[INFO] cloning repository https://github.com/aster-void/random-char-gen
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/aster-void/random-char-gen" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faster-void%2Frandom-char-gen", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faster-void%2Frandom-char-gen'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d55769f3b56388b0dc1fae74c5d7f5a6e64d54c0
[INFO] checking aster-void/random-char-gen 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%2Faster-void%2Frandom-char-gen" "/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/aster-void/random-char-gen
[INFO] finished tweaking git repo https://github.com/aster-void/random-char-gen
[INFO] tweaked toml for git repo https://github.com/aster-void/random-char-gen written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/aster-void/random-char-gen 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/aster-void/random-char-gen 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] 2d784a4ea80718555bf04c675856244d5319f3ae222f5bb70162a19fb48d7498
[INFO] running `Command { std: "docker" "start" "-a" "2d784a4ea80718555bf04c675856244d5319f3ae222f5bb70162a19fb48d7498", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2d784a4ea80718555bf04c675856244d5319f3ae222f5bb70162a19fb48d7498", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d784a4ea80718555bf04c675856244d5319f3ae222f5bb70162a19fb48d7498", kill_on_drop: false }`
[INFO] [stdout] 2d784a4ea80718555bf04c675856244d5319f3ae222f5bb70162a19fb48d7498
[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] d6a7386fb867f96f2357e207d62904c2ce087ae6dbb114d98c42690567b1d651
[INFO] running `Command { std: "docker" "start" "-a" "d6a7386fb867f96f2357e207d62904c2ce087ae6dbb114d98c42690567b1d651", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.150
[INFO] [stderr]     Checking proconio v0.4.5
[INFO] [stderr]     Checking text_io v0.1.12
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking nix v0.26.4
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand_hc v0.3.2
[INFO] [stderr]     Checking rand_isaac v0.3.0
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking getch-rs v0.2.0
[INFO] [stderr]     Checking random-char-gen v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<Letters, Infallible>
[INFO] [stdout]   --> src/main.rs:76:16
[INFO] [stdout]    |
[INFO] [stdout] 76 |         return Ok(allowed_letters);
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `random-char-gen` (bin "random-char-gen" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<Letters, Infallible>
[INFO] [stdout]   --> src/main.rs:76:16
[INFO] [stdout]    |
[INFO] [stdout] 76 |         return Ok(allowed_letters);
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `random-char-gen` (bin "random-char-gen") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "d6a7386fb867f96f2357e207d62904c2ce087ae6dbb114d98c42690567b1d651", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d6a7386fb867f96f2357e207d62904c2ce087ae6dbb114d98c42690567b1d651", kill_on_drop: false }`
[INFO] [stdout] d6a7386fb867f96f2357e207d62904c2ce087ae6dbb114d98c42690567b1d651
