[INFO] cloning repository https://github.com/KillyBOT/in_place_once_cell
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KillyBOT/in_place_once_cell" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKillyBOT%2Fin_place_once_cell", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKillyBOT%2Fin_place_once_cell'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b81bed86deddbd1d9d6cd6cc7fce1fc6313b2ae5
[INFO] checking KillyBOT/in_place_once_cell 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%2FKillyBOT%2Fin_place_once_cell" "/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/KillyBOT/in_place_once_cell
[INFO] finished tweaking git repo https://github.com/KillyBOT/in_place_once_cell
[INFO] tweaked toml for git repo https://github.com/KillyBOT/in_place_once_cell written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/KillyBOT/in_place_once_cell 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/KillyBOT/in_place_once_cell 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] d88429e98e2d8128fd62d840eb04a12a873e7303918216861416e2a6d8944591
[INFO] running `Command { std: "docker" "start" "-a" "d88429e98e2d8128fd62d840eb04a12a873e7303918216861416e2a6d8944591", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d88429e98e2d8128fd62d840eb04a12a873e7303918216861416e2a6d8944591", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d88429e98e2d8128fd62d840eb04a12a873e7303918216861416e2a6d8944591", kill_on_drop: false }`
[INFO] [stdout] d88429e98e2d8128fd62d840eb04a12a873e7303918216861416e2a6d8944591
[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] 66a5216e66d77c60c3909aecde189f36a29135853aeb50eb810c1bbe180966be
[INFO] running `Command { std: "docker" "start" "-a" "66a5216e66d77c60c3909aecde189f36a29135853aeb50eb810c1bbe180966be", kill_on_drop: false }`
[INFO] [stderr]     Checking in_place_once_cell v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Never>
[INFO] [stdout]   --> src/lock.rs:89:15
[INFO] [stdout]    |
[INFO] [stdout] 89 |           match self.get_or_try_mutate(|val: &mut T| {
[INFO] [stdout]    |  _______________^
[INFO] [stdout] 90 | |             f(val);
[INFO] [stdout] 91 | |             Ok::<(), Never>(())
[INFO] [stdout] 92 | |         }) {
[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<&T, Never>
[INFO] [stdout]    --> src/lock.rs:105:15
[INFO] [stdout]     |
[INFO] [stdout] 105 |           match self.get_or_try_mutate(|val: &mut T| {
[INFO] [stdout]     |  _______________^
[INFO] [stdout] 106 | |             f(val);
[INFO] [stdout] 107 | |             Ok::<(), Never>(())
[INFO] [stdout] 108 | |         }) {
[INFO] [stdout]     | |__________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `in_place_once_cell` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Never>
[INFO] [stdout]   --> src/lock.rs:89:15
[INFO] [stdout]    |
[INFO] [stdout] 89 |           match self.get_or_try_mutate(|val: &mut T| {
[INFO] [stdout]    |  _______________^
[INFO] [stdout] 90 | |             f(val);
[INFO] [stdout] 91 | |             Ok::<(), Never>(())
[INFO] [stdout] 92 | |         }) {
[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<&T, Never>
[INFO] [stdout]    --> src/lock.rs:105:15
[INFO] [stdout]     |
[INFO] [stdout] 105 |           match self.get_or_try_mutate(|val: &mut T| {
[INFO] [stdout]     |  _______________^
[INFO] [stdout] 106 | |             f(val);
[INFO] [stdout] 107 | |             Ok::<(), Never>(())
[INFO] [stdout] 108 | |         }) {
[INFO] [stdout]     | |__________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `in_place_once_cell` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "66a5216e66d77c60c3909aecde189f36a29135853aeb50eb810c1bbe180966be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "66a5216e66d77c60c3909aecde189f36a29135853aeb50eb810c1bbe180966be", kill_on_drop: false }`
[INFO] [stdout] 66a5216e66d77c60c3909aecde189f36a29135853aeb50eb810c1bbe180966be