[INFO] fetching crate future-bus 0.2.1... [INFO] testing future-bus-0.2.1 against 1.100.0-beta.1 for beta-1.100-4 [INFO] extracting crate future-bus 0.2.1 into /workspace/builds/worker-5-tc2/source [INFO] started tweaking crates.io crate future-bus 0.2.1 [INFO] finished tweaking crates.io crate future-bus 0.2.1 [INFO] tweaked toml for crates.io crate future-bus 0.2.1 written to /workspace/builds/worker-5-tc2/source/Cargo.toml [INFO] validating manifest of crates.io crate future-bus 0.2.1 on toolchain 1.100.0-beta.1 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "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" "+1.100.0-beta.1" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 33 packages to highest compatible versions [INFO] [stderr] Adding parking_lot v0.9.0 (available: v0.12.5) [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }` [INFO] [stdout] 8fbaffc95e8eb65e2001691a07fc67459872f32e98918a8ba7791292198322c6 [INFO] running `Command { std: "docker" "start" "8fbaffc95e8eb65e2001691a07fc67459872f32e98918a8ba7791292198322c6", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "8fbaffc95e8eb65e2001691a07fc67459872f32e98918a8ba7791292198322c6", kill_on_drop: false }` [INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "8fbaffc95e8eb65e2001691a07fc67459872f32e98918a8ba7791292198322c6" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "8fbaffc95e8eb65e2001691a07fc67459872f32e98918a8ba7791292198322c6", kill_on_drop: false }` [INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "8fbaffc95e8eb65e2001691a07fc67459872f32e98918a8ba7791292198322c6" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stderr] Compiling semver-parser v0.7.0 [INFO] [stderr] Compiling maybe-uninit v2.0.0 [INFO] [stderr] Compiling libc v0.2.190 [INFO] [stderr] Compiling cfg-if v0.1.10 [INFO] [stderr] Compiling futures-core v0.3.34 [INFO] [stderr] Compiling futures-sink v0.3.34 [INFO] [stderr] Compiling lock_api v0.3.4 [INFO] [stderr] Compiling futures-channel v0.3.34 [INFO] [stderr] Compiling semver v0.9.0 [INFO] [stderr] Compiling smallvec v0.6.14 [INFO] [stderr] Compiling rustc_version v0.2.3 [INFO] [stderr] Compiling parking_lot_core v0.6.3 [INFO] [stderr] Compiling parking_lot v0.9.0 [INFO] [stderr] Compiling future-bus v0.2.1 (/opt/rustwide/workdir) [INFO] [stdout] error[E0277]: a value of type `!` cannot be built from an iterator over elements of type `()` [INFO] [stdout] --> src/lib.rs:188:24 [INFO] [stdout] | [INFO] [stdout] 188 | .collect::>()?; [INFO] [stdout] | ------- ^^^^^^^^^^^^ value of type `!` cannot be built from `std::iter::Iterator` [INFO] [stdout] | | [INFO] [stdout] | required by a bound introduced by this call [INFO] [stdout] | [INFO] [stdout] = help: the trait `FromIterator<()>` is not implemented for `!` [INFO] [stdout] help: the trait `FromIterator>` is conditionally implemented for `Result` [INFO] [stdout] --> /rustc/e3feeb59cd1bdd011a2bfcc0747b55125d9b8527/library/core/src/result.rs:2114:14 [INFO] [stdout] | [INFO] [stdout] = note: unsatisfied requirement introduced here: `!: FromIterator<()>` [INFO] [stdout] = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #148922 for more information) [INFO] [stdout] = help: you might have intended to use the type `()` here instead [INFO] [stdout] = note: required for `Result>::Error>` to implement `FromIterator>::Error>>` [INFO] [stdout] note: required by a bound in `collect` [INFO] [stdout] --> /rustc/e3feeb59cd1bdd011a2bfcc0747b55125d9b8527/library/core/src/iter/traits/iterator.rs:2087:4 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0277`. [INFO] [stdout] [INFO] [stderr] error: could not compile `future-bus` (lib) due to 1 previous error [INFO] running `Command { std: "docker" "inspect" "8fbaffc95e8eb65e2001691a07fc67459872f32e98918a8ba7791292198322c6", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "8fbaffc95e8eb65e2001691a07fc67459872f32e98918a8ba7791292198322c6", kill_on_drop: false }` [INFO] [stdout] 8fbaffc95e8eb65e2001691a07fc67459872f32e98918a8ba7791292198322c6