[INFO] cloning repository https://github.com/alicerum/labyrinth
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alicerum/labyrinth" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falicerum%2Flabyrinth", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falicerum%2Flabyrinth'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 35801da87395bae302755ecc40d5f1db46bd9c89
[INFO] checking alicerum/labyrinth against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falicerum%2Flabyrinth" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alicerum/labyrinth 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/alicerum/labyrinth
[INFO] finished tweaking git repo https://github.com/alicerum/labyrinth
[INFO] tweaked toml for git repo https://github.com/alicerum/labyrinth written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/alicerum/labyrinth 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-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 6a08cde0e7520f0c6a662266efbb992cdb07a0d8ed0e3db03c0fa8ec91f70064
[INFO] running `Command { std: "docker" "start" "-a" "6a08cde0e7520f0c6a662266efbb992cdb07a0d8ed0e3db03c0fa8ec91f70064", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6a08cde0e7520f0c6a662266efbb992cdb07a0d8ed0e3db03c0fa8ec91f70064", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a08cde0e7520f0c6a662266efbb992cdb07a0d8ed0e3db03c0fa8ec91f70064", kill_on_drop: false }`
[INFO] [stdout] 6a08cde0e7520f0c6a662266efbb992cdb07a0d8ed0e3db03c0fa8ec91f70064
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 304cf25446117574116af3c03c01c88c002da0f7a30be63d5c7cc22abcceca91
[INFO] running `Command { std: "docker" "start" "-a" "304cf25446117574116af3c03c01c88c002da0f7a30be63d5c7cc22abcceca91", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.105
[INFO] [stderr]    Compiling signal-hook v0.3.10
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stderr]     Checking lock_api v0.4.5
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking mio v0.7.14
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]     Checking signal-hook-mio v0.2.1
[INFO] [stderr]     Checking crossterm v0.22.1
[INFO] [stderr]     Checking labyrinth v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `KeyModifiers`
[INFO] [stdout]  --> src/lib.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 |     event::{KeyCode, KeyEvent, KeyModifiers},
[INFO] [stdout]   |                                ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `KeyModifiers`
[INFO] [stdout]  --> src/lib.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 |     event::{KeyCode, KeyEvent, KeyModifiers},
[INFO] [stdout]   |                                ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tick` is never used
[INFO] [stdout]   --> src/views/mod.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub trait View {
[INFO] [stdout]    |           ---- method in this trait
[INFO] [stdout] 28 |     fn process_key(&mut self, ke: KeyEvent) -> Result<Option<Box<dyn View>>, ViewError>;
[INFO] [stdout] 29 |     fn tick(&mut self);
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tick` is never used
[INFO] [stdout]   --> src/views/mod.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub trait View {
[INFO] [stdout]    |           ---- method in this trait
[INFO] [stdout] 28 |     fn process_key(&mut self, ke: KeyEvent) -> Result<Option<Box<dyn View>>, ViewError>;
[INFO] [stdout] 29 |     fn tick(&mut self);
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.14s
[INFO] running `Command { std: "docker" "inspect" "304cf25446117574116af3c03c01c88c002da0f7a30be63d5c7cc22abcceca91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "304cf25446117574116af3c03c01c88c002da0f7a30be63d5c7cc22abcceca91", kill_on_drop: false }`
[INFO] [stdout] 304cf25446117574116af3c03c01c88c002da0f7a30be63d5c7cc22abcceca91
[INFO] checking alicerum/labyrinth against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falicerum%2Flabyrinth" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alicerum/labyrinth 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/alicerum/labyrinth
[INFO] finished tweaking git repo https://github.com/alicerum/labyrinth
[INFO] tweaked toml for git repo https://github.com/alicerum/labyrinth written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/alicerum/labyrinth 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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 9709ffab36066b213c2c1bf2d2367f93b2df9c74c191b1cb86e79f223510c591
[INFO] running `Command { std: "docker" "start" "-a" "9709ffab36066b213c2c1bf2d2367f93b2df9c74c191b1cb86e79f223510c591", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9709ffab36066b213c2c1bf2d2367f93b2df9c74c191b1cb86e79f223510c591", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9709ffab36066b213c2c1bf2d2367f93b2df9c74c191b1cb86e79f223510c591", kill_on_drop: false }`
[INFO] [stdout] 9709ffab36066b213c2c1bf2d2367f93b2df9c74c191b1cb86e79f223510c591
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 0e77927e08518429b7452b7f84f19af70b8858214dba768b890157db2dd1feff
[INFO] running `Command { std: "docker" "start" "-a" "0e77927e08518429b7452b7f84f19af70b8858214dba768b890157db2dd1feff", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.105
[INFO] [stderr]    Compiling signal-hook v0.3.10
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stderr]     Checking lock_api v0.4.5
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking mio v0.7.14
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]     Checking signal-hook-mio v0.2.1
[INFO] [stderr]     Checking crossterm v0.22.1
[INFO] [stderr]     Checking labyrinth v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `KeyModifiers`
[INFO] [stdout]  --> src/lib.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 |     event::{KeyCode, KeyEvent, KeyModifiers},
[INFO] [stdout]   |                                ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `KeyModifiers`
[INFO] [stdout]  --> src/lib.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 |     event::{KeyCode, KeyEvent, KeyModifiers},
[INFO] [stdout]   |                                ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tick` is never used
[INFO] [stdout]   --> src/views/mod.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub trait View {
[INFO] [stdout]    |           ---- method in this trait
[INFO] [stdout] 28 |     fn process_key(&mut self, ke: KeyEvent) -> Result<Option<Box<dyn View>>, ViewError>;
[INFO] [stdout] 29 |     fn tick(&mut self);
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `tick` is never used
[INFO] [stdout]   --> src/views/mod.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub trait View {
[INFO] [stdout]    |           ---- method in this trait
[INFO] [stdout] 28 |     fn process_key(&mut self, ke: KeyEvent) -> Result<Option<Box<dyn View>>, ViewError>;
[INFO] [stdout] 29 |     fn tick(&mut self);
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.69s
[INFO] running `Command { std: "docker" "inspect" "0e77927e08518429b7452b7f84f19af70b8858214dba768b890157db2dd1feff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e77927e08518429b7452b7f84f19af70b8858214dba768b890157db2dd1feff", kill_on_drop: false }`
[INFO] [stdout] 0e77927e08518429b7452b7f84f19af70b8858214dba768b890157db2dd1feff