[INFO] fetching crate pychan 0.2.0...
[INFO] checking pychan-0.2.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate pychan 0.2.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate pychan 0.2.0
[INFO] finished tweaking crates.io crate pychan 0.2.0
[INFO] tweaked toml for crates.io crate pychan 0.2.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate pychan 0.2.0 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 37 packages to latest compatible versions
[INFO] [stderr]       Adding pyo3 v0.22.6 (available: v0.27.1)
[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] d0564e5c77d06620a545c6fb296d955a674cefc0226237f397fb199db8a3365f
[INFO] running `Command { std: "docker" "start" "-a" "d0564e5c77d06620a545c6fb296d955a674cefc0226237f397fb199db8a3365f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d0564e5c77d06620a545c6fb296d955a674cefc0226237f397fb199db8a3365f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0564e5c77d06620a545c6fb296d955a674cefc0226237f397fb199db8a3365f", kill_on_drop: false }`
[INFO] [stdout] d0564e5c77d06620a545c6fb296d955a674cefc0226237f397fb199db8a3365f
[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] 40d48f1363a448b9662a30906d6d23f430aa853f0d40b89258a2e9ea5cd817d8
[INFO] running `Command { std: "docker" "start" "-a" "40d48f1363a448b9662a30906d6d23f430aa853f0d40b89258a2e9ea5cd817d8", kill_on_drop: false }`
[INFO] [stderr]    Compiling target-lexicon v0.12.16
[INFO] [stderr]     Checking unindent v0.2.4
[INFO] [stderr]    Compiling indoc v2.0.7
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling pyo3-build-config v0.22.6
[INFO] [stderr]     Checking futures-util v0.3.31
[INFO] [stderr]    Compiling pyo3-macros-backend v0.22.6
[INFO] [stderr]    Compiling pyo3-ffi v0.22.6
[INFO] [stderr]    Compiling pyo3 v0.22.6
[INFO] [stderr]     Checking futures-executor v0.3.31
[INFO] [stderr]     Checking futures v0.3.31
[INFO] [stderr]    Compiling pyo3-macros v0.22.6
[INFO] [stderr]     Checking pychan v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<(PyBytesSender, PyBytesReader), Infallible>
[INFO] [stdout]  --> src/py.rs:7:35
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn bytes_chan(capacity: usize) -> (PyBytesSender, PyBytesReader) {
[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<pyo3::coroutine::Coroutine, Infallible>
[INFO] [stdout]   --> src/py.rs:14:70
[INFO] [stdout]    |
[INFO] [stdout] 14 | async fn chan_send(mut sender: PyBytesSender, bytes: Py<PyBytes>) -> PyResult<()> {
[INFO] [stdout]    |                                                                      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<pyo3::coroutine::Coroutine, Infallible>
[INFO] [stdout]   --> src/py.rs:20:53
[INFO] [stdout]    |
[INFO] [stdout] 20 | async fn sender_close(mut sender: PyBytesSender) -> PyResult<()> {
[INFO] [stdout]    |                                                     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<pyo3::coroutine::Coroutine, Infallible>
[INFO] [stdout]   --> src/py.rs:26:64
[INFO] [stdout]    |
[INFO] [stdout] 26 | async fn chan_read(mut reader: PyBytesReader, bytes: usize) -> PyResult<Py<PyBytes>> {
[INFO] [stdout]    |                                                                ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pychan` (lib test) due to 4 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<(PyBytesSender, PyBytesReader), Infallible>
[INFO] [stdout]  --> src/py.rs:7:35
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn bytes_chan(capacity: usize) -> (PyBytesSender, PyBytesReader) {
[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<pyo3::coroutine::Coroutine, Infallible>
[INFO] [stdout]   --> src/py.rs:14:70
[INFO] [stdout]    |
[INFO] [stdout] 14 | async fn chan_send(mut sender: PyBytesSender, bytes: Py<PyBytes>) -> PyResult<()> {
[INFO] [stdout]    |                                                                      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<pyo3::coroutine::Coroutine, Infallible>
[INFO] [stdout]   --> src/py.rs:20:53
[INFO] [stdout]    |
[INFO] [stdout] 20 | async fn sender_close(mut sender: PyBytesSender) -> PyResult<()> {
[INFO] [stdout]    |                                                     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<pyo3::coroutine::Coroutine, Infallible>
[INFO] [stdout]   --> src/py.rs:26:64
[INFO] [stdout]    |
[INFO] [stdout] 26 | async fn chan_read(mut reader: PyBytesReader, bytes: usize) -> PyResult<Py<PyBytes>> {
[INFO] [stdout]    |                                                                ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pychan` (lib) due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "40d48f1363a448b9662a30906d6d23f430aa853f0d40b89258a2e9ea5cd817d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40d48f1363a448b9662a30906d6d23f430aa853f0d40b89258a2e9ea5cd817d8", kill_on_drop: false }`
[INFO] [stdout] 40d48f1363a448b9662a30906d6d23f430aa853f0d40b89258a2e9ea5cd817d8