[INFO] fetching crate reflux 6.4.2...
[INFO] checking reflux-6.4.2 against 1.95.0 for pr-155915
[INFO] extracting crate reflux 6.4.2 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate reflux 6.4.2
[INFO] finished tweaking crates.io crate reflux 6.4.2
[INFO] tweaked toml for crates.io crate reflux 6.4.2 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate reflux 6.4.2 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 reflux 6.4.2 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] 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] a8e4ab5f43eb7782a56e20e904b3ec9bffd62944db5110696b8976efd3d86103
[INFO] running `Command { std: "docker" "start" "-a" "a8e4ab5f43eb7782a56e20e904b3ec9bffd62944db5110696b8976efd3d86103", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a8e4ab5f43eb7782a56e20e904b3ec9bffd62944db5110696b8976efd3d86103", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8e4ab5f43eb7782a56e20e904b3ec9bffd62944db5110696b8976efd3d86103", kill_on_drop: false }`
[INFO] [stdout] a8e4ab5f43eb7782a56e20e904b3ec9bffd62944db5110696b8976efd3d86103
[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=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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 28d2e8e2da672aade8ff30f070fb56b53974880527678d1388fdcd912dadc92a
[INFO] running `Command { std: "docker" "start" "-a" "28d2e8e2da672aade8ff30f070fb56b53974880527678d1388fdcd912dadc92a", kill_on_drop: false }`
[INFO] [stderr]     Checking crossbeam-channel v0.5.14
[INFO] [stderr]     Checking reflux v6.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(coroutines, coroutine_trait, stmt_expr_attributes)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]     --> src/lib.rs:1355:9
[INFO] [stdout]      |
[INFO] [stdout] 1304 |         return;
[INFO] [stdout]      |         ------ any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 1355 |         yield TransformerResult::Effect(TransformerEffectType::Debug($a));
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]      |
[INFO] [stdout]     ::: src/tests.rs:481:9
[INFO] [stdout]      |
[INFO] [stdout]  481 |         effect_debug!(vec!["Invalid effect".to_string()]);
[INFO] [stdout]      |         ------------------------------------------------- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout]      = note: this warning originates in the macro `effect_debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]     --> src/lib.rs:1355:9
[INFO] [stdout]      |
[INFO] [stdout] 1319 |         return;
[INFO] [stdout]      |         ------ any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 1355 |         yield TransformerResult::Effect(TransformerEffectType::Debug($a));
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]      |
[INFO] [stdout]     ::: src/tests.rs:519:9
[INFO] [stdout]      |
[INFO] [stdout]  519 |         effect_debug!(vec!["Invalid effect".to_string()]);
[INFO] [stdout]      |         ------------------------------------------------- in this macro invocation
[INFO] [stdout]      |
[INFO] [stdout]      = note: this warning originates in the macro `effect_debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(coroutines, coroutine_trait, stmt_expr_attributes)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `reflux` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `reflux` (lib test) due to 1 previous error; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "28d2e8e2da672aade8ff30f070fb56b53974880527678d1388fdcd912dadc92a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "28d2e8e2da672aade8ff30f070fb56b53974880527678d1388fdcd912dadc92a", kill_on_drop: false }`
[INFO] [stdout] 28d2e8e2da672aade8ff30f070fb56b53974880527678d1388fdcd912dadc92a
