[INFO] cloning repository https://github.com/rustvu/py_pi
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rustvu/py_pi" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frustvu%2Fpy_pi", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frustvu%2Fpy_pi'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 687012ad661bce6aa302dbffa161862ea39f925b
[INFO] checking rustvu/py_pi 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%2Frustvu%2Fpy_pi" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/rustvu/py_pi
[INFO] finished tweaking git repo https://github.com/rustvu/py_pi
[INFO] tweaked toml for git repo https://github.com/rustvu/py_pi written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/rustvu/py_pi 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/rustvu/py_pi 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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] c0fff9d99f9a55475457ea13f43e4c3373f5cd00c03b1664308ccf57c96c8ebc
[INFO] running `Command { std: "docker" "start" "-a" "c0fff9d99f9a55475457ea13f43e4c3373f5cd00c03b1664308ccf57c96c8ebc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c0fff9d99f9a55475457ea13f43e4c3373f5cd00c03b1664308ccf57c96c8ebc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0fff9d99f9a55475457ea13f43e4c3373f5cd00c03b1664308ccf57c96c8ebc", kill_on_drop: false }`
[INFO] [stdout] c0fff9d99f9a55475457ea13f43e4c3373f5cd00c03b1664308ccf57c96c8ebc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] fe31a161e194427b67c4ee71a288b9e5cc4a199ebe38dc9f5fb17a6cf0e6f2ff
[INFO] running `Command { std: "docker" "start" "-a" "fe31a161e194427b67c4ee71a288b9e5cc4a199ebe38dc9f5fb17a6cf0e6f2ff", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.92
[INFO] [stderr]    Compiling libc v0.2.167
[INFO] [stderr]    Compiling pyo3-build-config v0.23.2
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling syn v2.0.90
[INFO] [stderr]     Checking getrandom v0.2.15
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]    Compiling pyo3-ffi v0.23.2
[INFO] [stderr]    Compiling pyo3-macros-backend v0.23.2
[INFO] [stderr]    Compiling pyo3 v0.23.2
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stderr]     Checking zerocopy v0.7.35
[INFO] [stderr]     Checking ppv-lite86 v0.2.20
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]    Compiling pyo3-macros v0.23.2
[INFO] [stderr]     Checking py_pi v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<f64, Infallible>
[INFO] [stdout]   --> src/lib.rs:22:24
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn single(n: usize) -> f64 {
[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<f64, Infallible>
[INFO] [stdout]   --> src/lib.rs:29:26
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn parallel(n: usize) -> f64 {
[INFO] [stdout]    |                          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `py_pi` (lib test) 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<f64, Infallible>
[INFO] [stdout]   --> src/lib.rs:22:24
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn single(n: usize) -> f64 {
[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<f64, Infallible>
[INFO] [stdout]   --> src/lib.rs:29:26
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn parallel(n: usize) -> f64 {
[INFO] [stdout]    |                          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `py_pi` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "fe31a161e194427b67c4ee71a288b9e5cc4a199ebe38dc9f5fb17a6cf0e6f2ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe31a161e194427b67c4ee71a288b9e5cc4a199ebe38dc9f5fb17a6cf0e6f2ff", kill_on_drop: false }`
[INFO] [stdout] fe31a161e194427b67c4ee71a288b9e5cc4a199ebe38dc9f5fb17a6cf0e6f2ff