[INFO] fetching crate gain 0.5.0...
[INFO] checking gain-0.5.0 against try#fafe42c59556a4233f03dd0d900b575a9afeece8 for pr-143764
[INFO] extracting crate gain 0.5.0 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate gain 0.5.0
[INFO] finished tweaking crates.io crate gain 0.5.0
[INFO] tweaked toml for crates.io crate gain 0.5.0 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate gain 0.5.0 on toolchain fafe42c59556a4233f03dd0d900b575a9afeece8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fafe42c59556a4233f03dd0d900b575a9afeece8" "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" "+fafe42c59556a4233f03dd0d900b575a9afeece8" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 8 packages to latest compatible versions
[INFO] [stderr]       Adding async-task v1.3.1 (available: v4.7.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fafe42c59556a4233f03dd0d900b575a9afeece8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+fafe42c59556a4233f03dd0d900b575a9afeece8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a567e171d1ec34624113894a5ff544954698ade1c4b96156689e6f1463bda966
[INFO] running `Command { std: "docker" "start" "-a" "a567e171d1ec34624113894a5ff544954698ade1c4b96156689e6f1463bda966", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a567e171d1ec34624113894a5ff544954698ade1c4b96156689e6f1463bda966", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a567e171d1ec34624113894a5ff544954698ade1c4b96156689e6f1463bda966", kill_on_drop: false }`
[INFO] [stdout] a567e171d1ec34624113894a5ff544954698ade1c4b96156689e6f1463bda966
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+fafe42c59556a4233f03dd0d900b575a9afeece8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ec414295f6777f834b2ef7fb0056771c308878e3f1e8733746832a2d79692c6e
[INFO] running `Command { std: "docker" "start" "-a" "ec414295f6777f834b2ef7fb0056771c308878e3f1e8733746832a2d79692c6e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]     Checking futures-core v0.3.31
[INFO] [stderr]     Checking lazy_static v1.5.0
[INFO] [stderr]     Checking futures-channel v0.3.31
[INFO] [stderr]     Checking async-task v1.3.1
[INFO] [stderr]     Checking gain v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/core.rs:315:13
[INFO] [stdout]     |
[INFO] [stdout] 315 |         let mut prev_share = prev.as_mut().unwrap();
[INFO] [stdout]     |             ----^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> src/stream/mod.rs:27:16
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn recv<R>(&mut self, capacity: usize, receptor: R) -> future::Recv<R>
[INFO] [stdout]    |                ^^^^^^^^^ this lifetime flows to the output --------------- the lifetime gets resolved as `'_`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn recv<R>(&mut self, capacity: usize, receptor: R) -> future::Recv<'_, R>
[INFO] [stdout]    |                                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> src/stream/mod.rs:35:19
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn write<'a>(&'a mut self, data: &'a [u8]) -> future::Write;
[INFO] [stdout]    |                   ^^                  ^^          ------------- the lifetime gets resolved as `'a`
[INFO] [stdout]    |                   |                   |
[INFO] [stdout]    |                   |                   these lifetimes flow to the output
[INFO] [stdout]    |                   these lifetimes flow to the output
[INFO] [stdout]    |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn write<'a>(&'a mut self, data: &'a [u8]) -> future::Write<'a>;
[INFO] [stdout]    |                                                                ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> src/stream/mod.rs:38:24
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn write_note<'a>(&'a mut self, data: &'a [u8], note: i32) -> future::Write;
[INFO] [stdout]    |                        ^^                  ^^                     ------------- the lifetime gets resolved as `'a`
[INFO] [stdout]    |                        |                   |
[INFO] [stdout]    |                        |                   these lifetimes flow to the output
[INFO] [stdout]    |                        these lifetimes flow to the output
[INFO] [stdout]    |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn write_note<'a>(&'a mut self, data: &'a [u8], note: i32) -> future::Write<'a>;
[INFO] [stdout]    |                                                                                ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> src/stream/mod.rs:41:23
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn write_all<'a>(&'a mut self, data: &'a [u8]) -> future::WriteAll;
[INFO] [stdout]    |                       ^^                  ^^          ---------------- the lifetime gets resolved as `'a`
[INFO] [stdout]    |                       |                   |
[INFO] [stdout]    |                       |                   these lifetimes flow to the output
[INFO] [stdout]    |                       these lifetimes flow to the output
[INFO] [stdout]    |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]    |
[INFO] [stdout] 41 |     fn write_all<'a>(&'a mut self, data: &'a [u8]) -> future::WriteAll<'a>;
[INFO] [stdout]    |                                                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> src/stream/mod.rs:92:16
[INFO] [stdout]    |
[INFO] [stdout] 92 |     fn recv<R>(&mut self, capacity: usize, receptor: R) -> future::Recv<R>
[INFO] [stdout]    |                ^^^^^^^^^ this lifetime flows to the output --------------- the lifetime gets resolved as `'_`
[INFO] [stdout]    |
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]    |
[INFO] [stdout] 92 |     fn recv<R>(&mut self, capacity: usize, receptor: R) -> future::Recv<'_, R>
[INFO] [stdout]    |                                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/mod.rs:101:19
[INFO] [stdout]     |
[INFO] [stdout] 101 |     fn write<'a>(&'a mut self, data: &'a [u8]) -> future::Write {
[INFO] [stdout]     |                   ^^                  ^^          ------------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                   |                   |
[INFO] [stdout]     |                   |                   these lifetimes flow to the output
[INFO] [stdout]     |                   these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 101 |     fn write<'a>(&'a mut self, data: &'a [u8]) -> future::Write<'a> {
[INFO] [stdout]     |                                                                ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/mod.rs:105:24
[INFO] [stdout]     |
[INFO] [stdout] 105 |     fn write_note<'a>(&'a mut self, data: &'a [u8], note: i32) -> future::Write {
[INFO] [stdout]     |                        ^^                  ^^                     ------------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                        |                   |
[INFO] [stdout]     |                        |                   these lifetimes flow to the output
[INFO] [stdout]     |                        these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 105 |     fn write_note<'a>(&'a mut self, data: &'a [u8], note: i32) -> future::Write<'a> {
[INFO] [stdout]     |                                                                                ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/mod.rs:109:23
[INFO] [stdout]     |
[INFO] [stdout] 109 |     fn write_all<'a>(&'a mut self, data: &'a [u8]) -> future::WriteAll {
[INFO] [stdout]     |                       ^^                  ^^          ---------------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                       |                   |
[INFO] [stdout]     |                       |                   these lifetimes flow to the output
[INFO] [stdout]     |                       these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 109 |     fn write_all<'a>(&'a mut self, data: &'a [u8]) -> future::WriteAll<'a> {
[INFO] [stdout]     |                                                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/mod.rs:167:16
[INFO] [stdout]     |
[INFO] [stdout] 167 |     fn recv<R>(&mut self, capacity: usize, receptor: R) -> future::Recv<R>
[INFO] [stdout]     |                ^^^^^^^^^ this lifetime flows to the output --------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 167 |     fn recv<R>(&mut self, capacity: usize, receptor: R) -> future::Recv<'_, R>
[INFO] [stdout]     |                                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/mod.rs:209:16
[INFO] [stdout]     |
[INFO] [stdout] 209 |     fn recv<R>(&mut self, capacity: usize, receptor: R) -> future::Recv<R>
[INFO] [stdout]     |                ^^^^^^^^^ this lifetime flows to the output --------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 209 |     fn recv<R>(&mut self, capacity: usize, receptor: R) -> future::Recv<'_, R>
[INFO] [stdout]     |                                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/mod.rs:257:19
[INFO] [stdout]     |
[INFO] [stdout] 257 |     fn write<'a>(&'a mut self, data: &'a [u8]) -> future::Write {
[INFO] [stdout]     |                   ^^                  ^^          ------------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                   |                   |
[INFO] [stdout]     |                   |                   these lifetimes flow to the output
[INFO] [stdout]     |                   these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 257 |     fn write<'a>(&'a mut self, data: &'a [u8]) -> future::Write<'a> {
[INFO] [stdout]     |                                                                ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/mod.rs:261:24
[INFO] [stdout]     |
[INFO] [stdout] 261 |     fn write_note<'a>(&'a mut self, data: &'a [u8], note: i32) -> future::Write {
[INFO] [stdout]     |                        ^^                  ^^                     ------------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                        |                   |
[INFO] [stdout]     |                        |                   these lifetimes flow to the output
[INFO] [stdout]     |                        these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 261 |     fn write_note<'a>(&'a mut self, data: &'a [u8], note: i32) -> future::Write<'a> {
[INFO] [stdout]     |                                                                                ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/mod.rs:265:23
[INFO] [stdout]     |
[INFO] [stdout] 265 |     fn write_all<'a>(&'a mut self, data: &'a [u8]) -> future::WriteAll {
[INFO] [stdout]     |                       ^^                  ^^          ---------------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                       |                   |
[INFO] [stdout]     |                       |                   these lifetimes flow to the output
[INFO] [stdout]     |                       these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 265 |     fn write_all<'a>(&'a mut self, data: &'a [u8]) -> future::WriteAll<'a> {
[INFO] [stdout]     |                                                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/mod.rs:304:19
[INFO] [stdout]     |
[INFO] [stdout] 304 |     fn write<'a>(&'a mut self, data: &'a [u8]) -> future::Write {
[INFO] [stdout]     |                   ^^                  ^^          ------------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                   |                   |
[INFO] [stdout]     |                   |                   these lifetimes flow to the output
[INFO] [stdout]     |                   these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 304 |     fn write<'a>(&'a mut self, data: &'a [u8]) -> future::Write<'a> {
[INFO] [stdout]     |                                                                ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/mod.rs:308:24
[INFO] [stdout]     |
[INFO] [stdout] 308 |     fn write_note<'a>(&'a mut self, data: &'a [u8], note: i32) -> future::Write {
[INFO] [stdout]     |                        ^^                  ^^                     ------------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                        |                   |
[INFO] [stdout]     |                        |                   these lifetimes flow to the output
[INFO] [stdout]     |                        these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 308 |     fn write_note<'a>(&'a mut self, data: &'a [u8], note: i32) -> future::Write<'a> {
[INFO] [stdout]     |                                                                                ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/mod.rs:312:23
[INFO] [stdout]     |
[INFO] [stdout] 312 |     fn write_all<'a>(&'a mut self, data: &'a [u8]) -> future::WriteAll {
[INFO] [stdout]     |                       ^^                  ^^          ---------------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |                       |                   |
[INFO] [stdout]     |                       |                   these lifetimes flow to the output
[INFO] [stdout]     |                       these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 312 |     fn write_all<'a>(&'a mut self, data: &'a [u8]) -> future::WriteAll<'a> {
[INFO] [stdout]     |                                                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> src/stream/buf.rs:77:18
[INFO] [stdout]    |
[INFO] [stdout] 77 |     fn read<'a>(&'a mut self, dest: &'a mut [u8]) -> future::Read;
[INFO] [stdout]    |                  ^^                  ^^              ------------ the lifetime gets resolved as `'a`
[INFO] [stdout]    |                  |                   |
[INFO] [stdout]    |                  |                   these lifetimes flow to the output
[INFO] [stdout]    |                  these lifetimes flow to the output
[INFO] [stdout]    |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]    |
[INFO] [stdout] 77 |     fn read<'a>(&'a mut self, dest: &'a mut [u8]) -> future::Read<'a>;
[INFO] [stdout]    |                                                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/buf.rs:242:18
[INFO] [stdout]     |
[INFO] [stdout] 242 |     fn read<'a>(&'a mut self, dest: &'a mut [u8]) -> future::Read {
[INFO] [stdout]     |                  ^^                  ^^              ------------ the lifetime gets resolved as `'a`
[INFO] [stdout]     |                  |                   |
[INFO] [stdout]     |                  |                   these lifetimes flow to the output
[INFO] [stdout]     |                  these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 242 |     fn read<'a>(&'a mut self, dest: &'a mut [u8]) -> future::Read<'a> {
[INFO] [stdout]     |                                                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/stream/buf.rs:311:18
[INFO] [stdout]     |
[INFO] [stdout] 311 |     fn read<'a>(&'a mut self, dest: &'a mut [u8]) -> future::Read {
[INFO] [stdout]     |                  ^^                  ^^              ------------ the lifetime gets resolved as `'a`
[INFO] [stdout]     |                  |                   |
[INFO] [stdout]     |                  |                   these lifetimes flow to the output
[INFO] [stdout]     |                  these lifetimes flow to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 311 |     fn read<'a>(&'a mut self, dest: &'a mut [u8]) -> future::Read<'a> {
[INFO] [stdout]     |                                                                  ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gain` (lib test); 20 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   No space left on device (os error 28)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to parse process output: `/opt/rustwide/rustup-home/toolchains/fafe42c59556a4233f03dd0d900b575a9afeece8/bin/rustc --crate-name gain --edition=2021 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --test --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values())' -C metadata=e5053945b2545533 -C extra-filename=-ee674c9a24552658 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern async_task=/opt/rustwide/target/debug/deps/libasync_task-2363d8a51c0309d2.rmeta --extern futures_channel=/opt/rustwide/target/debug/deps/libfutures_channel-966816fdb6f3bc39.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-cb8ca6aa8c56979f.rmeta --cap-lints=forbid` (exit status: 1)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/core.rs:315:13
[INFO] [stdout]     |
[INFO] [stdout] 315 |         let mut prev_share = prev.as_mut().unwrap();
[INFO] [stdout]     |             ----^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gain` (lib); 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   No space left on device (os error 28)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to parse process output: `/opt/rustwide/rustup-home/toolchains/fafe42c59556a4233f03dd0d900b575a9afeece8/bin/rustc --crate-name gain --edition=2021 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values())' -C metadata=b0dce9575c2d40bc -C extra-filename=-7bf02595eeee2de5 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern async_task=/opt/rustwide/target/debug/deps/libasync_task-2363d8a51c0309d2.rmeta --extern futures_channel=/opt/rustwide/target/debug/deps/libfutures_channel-966816fdb6f3bc39.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-cb8ca6aa8c56979f.rmeta --cap-lints=forbid` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "ec414295f6777f834b2ef7fb0056771c308878e3f1e8733746832a2d79692c6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec414295f6777f834b2ef7fb0056771c308878e3f1e8733746832a2d79692c6e", kill_on_drop: false }`
[INFO] [stdout] ec414295f6777f834b2ef7fb0056771c308878e3f1e8733746832a2d79692c6e
