[INFO] crate mai 0.1.0 is already in cache
[INFO] testing mai-0.1.0 against beta-2020-07-24 for beta-1.46-1
[INFO] extracting crate mai 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate mai 0.1.0 on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mai 0.1.0
[INFO] finished tweaking crates.io crate mai 0.1.0
[INFO] tweaked toml for crates.io crate mai 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d5f9fc0d3f16f225c242125efc24127fb2e2009bc6670fceb1f8c3ec9944dfe4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d5f9fc0d3f16f225c242125efc24127fb2e2009bc6670fceb1f8c3ec9944dfe4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d5f9fc0d3f16f225c242125efc24127fb2e2009bc6670fceb1f8c3ec9944dfe4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5f9fc0d3f16f225c242125efc24127fb2e2009bc6670fceb1f8c3ec9944dfe4", kill_on_drop: false }`
[INFO] [stdout] d5f9fc0d3f16f225c242125efc24127fb2e2009bc6670fceb1f8c3ec9944dfe4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 17f2dd3c78fe813d53273daf1705e4561ac741a17c2e41bae110c6253e755330
[INFO] running `Command { std: "docker" "start" "-a" "17f2dd3c78fe813d53273daf1705e4561ac741a17c2e41bae110c6253e755330", kill_on_drop: false }`
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling winapi v0.2.8
[INFO] [stderr]    Compiling bitflags v0.4.0
[INFO] [stderr]    Compiling bytes v0.3.0
[INFO] [stderr]    Compiling slab v0.1.3
[INFO] [stderr]    Compiling lifeguard v0.5.2
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling ws2_32-sys v0.2.1
[INFO] [stderr]    Compiling net2 v0.2.34
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling nix v0.5.1
[INFO] [stderr]    Compiling miow v0.1.5
[INFO] [stderr]    Compiling mio v0.5.1
[INFO] [stderr]    Compiling mai v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/evented_frame_stream.rs:211:7
[INFO] [stdout]     |
[INFO] [stdout] 211 |       try!(self.register_interest_in_writing(event_loop, token))
[INFO] [stdout]     |       ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Evented`
[INFO] [stdout]  --> src/protocol_engine.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use mio::{Evented, EventSet, PollOpt, Token};
[INFO] [stdout]   |           ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Recycleable`
[INFO] [stdout]  --> src/protocol_engine.rs:5:23
[INFO] [stdout]   |
[INFO] [stdout] 5 | use lifeguard::{self, Recycleable, Pool, StartingSize, MaxSize, Supplier};
[INFO] [stdout]   |                       ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Read`
[INFO] [stdout]  --> src/protocol_engine.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io::{self, Read, Write};
[INFO] [stdout]   |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]  --> src/protocol_engine.rs:8:27
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io::{self, Read, Write};
[INFO] [stdout]   |                           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/evented_frame_stream.rs:215:9
[INFO] [stdout]     |
[INFO] [stdout] 215 |     let mut outbox = self.outbox(outbox_pool);
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:131:12
[INFO] [stdout]     |
[INFO] [stdout] 131 |        let mut stream_session: &mut StreamSession<P> = stream_session.unwrap();
[INFO] [stdout]     |            ----^^^^^^^^^^^^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:133:13
[INFO] [stdout]     |
[INFO] [stdout] 133 |        let (mut efs, mut session) = stream_session.components();
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:133:22
[INFO] [stdout]     |
[INFO] [stdout] 133 |        let (mut efs, mut session) = stream_session.components();
[INFO] [stdout]     |                      ----^^^^^^^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:215:17
[INFO] [stdout]     |
[INFO] [stdout] 215 |             let mut stream_session: &mut StreamSession<P> = stream_session.unwrap();
[INFO] [stdout]     |                 ----^^^^^^^^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:216:18
[INFO] [stdout]     |
[INFO] [stdout] 216 |             let (mut efs, mut session) = stream_session.components();
[INFO] [stdout]     |                  ----^^^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:216:27
[INFO] [stdout]     |
[INFO] [stdout] 216 |             let (mut efs, mut session) = stream_session.components();
[INFO] [stdout]     |                           ----^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:531:26
[INFO] [stdout]     |
[INFO] [stdout] 531 |     let (codec, _stream, mut write_buffer, outbox) = efs.writing_toolset(buffer_pool, outbox_pool);
[INFO] [stdout]     |                          ----^^^^^^^^^^^^
[INFO] [stdout]     |                          |
[INFO] [stdout]     |                          help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.13s
[INFO] running `Command { std: "docker" "inspect" "17f2dd3c78fe813d53273daf1705e4561ac741a17c2e41bae110c6253e755330", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17f2dd3c78fe813d53273daf1705e4561ac741a17c2e41bae110c6253e755330", kill_on_drop: false }`
[INFO] [stdout] 17f2dd3c78fe813d53273daf1705e4561ac741a17c2e41bae110c6253e755330
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 23d40198d799fcd02b7df99653b38c3ee1e407268cce7551834e1a57436c4845
[INFO] running `Command { std: "docker" "start" "-a" "23d40198d799fcd02b7df99653b38c3ee1e407268cce7551834e1a57436c4845", kill_on_drop: false }`
[INFO] [stderr]    Compiling mai v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/evented_frame_stream.rs:211:7
[INFO] [stdout]     |
[INFO] [stdout] 211 |       try!(self.register_interest_in_writing(event_loop, token))
[INFO] [stdout]     |       ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Evented`
[INFO] [stdout]  --> src/protocol_engine.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use mio::{Evented, EventSet, PollOpt, Token};
[INFO] [stdout]   |           ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Recycleable`
[INFO] [stdout]  --> src/protocol_engine.rs:5:23
[INFO] [stdout]   |
[INFO] [stdout] 5 | use lifeguard::{self, Recycleable, Pool, StartingSize, MaxSize, Supplier};
[INFO] [stdout]   |                       ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Read`
[INFO] [stdout]  --> src/protocol_engine.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io::{self, Read, Write};
[INFO] [stdout]   |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]  --> src/protocol_engine.rs:8:27
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io::{self, Read, Write};
[INFO] [stdout]   |                           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/evented_frame_stream.rs:215:9
[INFO] [stdout]     |
[INFO] [stdout] 215 |     let mut outbox = self.outbox(outbox_pool);
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:131:12
[INFO] [stdout]     |
[INFO] [stdout] 131 |        let mut stream_session: &mut StreamSession<P> = stream_session.unwrap();
[INFO] [stdout]     |            ----^^^^^^^^^^^^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:133:13
[INFO] [stdout]     |
[INFO] [stdout] 133 |        let (mut efs, mut session) = stream_session.components();
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:133:22
[INFO] [stdout]     |
[INFO] [stdout] 133 |        let (mut efs, mut session) = stream_session.components();
[INFO] [stdout]     |                      ----^^^^^^^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:215:17
[INFO] [stdout]     |
[INFO] [stdout] 215 |             let mut stream_session: &mut StreamSession<P> = stream_session.unwrap();
[INFO] [stdout]     |                 ----^^^^^^^^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:216:18
[INFO] [stdout]     |
[INFO] [stdout] 216 |             let (mut efs, mut session) = stream_session.components();
[INFO] [stdout]     |                  ----^^^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:216:27
[INFO] [stdout]     |
[INFO] [stdout] 216 |             let (mut efs, mut session) = stream_session.components();
[INFO] [stdout]     |                           ----^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:531:26
[INFO] [stdout]     |
[INFO] [stdout] 531 |     let (codec, _stream, mut write_buffer, outbox) = efs.writing_toolset(buffer_pool, outbox_pool);
[INFO] [stdout]     |                          ----^^^^^^^^^^^^
[INFO] [stdout]     |                          |
[INFO] [stdout]     |                          help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stdout]    --> src/evented_frame_stream.rs:211:7
[INFO] [stdout]     |
[INFO] [stdout] 211 |       try!(self.register_interest_in_writing(event_loop, token))
[INFO] [stdout]     |       ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Evented`
[INFO] [stdout]  --> src/protocol_engine.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use mio::{Evented, EventSet, PollOpt, Token};
[INFO] [stdout]   |           ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Recycleable`
[INFO] [stdout]  --> src/protocol_engine.rs:5:23
[INFO] [stdout]   |
[INFO] [stdout] 5 | use lifeguard::{self, Recycleable, Pool, StartingSize, MaxSize, Supplier};
[INFO] [stdout]   |                       ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Read`
[INFO] [stdout]  --> src/protocol_engine.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io::{self, Read, Write};
[INFO] [stdout]   |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]  --> src/protocol_engine.rs:8:27
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io::{self, Read, Write};
[INFO] [stdout]   |                           ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/evented_frame_stream.rs:215:9
[INFO] [stdout]     |
[INFO] [stdout] 215 |     let mut outbox = self.outbox(outbox_pool);
[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: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:131:12
[INFO] [stdout]     |
[INFO] [stdout] 131 |        let mut stream_session: &mut StreamSession<P> = stream_session.unwrap();
[INFO] [stdout]     |            ----^^^^^^^^^^^^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:133:13
[INFO] [stdout]     |
[INFO] [stdout] 133 |        let (mut efs, mut session) = stream_session.components();
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:133:22
[INFO] [stdout]     |
[INFO] [stdout] 133 |        let (mut efs, mut session) = stream_session.components();
[INFO] [stdout]     |                      ----^^^^^^^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:215:17
[INFO] [stdout]     |
[INFO] [stdout] 215 |             let mut stream_session: &mut StreamSession<P> = stream_session.unwrap();
[INFO] [stdout]     |                 ----^^^^^^^^^^^^^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:216:18
[INFO] [stdout]     |
[INFO] [stdout] 216 |             let (mut efs, mut session) = stream_session.components();
[INFO] [stdout]     |                  ----^^^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:216:27
[INFO] [stdout]     |
[INFO] [stdout] 216 |             let (mut efs, mut session) = stream_session.components();
[INFO] [stdout]     |                           ----^^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/protocol_engine.rs:531:26
[INFO] [stdout]     |
[INFO] [stdout] 531 |     let (codec, _stream, mut write_buffer, outbox) = efs.writing_toolset(buffer_pool, outbox_pool);
[INFO] [stdout]     |                          ----^^^^^^^^^^^^
[INFO] [stdout]     |                          |
[INFO] [stdout]     |                          help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.51s
[INFO] running `Command { std: "docker" "inspect" "23d40198d799fcd02b7df99653b38c3ee1e407268cce7551834e1a57436c4845", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23d40198d799fcd02b7df99653b38c3ee1e407268cce7551834e1a57436c4845", kill_on_drop: false }`
[INFO] [stdout] 23d40198d799fcd02b7df99653b38c3ee1e407268cce7551834e1a57436c4845
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 877eef273b46cceaf526b68ba26d3ea83a98eaee3b5661b6e7fbf70c4305404f
[INFO] running `Command { std: "docker" "start" "-a" "877eef273b46cceaf526b68ba26d3ea83a98eaee3b5661b6e7fbf70c4305404f", kill_on_drop: false }`
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/evented_frame_stream.rs:211:7
[INFO] [stderr]     |
[INFO] [stderr] 211 |       try!(self.register_interest_in_writing(event_loop, token))
[INFO] [stderr]     |       ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Evented`
[INFO] [stderr]  --> src/protocol_engine.rs:1:11
[INFO] [stderr]   |
[INFO] [stderr] 1 | use mio::{Evented, EventSet, PollOpt, Token};
[INFO] [stderr]   |           ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Recycleable`
[INFO] [stderr]  --> src/protocol_engine.rs:5:23
[INFO] [stderr]   |
[INFO] [stderr] 5 | use lifeguard::{self, Recycleable, Pool, StartingSize, MaxSize, Supplier};
[INFO] [stderr]   |                       ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Read`
[INFO] [stderr]  --> src/protocol_engine.rs:8:21
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::io::{self, Read, Write};
[INFO] [stderr]   |                     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Write`
[INFO] [stderr]  --> src/protocol_engine.rs:8:27
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::io::{self, Read, Write};
[INFO] [stderr]   |                           ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/evented_frame_stream.rs:215:9
[INFO] [stderr]     |
[INFO] [stderr] 215 |     let mut outbox = self.outbox(outbox_pool);
[INFO] [stderr]     |         ----^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:131:12
[INFO] [stderr]     |
[INFO] [stderr] 131 |        let mut stream_session: &mut StreamSession<P> = stream_session.unwrap();
[INFO] [stderr]     |            ----^^^^^^^^^^^^^^
[INFO] [stderr]     |            |
[INFO] [stderr]     |            help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:133:13
[INFO] [stderr]     |
[INFO] [stderr] 133 |        let (mut efs, mut session) = stream_session.components();
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:133:22
[INFO] [stderr]     |
[INFO] [stderr] 133 |        let (mut efs, mut session) = stream_session.components();
[INFO] [stderr]     |                      ----^^^^^^^
[INFO] [stderr]     |                      |
[INFO] [stderr]     |                      help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:215:17
[INFO] [stderr]     |
[INFO] [stderr] 215 |             let mut stream_session: &mut StreamSession<P> = stream_session.unwrap();
[INFO] [stderr]     |                 ----^^^^^^^^^^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:216:18
[INFO] [stderr]     |
[INFO] [stderr] 216 |             let (mut efs, mut session) = stream_session.components();
[INFO] [stderr]     |                  ----^^^
[INFO] [stderr]     |                  |
[INFO] [stderr]     |                  help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:216:27
[INFO] [stderr]     |
[INFO] [stderr] 216 |             let (mut efs, mut session) = stream_session.components();
[INFO] [stderr]     |                           ----^^^^^^^
[INFO] [stderr]     |                           |
[INFO] [stderr]     |                           help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:531:26
[INFO] [stderr]     |
[INFO] [stderr] 531 |     let (codec, _stream, mut write_buffer, outbox) = efs.writing_toolset(buffer_pool, outbox_pool);
[INFO] [stderr]     |                          ----^^^^^^^^^^^^
[INFO] [stderr]     |                          |
[INFO] [stderr]     |                          help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/evented_frame_stream.rs:211:7
[INFO] [stderr]     |
[INFO] [stderr] 211 |       try!(self.register_interest_in_writing(event_loop, token))
[INFO] [stderr]     |       ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Evented`
[INFO] [stderr]  --> src/protocol_engine.rs:1:11
[INFO] [stderr]   |
[INFO] [stderr] 1 | use mio::{Evented, EventSet, PollOpt, Token};
[INFO] [stderr]   |           ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Recycleable`
[INFO] [stderr]  --> src/protocol_engine.rs:5:23
[INFO] [stderr]   |
[INFO] [stderr] 5 | use lifeguard::{self, Recycleable, Pool, StartingSize, MaxSize, Supplier};
[INFO] [stderr]   |                       ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Read`
[INFO] [stderr]  --> src/protocol_engine.rs:8:21
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::io::{self, Read, Write};
[INFO] [stderr]   |                     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Write`
[INFO] [stderr]  --> src/protocol_engine.rs:8:27
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::io::{self, Read, Write};
[INFO] [stderr]   |                           ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/evented_frame_stream.rs:215:9
[INFO] [stderr]     |
[INFO] [stderr] 215 |     let mut outbox = self.outbox(outbox_pool);
[INFO] [stderr]     |         ----^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:131:12
[INFO] [stderr]     |
[INFO] [stderr] 131 |        let mut stream_session: &mut StreamSession<P> = stream_session.unwrap();
[INFO] [stderr]     |            ----^^^^^^^^^^^^^^
[INFO] [stderr]     |            |
[INFO] [stderr]     |            help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:133:13
[INFO] [stderr]     |
[INFO] [stderr] 133 |        let (mut efs, mut session) = stream_session.components();
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:133:22
[INFO] [stderr]     |
[INFO] [stderr] 133 |        let (mut efs, mut session) = stream_session.components();
[INFO] [stderr]     |                      ----^^^^^^^
[INFO] [stderr]     |                      |
[INFO] [stderr]     |                      help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:215:17
[INFO] [stderr]     |
[INFO] [stderr] 215 |             let mut stream_session: &mut StreamSession<P> = stream_session.unwrap();
[INFO] [stderr]     |                 ----^^^^^^^^^^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:216:18
[INFO] [stderr]     |
[INFO] [stderr] 216 |             let (mut efs, mut session) = stream_session.components();
[INFO] [stderr]     |                  ----^^^
[INFO] [stderr]     |                  |
[INFO] [stderr]     |                  help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:216:27
[INFO] [stderr]     |
[INFO] [stderr] 216 |             let (mut efs, mut session) = stream_session.components();
[INFO] [stderr]     |                           ----^^^^^^^
[INFO] [stderr]     |                           |
[INFO] [stderr]     |                           help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/protocol_engine.rs:531:26
[INFO] [stderr]     |
[INFO] [stderr] 531 |     let (codec, _stream, mut write_buffer, outbox) = efs.writing_toolset(buffer_pool, outbox_pool);
[INFO] [stderr]     |                          ----^^^^^^^^^^^^
[INFO] [stderr]     |                          |
[INFO] [stderr]     |                          help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/mai-3f11aa9e620ae89e
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/lib-93768d7e377427d8
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stderr]    Doc-tests mai
[INFO] [stdout] test tests::test_restack ... ok
[INFO] [stdout] test tests::test_restack_everything_consumed ... ok
[INFO] [stdout] test tests::test_restack_nothing_consumed ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "877eef273b46cceaf526b68ba26d3ea83a98eaee3b5661b6e7fbf70c4305404f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "877eef273b46cceaf526b68ba26d3ea83a98eaee3b5661b6e7fbf70c4305404f", kill_on_drop: false }`
[INFO] [stdout] 877eef273b46cceaf526b68ba26d3ea83a98eaee3b5661b6e7fbf70c4305404f