[INFO] fetching crate winmix 0.1.3...
[INFO] testing winmix-0.1.3 against 1.95.0 for beta-1.96-2
[INFO] extracting crate winmix 0.1.3 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate winmix 0.1.3
[INFO] finished tweaking crates.io crate winmix 0.1.3
[INFO] tweaked toml for crates.io crate winmix 0.1.3 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate winmix 0.1.3 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate winmix 0.1.3 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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded windows-result v0.1.1
[INFO] [stderr]   Downloaded proc-macro2 v1.0.81
[INFO] [stderr]   Downloaded windows-core v0.56.0
[INFO] [stderr]   Downloaded windows-implement v0.56.0
[INFO] [stderr]   Downloaded windows-interface v0.56.0
[INFO] [stderr]   Downloaded syn v2.0.60
[INFO] [stderr]   Downloaded windows v0.56.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2019802efcad6eed0fb689e8cd1a88c1787718dfff817926d7d86c11f2e52e5b
[INFO] running `Command { std: "docker" "start" "-a" "2019802efcad6eed0fb689e8cd1a88c1787718dfff817926d7d86c11f2e52e5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2019802efcad6eed0fb689e8cd1a88c1787718dfff817926d7d86c11f2e52e5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2019802efcad6eed0fb689e8cd1a88c1787718dfff817926d7d86c11f2e52e5b", kill_on_drop: false }`
[INFO] [stdout] 2019802efcad6eed0fb689e8cd1a88c1787718dfff817926d7d86c11f2e52e5b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fe501a105a04cd83bd4737785efe14bbe98cab702d2676146b45288bf1c5cefb
[INFO] running `Command { std: "docker" "start" "-a" "fe501a105a04cd83bd4737785efe14bbe98cab702d2676146b45288bf1c5cefb", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.81
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling windows_x86_64_gnu v0.52.5
[INFO] [stderr]    Compiling windows-targets v0.52.5
[INFO] [stderr]    Compiling windows-result v0.1.1
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]    Compiling syn v2.0.60
[INFO] [stderr]    Compiling windows-interface v0.56.0
[INFO] [stderr]    Compiling windows-implement v0.56.0
[INFO] [stderr]    Compiling windows-core v0.56.0
[INFO] [stderr]    Compiling windows v0.56.0
[INFO] [stderr]    Compiling winmix v0.1.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.70s
[INFO] running `Command { std: "docker" "inspect" "fe501a105a04cd83bd4737785efe14bbe98cab702d2676146b45288bf1c5cefb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe501a105a04cd83bd4737785efe14bbe98cab702d2676146b45288bf1c5cefb", kill_on_drop: false }`
[INFO] [stdout] fe501a105a04cd83bd4737785efe14bbe98cab702d2676146b45288bf1c5cefb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e432974c8e61041a4e2a342253e9cd27c1795aa949bd0d57bffa4cf78f774672
[INFO] running `Command { std: "docker" "start" "-a" "e432974c8e61041a4e2a342253e9cd27c1795aa949bd0d57bffa4cf78f774672", kill_on_drop: false }`
[INFO] [stderr]    Compiling winmix v0.1.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "e432974c8e61041a4e2a342253e9cd27c1795aa949bd0d57bffa4cf78f774672", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e432974c8e61041a4e2a342253e9cd27c1795aa949bd0d57bffa4cf78f774672", kill_on_drop: false }`
[INFO] [stdout] e432974c8e61041a4e2a342253e9cd27c1795aa949bd0d57bffa4cf78f774672
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] c29448e14080c29c486de641a634a2a721b5e1fc0342224bc45f3adfd7865986
[INFO] running `Command { std: "docker" "start" "-a" "c29448e14080c29c486de641a634a2a721b5e1fc0342224bc45f3adfd7865986", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/winmix-0059806c1d899c72)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stderr]    Doc-tests winmix
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/lib.rs - (line 11) - compile ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 11) stdout ----
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:19:38
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 19 |     let sessions = winmix.enumerate()?;
[INFO] [stdout]    |                                      ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                         +++++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:26:35
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 26 |         session.vol.set_mute(true)?;
[INFO] [stdout]    |                                   ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                         +++++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:27:36
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 27 |         session.vol.set_mute(false)?;
[INFO] [stdout]    |                                    ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                         +++++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:30:43
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 30 |         session.vol.set_master_volume(0.5)?;
[INFO] [stdout]    |                                           ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                         +++++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:32:43
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 32 |         session.vol.set_master_volume(1.0)?;
[INFO] [stdout]    |                                           ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                         +++++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:35:50
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 35 |         let vol = session.vol.get_master_volume()?;
[INFO] [stdout]    |                                                  ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                         +++++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:36:46
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() {
[INFO] [stdout]    |                                      ---------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 36 |         let is_muted = session.vol.get_mute()?;
[INFO] [stdout]    |                                              ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_11_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |                                                                         +++++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 7 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 11)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.06s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "c29448e14080c29c486de641a634a2a721b5e1fc0342224bc45f3adfd7865986", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c29448e14080c29c486de641a634a2a721b5e1fc0342224bc45f3adfd7865986", kill_on_drop: false }`
[INFO] [stdout] c29448e14080c29c486de641a634a2a721b5e1fc0342224bc45f3adfd7865986
