[INFO] updating cached repository https://github.com/irrustible/tingle
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/irrustible/tingle
[INFO] [stderr]  * [new branch]      refactor   -> refactor
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c374ba93c2abdc073f00663b1e0a57a792af9785
[INFO] testing irrustible/tingle against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Firrustible%2Ftingle" "/workspace/builds/worker-5/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/irrustible/tingle on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/irrustible/tingle
[INFO] finished tweaking git repo https://github.com/irrustible/tingle
[INFO] tweaked toml for git repo https://github.com/irrustible/tingle written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/irrustible/tingle already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a5e8b72fff7903c4d3ff0d650536b321c5b74df85aeca48cb8a37c09700fea88
[INFO] running `"docker" "start" "-a" "a5e8b72fff7903c4d3ff0d650536b321c5b74df85aeca48cb8a37c09700fea88"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]    Compiling maybe-unwind v0.3.1
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling async-task v3.0.0
[INFO] [stderr]    Compiling scoped-tls-hkt v0.1.2
[INFO] [stderr]    Compiling intmap v0.7.0
[INFO] [stderr]    Compiling im v14.3.0
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling bitmaps v2.1.0
[INFO] [stderr]    Compiling crossbeam v0.7.3
[INFO] [stderr]    Compiling futures-util v0.3.4
[INFO] [stderr]    Compiling rand_xoshiro v0.4.0
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]    Compiling nix v0.17.0
[INFO] [stderr]    Compiling socket2 v0.3.12
[INFO] [stderr]    Compiling sized-chunks v0.5.3
[INFO] [stderr]    Compiling futures v0.3.4
[INFO] [stderr]    Compiling piper v0.1.1
[INFO] [stderr]    Compiling piper v0.1.1 (https://github.com/stjepang/piper#fd916909)
[INFO] [stderr]    Compiling thiserror-impl v1.0.16
[INFO] [stderr]    Compiling thiserror v1.0.16
[INFO] [stderr]    Compiling smol v0.1.4 (https://github.com/stjepang/smol#5c44e642)
[INFO] [stderr]    Compiling tingle v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(type_alias_impl_trait, min_specialization)] // async_closure, trait_alias
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Promise`, `WeakResolver`
[INFO] [stderr]  --> src/lib.rs:8:15
[INFO] [stderr]   |
[INFO] [stderr] 8 | use promise::{Promise, WeakResolver};
[INFO] [stderr]   |               ^^^^^^^  ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Bad`, `Good`, `HANGUP`
[INFO] [stderr]  --> src/tangle.rs:5:13
[INFO] [stderr]   |
[INFO] [stderr] 5 | use crate::{Bad, Boson, Good, HANGUP, Name, Oops, Superposition};
[INFO] [stderr]   |             ^^^         ^^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Promised`
[INFO] [stderr]  --> src/tangle.rs:6:31
[INFO] [stderr]   |
[INFO] [stderr] 6 | use crate::promise::{Promise, Promised};
[INFO] [stderr]   |                               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Bad`, `Good`
[INFO] [stderr]  --> src/observables.rs:4:13
[INFO] [stderr]   |
[INFO] [stderr] 4 | use crate::{Bad, Entanglement, Good, Name, Oops, Superposition, Tangle};
[INFO] [stderr]   |             ^^^                ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `scoped`
[INFO] [stderr]  --> src/observables.rs:5:19
[INFO] [stderr]   |
[INFO] [stderr] 5 | use crate::wack::{scoped, Scope};
[INFO] [stderr]   |                   ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `core::convert::From`
[INFO] [stderr]  --> src/quantum.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use core::convert::From;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `core::future::Future`
[INFO] [stderr]  --> src/quantum.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use core::future::Future;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `core::pin::Pin`
[INFO] [stderr]  --> src/quantum.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use core::pin::Pin;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Context`, `Poll`
[INFO] [stderr]  --> src/quantum.rs:4:18
[INFO] [stderr]   |
[INFO] [stderr] 4 | use core::task::{Context, Poll};
[INFO] [stderr]   |                  ^^^^^^^  ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `core::time::Duration`
[INFO] [stderr]  --> src/quantum.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use core::time::Duration;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Bad`, `Good`
[INFO] [stderr]  --> src/quantum.rs:6:13
[INFO] [stderr]   |
[INFO] [stderr] 6 | use crate::{Bad, Boson, Entanglement, Good, Name, Oops, Superposition, Tangle};
[INFO] [stderr]   |             ^^^                       ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::backend`
[INFO] [stderr]  --> src/quantum.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use crate::backend;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Promise`
[INFO] [stderr]  --> src/quantum.rs:8:22
[INFO] [stderr]   |
[INFO] [stderr] 8 | use crate::promise::{Promise, WeakResolver};
[INFO] [stderr]   |                      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `futures::stream::Stream`
[INFO] [stderr]   --> src/quantum.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use futures::stream::Stream;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Sender`
[INFO] [stderr]   --> src/quantum.rs:12:29
[INFO] [stderr]    |
[INFO] [stderr] 12 | use piper::{chan, Receiver, Sender};
[INFO] [stderr]    |                             ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `core::future::Future`
[INFO] [stderr]   --> src/lib.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 | use core::future::Future;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Receiver`, `Sender`
[INFO] [stderr]   --> src/lib.rs:26:13
[INFO] [stderr]    |
[INFO] [stderr] 26 | use piper::{Receiver, Sender};
[INFO] [stderr]    |             ^^^^^^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 17 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `tingle`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "a5e8b72fff7903c4d3ff0d650536b321c5b74df85aeca48cb8a37c09700fea88"`
[INFO] running `"docker" "rm" "-f" "a5e8b72fff7903c4d3ff0d650536b321c5b74df85aeca48cb8a37c09700fea88"`
[INFO] [stdout] a5e8b72fff7903c4d3ff0d650536b321c5b74df85aeca48cb8a37c09700fea88