[INFO] cloning repository https://github.com/Lonami/backpropers
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Lonami/backpropers" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLonami%2Fbackpropers", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLonami%2Fbackpropers'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1c04e0bf01d8dc3e47fb2d63e89aede59e10a2e1
[INFO] checking Lonami/backpropers against try#e0f03aec47b100bc29555561bd62a99d1bc6aca5 for pr-86231
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLonami%2Fbackpropers" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Lonami/backpropers on toolchain e0f03aec47b100bc29555561bd62a99d1bc6aca5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e0f03aec47b100bc29555561bd62a99d1bc6aca5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Lonami/backpropers
[INFO] finished tweaking git repo https://github.com/Lonami/backpropers
[INFO] tweaked toml for git repo https://github.com/Lonami/backpropers written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/Lonami/backpropers already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e0f03aec47b100bc29555561bd62a99d1bc6aca5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+e0f03aec47b100bc29555561bd62a99d1bc6aca5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7d8d181e93c298c94cbef0bac1937cbff6c26e42f9ba6937876c27dd680f5c49
[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" "7d8d181e93c298c94cbef0bac1937cbff6c26e42f9ba6937876c27dd680f5c49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7d8d181e93c298c94cbef0bac1937cbff6c26e42f9ba6937876c27dd680f5c49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d8d181e93c298c94cbef0bac1937cbff6c26e42f9ba6937876c27dd680f5c49", kill_on_drop: false }`
[INFO] [stdout] 7d8d181e93c298c94cbef0bac1937cbff6c26e42f9ba6937876c27dd680f5c49
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+e0f03aec47b100bc29555561bd62a99d1bc6aca5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3835120c918ab6aaad5a3a80c92ca127aeea301f1e11cf64e52c14d6534dc2ad
[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" "3835120c918ab6aaad5a3a80c92ca127aeea301f1e11cf64e52c14d6534dc2ad", kill_on_drop: false }`
[INFO] [stderr]     Checking flysim v0.1.0 (/opt/rustwide/workdir/flysim)
[INFO] [stderr]     Checking backpropers v0.1.0 (/opt/rustwide/workdir/backpropers)
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> backpropers/src/main.rs:415:17
[INFO] [stdout]     |
[INFO] [stdout] 415 |                 format!("bad output for x = {}", x)
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout]     = note: the assert!() macro supports formatting, so there's no need for the format!() macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 415 |                 "bad output for x = {}", x
[INFO] [stdout]     |                --                        --
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> backpropers/src/main.rs:434:17
[INFO] [stdout]     |
[INFO] [stdout] 434 |                 format!("bad output for x = {}", x)
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout]     = note: the assert!() macro supports formatting, so there's no need for the format!() macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 434 |                 "bad output for x = {}", x
[INFO] [stdout]     |                --                        --
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> backpropers/src/main.rs:473:17
[INFO] [stdout]     |
[INFO] [stdout] 473 | /                 format!(
[INFO] [stdout] 474 | |                     "bad output at i = {} (got = {}, expected {})",
[INFO] [stdout] 475 | |                     i, x, expected
[INFO] [stdout] 476 | |                 )
[INFO] [stdout]     | |_________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout]     = note: the assert!() macro supports formatting, so there's no need for the format!() macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 473 |                 
[INFO] [stdout] 474 |                     "bad output at i = {} (got = {}, expected {})",
[INFO] [stdout] 475 |                     i, x, expected
[INFO] [stdout] 476 |                 
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `Command { std: "docker" "inspect" "3835120c918ab6aaad5a3a80c92ca127aeea301f1e11cf64e52c14d6534dc2ad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3835120c918ab6aaad5a3a80c92ca127aeea301f1e11cf64e52c14d6534dc2ad", kill_on_drop: false }`
[INFO] [stdout] 3835120c918ab6aaad5a3a80c92ca127aeea301f1e11cf64e52c14d6534dc2ad