[INFO] cloning repository https://github.com/Pluriscient/Rust-Katas
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Pluriscient/Rust-Katas" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPluriscient%2FRust-Katas", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPluriscient%2FRust-Katas'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 88f36812509ae3ec8a88a3571eef05787a73b139
[INFO] checking Pluriscient/Rust-Katas against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPluriscient%2FRust-Katas" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Pluriscient/Rust-Katas
[INFO] finished tweaking git repo https://github.com/Pluriscient/Rust-Katas
[INFO] tweaked toml for git repo https://github.com/Pluriscient/Rust-Katas written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Pluriscient/Rust-Katas on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Pluriscient/Rust-Katas 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e881c7640c49d8e1b812de9133ac00a6f2cf7d6e77cb92da2227d25ac82e35ce
[INFO] running `Command { std: "docker" "start" "-a" "e881c7640c49d8e1b812de9133ac00a6f2cf7d6e77cb92da2227d25ac82e35ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e881c7640c49d8e1b812de9133ac00a6f2cf7d6e77cb92da2227d25ac82e35ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e881c7640c49d8e1b812de9133ac00a6f2cf7d6e77cb92da2227d25ac82e35ce", kill_on_drop: false }`
[INFO] [stdout] e881c7640c49d8e1b812de9133ac00a6f2cf7d6e77cb92da2227d25ac82e35ce
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 154a9186ded6ec090043dd4cf6567a79ee1dcec8a8705fe66d21d4a4fc659df3
[INFO] running `Command { std: "docker" "start" "-a" "154a9186ded6ec090043dd4cf6567a79ee1dcec8a8705fe66d21d4a4fc659df3", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking number_prefix v0.3.0
[INFO] [stderr]     Checking bit-vec v0.6.2
[INFO] [stderr]     Checking terminal_size v0.1.13
[INFO] [stderr]     Checking termios v0.3.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking console v0.12.0
[INFO] [stderr]     Checking indicatif v0.15.0
[INFO] [stderr]     Checking rust_katas v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> src/probs/four_kyus/morse_advanced.rs:107:9
[INFO] [stdout]     |
[INFO] [stdout] 107 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ptr::null`
[INFO] [stdout]  --> src/probs/three_kyus/algebraic_factors.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::ptr::null;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ptr::null`
[INFO] [stdout]  --> src/probs/three_kyus/algebraic_factors.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::ptr::null;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<()>, Void>
[INFO] [stdout]    --> src/probs/three_kyus/algebraic_factors.rs:141:43
[INFO] [stdout]     |
[INFO] [stdout] 141 |           Box::new(|l: Result<Vec<()>, ()>| match l {
[INFO] [stdout]     |  ___________________________________________^
[INFO] [stdout] 142 | |             Ok(l_content) => Ok(l_content),
[INFO] [stdout] 143 | |             Err(()) => unreachable!(),
[INFO] [stdout] 144 | |         });
[INFO] [stdout]     | |_________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<()>, Void>
[INFO] [stdout]    --> src/probs/three_kyus/algebraic_factors.rs:142:30
[INFO] [stdout]     |
[INFO] [stdout] 142 |             Ok(l_content) => Ok(l_content),
[INFO] [stdout]     |                              ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<()>, Void>
[INFO] [stdout]    --> src/probs/three_kyus/algebraic_factors.rs:146:51
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Box::new(|r: Result<Vec<()>, Void>| match r {
[INFO] [stdout]     |                                                   ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_katas` (bin "rust_katas") due to 3 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/probs/magnet_boxes.rs:24:13
[INFO] [stdout]    |
[INFO] [stdout] 24 | /             format!(
[INFO] [stdout] 25 | |                 "Expected value must be near: {:e} but was:{:e}",
[INFO] [stdout] 26 | |                 expected, actual
[INFO] [stdout] 27 | |             )
[INFO] [stdout]    | |_____________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout]    = note: `#[warn(non_fmt_panics)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 24 ~             
[INFO] [stdout] 25 |                 "Expected value must be near: {:e} but was:{:e}",
[INFO] [stdout] 26 |                 expected, actual
[INFO] [stdout] 27 ~             
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<()>, Void>
[INFO] [stdout]    --> src/probs/three_kyus/algebraic_factors.rs:141:43
[INFO] [stdout]     |
[INFO] [stdout] 141 |           Box::new(|l: Result<Vec<()>, ()>| match l {
[INFO] [stdout]     |  ___________________________________________^
[INFO] [stdout] 142 | |             Ok(l_content) => Ok(l_content),
[INFO] [stdout] 143 | |             Err(()) => unreachable!(),
[INFO] [stdout] 144 | |         });
[INFO] [stdout]     | |_________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<()>, Void>
[INFO] [stdout]    --> src/probs/three_kyus/algebraic_factors.rs:142:30
[INFO] [stdout]     |
[INFO] [stdout] 142 |             Ok(l_content) => Ok(l_content),
[INFO] [stdout]     |                              ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Vec<()>, Void>
[INFO] [stdout]    --> src/probs/three_kyus/algebraic_factors.rs:146:51
[INFO] [stdout]     |
[INFO] [stdout] 146 |         Box::new(|r: Result<Vec<()>, Void>| match r {
[INFO] [stdout]     |                                                   ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_katas` (bin "rust_katas" test) due to 3 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "154a9186ded6ec090043dd4cf6567a79ee1dcec8a8705fe66d21d4a4fc659df3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "154a9186ded6ec090043dd4cf6567a79ee1dcec8a8705fe66d21d4a4fc659df3", kill_on_drop: false }`
[INFO] [stdout] 154a9186ded6ec090043dd4cf6567a79ee1dcec8a8705fe66d21d4a4fc659df3
