stdout]   |                               ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Walker`
[INFO] [stdout]  --> src/main.rs:5:31
[INFO] [stdout]   |
[INFO] [stdout] 5 | use graph::{Graph, NodeIndex, Walker};
[INFO] [stdout]   |                               ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `walker` is never used
[INFO] [stdout]   --> src/graph.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl Graph {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 74 |     pub fn walker(&self, source: NodeIndex) -> Walker {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/graph.rs:92:12
[INFO] [stdout]    |
[INFO] [stdout] 91 | impl<'graph> Walker<'graph> {
[INFO] [stdout]    | --------------------------- associated function in this implementation
[INFO] [stdout] 92 |     pub fn new(start_idx: NodeIndex, graph: &Graph) -> Walker {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `walker` is never used
[INFO] [stdout]   --> src/graph.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl Graph {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 74 |     pub fn walker(&self, source: NodeIndex) -> Walker {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/graph.rs:92:12
[INFO] [stdout]    |
[INFO] [stdout] 91 | impl<'graph> Walker<'graph> {
[INFO] [stdout]    | --------------------------- associated function in this implementation
[INFO] [stdout] 92 |     pub fn new(start_idx: NodeIndex, graph: &Graph) -> Walker {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "8198ad0ed46ca77d9124d2a8d5cfbca7643989bea7bea4aa131f4a6761ebc978", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8198ad0ed46ca77d9124d2a8d5cfbca7643989bea7bea4aa131f4a6761ebc978", kill_on_drop: false }`
[INFO] [stdout] 8198ad0ed46ca77d9124d2a8d5cfbca7643989bea7bea4aa131f4a6761ebc978
[INFO] checking alex-griffiths/ai_romania against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falex-griffiths%2Fai_romania" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alex-griffiths/ai_romania on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/alex-griffiths/ai_romania
[INFO] finished tweaking git repo https://github.com/alex-griffiths/ai_romania
[INFO] tweaked toml for git repo https://github.com/alex-griffiths/ai_romania written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/alex-griffiths/ai_romania already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 70c97a7ff7965322c085a1c191ca4d15f48c487170a661244828ee97bd56f9bc
[INFO] running `Command { std: "docker" "start" "-a" "70c97a7ff7965322c085a1c191ca4d15f48c487170a661244828ee97bd56f9bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "70c97a7ff7965322c085a1c191ca4d15f48c487170a661244828ee97bd56f9bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "70c97a7ff7965322c085a1c191ca4d15f48c487170a661244828ee97bd56f9bc", kill_on_drop: false }`
[INFO] [stdout] 70c97a7ff7965322c085a1c191ca4d15f48c487170a661244828ee97bd56f9bc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a13fb70a57da4ad6c3bd4afb47357691e1c83532d603005a218cdd85b5261fe1
[INFO] running `Command { std: "docker" "start" "-a" "a13fb70a57da4ad6c3bd4afb47357691e1c83532d603005a218cdd85b5261fe1", kill_on_drop: false }`
[INFO] [stderr]     Checking romania v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Walker`
[INFO] [stdout]  --> src/main.rs:5:31
[INFO] [stdout]   |
[INFO] [stdout] 5 | use graph::{Graph, NodeIndex, Walker};
[INFO] [stdout]   |                               ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Walker`
[INFO] [stdout]  --> src/main.rs:5:31
[INFO] [stdout]   |
[INFO] [stdout] 5 | use graph::{Graph, NodeIndex, Walker};
[INFO] [stdout]   |                               ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `walker` is never used
[INFO] [stdout]   --> src/graph.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl Graph {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 74 |     pub fn walker(&self, source: NodeIndex) -> Walker {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/graph.rs:92:12
[INFO] [stdout]    |
[INFO] [stdout] 91 | impl<'graph> Walker<'graph> {
[INFO] [stdout]    | --------------------------- associated function in this implementation
[INFO] [stdout] 92 |     pub fn new(start_idx: NodeIndex, graph: &Graph) -> Walker {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `walker` is never used
[INFO] [stdout]   --> src/graph.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | impl Graph {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 74 |     pub fn walker(&self, source: NodeIndex) -> Walker {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/graph.rs:92:12
[INFO] [stdout]    |
[INFO] [stdout] 91 | impl<'graph> Walker<'graph> {
[INFO] [stdout]    | --------------------------- associated function in this implementation
[INFO] [stdout] 92 |     pub fn new(start_idx: NodeIndex, graph: &Graph) -> Walker {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "a13fb70a57da4ad6c3bd4afb47357691e1c83532d603005a218cdd85b5261fe1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a13fb70a57da4ad6c3bd4afb47357691e1c83532d603005a218cdd85b5261fe1", kill_on_drop: false }`
[INFO] [stdout] a13fb70a57da4ad6c3bd4afb47357691e1c83532d603005a218cdd85b5261fe1