[INFO] cloning repository https://github.com/OrangeDrangon/grader [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/OrangeDrangon/grader" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FOrangeDrangon%2Fgrader", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FOrangeDrangon%2Fgrader'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 6b0a58d16af42d03568f30b679b22021f98244c9 [INFO] checking OrangeDrangon/grader against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FOrangeDrangon%2Fgrader" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/OrangeDrangon/grader on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/OrangeDrangon/grader [INFO] finished tweaking git repo https://github.com/OrangeDrangon/grader [INFO] tweaked toml for git repo https://github.com/OrangeDrangon/grader written to /workspace/builds/worker-3-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/OrangeDrangon/grader 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Updating git repository `https://gitlab.com/kylerosenberg/canvasapi` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded dialoguer v0.10.2 [INFO] [stderr] Downloaded zip-extract v0.1.1 [INFO] [stderr] Downloaded tokio v1.21.0 [INFO] [stderr] Downloaded openssl-src v111.22.0+1.1.1q [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 5d7d8d240a717cc5a86470beed7dcf7b0ee2e06e837dc08df3e46067e37cbf88 [INFO] running `Command { std: "docker" "start" "-a" "5d7d8d240a717cc5a86470beed7dcf7b0ee2e06e837dc08df3e46067e37cbf88", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "5d7d8d240a717cc5a86470beed7dcf7b0ee2e06e837dc08df3e46067e37cbf88", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5d7d8d240a717cc5a86470beed7dcf7b0ee2e06e837dc08df3e46067e37cbf88", kill_on_drop: false }` [INFO] [stdout] 5d7d8d240a717cc5a86470beed7dcf7b0ee2e06e837dc08df3e46067e37cbf88 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] e0272729c5f8f2046f112c8607df4627c1cb78551c9320309f7396800ce40627 [INFO] running `Command { std: "docker" "start" "-a" "e0272729c5f8f2046f112c8607df4627c1cb78551c9320309f7396800ce40627", kill_on_drop: false }` [INFO] [stderr] Compiling syn v1.0.99 [INFO] [stderr] Compiling pkg-config v0.3.25 [INFO] [stderr] Checking once_cell v1.14.0 [INFO] [stderr] Compiling log v0.4.17 [INFO] [stderr] Compiling futures-core v0.3.24 [INFO] [stderr] Compiling openssl-src v111.22.0+1.1.1q [INFO] [stderr] Compiling lock_api v0.4.8 [INFO] [stderr] Checking futures-sink v0.3.24 [INFO] [stderr] Compiling futures-task v0.3.24 [INFO] [stderr] Compiling futures-channel v0.3.24 [INFO] [stderr] Checking parking_lot_core v0.9.3 [INFO] [stderr] Compiling tokio v1.21.0 [INFO] [stderr] Compiling futures-util v0.3.24 [INFO] [stderr] Checking mio v0.8.4 [INFO] [stderr] Checking signal-hook-registry v1.4.0 [INFO] [stderr] Checking parking_lot v0.12.1 [INFO] [stderr] Checking socket2 v0.4.7 [INFO] [stderr] Checking num_cpus v1.13.1 [INFO] [stderr] Checking futures-io v0.3.24 [INFO] [stderr] Checking tracing-core v0.1.29 [INFO] [stderr] Compiling openssl-sys v0.9.75 [INFO] [stderr] Compiling openssl v0.10.41 [INFO] [stderr] Compiling native-tls v0.2.10 [INFO] [stderr] Compiling bzip2-sys v0.1.11+1.0.8 [INFO] [stderr] Checking iovec v0.1.4 [INFO] [stderr] Checking percent-encoding v2.2.0 [INFO] [stderr] Checking want v0.3.0 [INFO] [stderr] Checking form_urlencoded v1.1.0 [INFO] [stderr] Checking bytes v0.4.12 [INFO] [stderr] Compiling encoding_rs v0.8.31 [INFO] [stderr] Checking futures v0.1.31 [INFO] [stderr] Compiling rustversion v1.0.9 [INFO] [stderr] Checking tracing v0.1.36 [INFO] [stderr] Checking idna v0.3.0 [INFO] [stderr] Checking miniz_oxide v0.5.4 [INFO] [stderr] Compiling anyhow v1.0.64 [INFO] [stderr] Checking flate2 v1.0.24 [INFO] [stderr] Checking url v2.3.1 [INFO] [stderr] Checking thread_local v1.1.4 [INFO] [stderr] Checking time v0.1.44 [INFO] [stderr] Checking terminal_size v0.1.17 [INFO] [stderr] Checking unicode-width v0.1.9 [INFO] [stderr] Compiling heck v0.4.0 [INFO] [stderr] Checking mime v0.3.16 [INFO] [stderr] Checking fastrand v1.8.0 [INFO] [stderr] Checking tokio-io v0.1.13 [INFO] [stderr] Checking ipnet v2.5.0 [INFO] [stderr] Checking console v0.15.1 [INFO] [stderr] Checking tempfile v3.3.0 [INFO] [stderr] Checking fuzzy-matcher v0.3.7 [INFO] [stderr] Checking bzip2 v0.4.3 [INFO] [stderr] Checking aho-corasick v0.7.19 [INFO] [stderr] Checking atty v0.2.14 [INFO] [stderr] Checking zeroize v1.5.7 [INFO] [stderr] Checking colored v2.0.0 [INFO] [stderr] Checking dialoguer v0.10.2 [INFO] [stderr] Checking regex v1.6.0 [INFO] [stderr] Compiling tokio-macros v1.8.0 [INFO] [stderr] Compiling futures-macro v0.3.24 [INFO] [stderr] Compiling openssl-macros v0.1.0 [INFO] [stderr] Compiling serde_derive v1.0.144 [INFO] [stderr] Compiling thiserror-impl v1.0.34 [INFO] [stderr] Compiling strum_macros v0.24.3 [INFO] [stderr] Checking thiserror v1.0.34 [INFO] [stderr] Checking zip v0.5.13 [INFO] [stderr] Checking strum v0.24.1 [INFO] [stderr] Checking zip-extract v0.1.1 [INFO] [stderr] Checking futures-executor v0.3.24 [INFO] [stderr] Checking futures v0.3.24 [INFO] [stderr] Checking tokio-util v0.7.4 [INFO] [stderr] Checking serde v1.0.144 [INFO] [stderr] Checking h2 v0.3.14 [INFO] [stderr] Checking hyper v0.14.20 [INFO] [stderr] Checking serde_json v1.0.85 [INFO] [stderr] Checking serde_urlencoded v0.7.1 [INFO] [stderr] Checking tokio-native-tls v0.3.0 [INFO] [stderr] Checking hyper-tls v0.5.0 [INFO] [stderr] Checking reqwest v0.11.11 [INFO] [stderr] Checking canvasapi v0.3.0 (https://gitlab.com/kylerosenberg/canvasapi#d9773052) [INFO] [stderr] Checking grader v1.0.4 (/opt/rustwide/workdir) [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 32s [INFO] running `Command { std: "docker" "inspect" "e0272729c5f8f2046f112c8607df4627c1cb78551c9320309f7396800ce40627", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "e0272729c5f8f2046f112c8607df4627c1cb78551c9320309f7396800ce40627", kill_on_drop: false }` [INFO] [stdout] e0272729c5f8f2046f112c8607df4627c1cb78551c9320309f7396800ce40627 [INFO] checking OrangeDrangon/grader against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FOrangeDrangon%2Fgrader" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/OrangeDrangon/grader on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/OrangeDrangon/grader [INFO] finished tweaking git repo https://github.com/OrangeDrangon/grader [INFO] tweaked toml for git repo https://github.com/OrangeDrangon/grader written to /workspace/builds/worker-3-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/OrangeDrangon/grader 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 9a8706cc7a903420669d5467de853f361663a03a05f6632a46b32fc30bc81d50 [INFO] running `Command { std: "docker" "start" "-a" "9a8706cc7a903420669d5467de853f361663a03a05f6632a46b32fc30bc81d50", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "9a8706cc7a903420669d5467de853f361663a03a05f6632a46b32fc30bc81d50", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "9a8706cc7a903420669d5467de853f361663a03a05f6632a46b32fc30bc81d50", kill_on_drop: false }` [INFO] [stdout] 9a8706cc7a903420669d5467de853f361663a03a05f6632a46b32fc30bc81d50 [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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 4f19924dbefa40443c4800dbff5edc28e0cb5871f7dc42b95347f4b3bc72f3ea [INFO] running `Command { std: "docker" "start" "-a" "4f19924dbefa40443c4800dbff5edc28e0cb5871f7dc42b95347f4b3bc72f3ea", kill_on_drop: false }` [INFO] [stderr] Compiling syn v1.0.99 [INFO] [stderr] Compiling pkg-config v0.3.25 [INFO] [stderr] Checking once_cell v1.14.0 [INFO] [stderr] Compiling log v0.4.17 [INFO] [stderr] Compiling futures-core v0.3.24 [INFO] [stderr] Compiling lock_api v0.4.8 [INFO] [stderr] Compiling openssl-src v111.22.0+1.1.1q [INFO] [stderr] Checking futures-sink v0.3.24 [INFO] [stderr] Compiling futures-task v0.3.24 [INFO] [stderr] Compiling futures-channel v0.3.24 [INFO] [stderr] Checking parking_lot_core v0.9.3 [INFO] [stderr] Compiling tokio v1.21.0 [INFO] [stderr] Compiling futures-util v0.3.24 [INFO] [stderr] Checking mio v0.8.4 [INFO] [stderr] Checking signal-hook-registry v1.4.0 [INFO] [stderr] Checking socket2 v0.4.7 [INFO] [stderr] Checking parking_lot v0.12.1 [INFO] [stderr] Checking num_cpus v1.13.1 [INFO] [stderr] Checking futures-io v0.3.24 [INFO] [stderr] Checking tracing-core v0.1.29 [INFO] [stderr] Compiling openssl v0.10.41 [INFO] [stderr] Compiling openssl-sys v0.9.75 [INFO] [stderr] Compiling native-tls v0.2.10 [INFO] [stderr] Compiling bzip2-sys v0.1.11+1.0.8 [INFO] [stderr] Checking iovec v0.1.4 [INFO] [stderr] Checking percent-encoding v2.2.0 [INFO] [stderr] Checking want v0.3.0 [INFO] [stderr] Checking form_urlencoded v1.1.0 [INFO] [stderr] Checking bytes v0.4.12 [INFO] [stderr] Compiling encoding_rs v0.8.31 [INFO] [stderr] Checking tracing v0.1.36 [INFO] [stderr] Checking futures v0.1.31 [INFO] [stderr] Compiling rustversion v1.0.9 [INFO] [stderr] Checking miniz_oxide v0.5.4 [INFO] [stderr] Checking idna v0.3.0 [INFO] [stderr] Compiling anyhow v1.0.64 [INFO] [stderr] Checking flate2 v1.0.24 [INFO] [stderr] Checking url v2.3.1 [INFO] [stderr] Checking tokio-io v0.1.13 [INFO] [stderr] Checking thread_local v1.1.4 [INFO] [stderr] Checking terminal_size v0.1.17 [INFO] [stderr] Checking time v0.1.44 [INFO] [stderr] Checking ipnet v2.5.0 [INFO] [stderr] Checking fastrand v1.8.0 [INFO] [stderr] Checking mime v0.3.16 [INFO] [stderr] Checking bzip2 v0.4.3 [INFO] [stderr] Checking unicode-width v0.1.9 [INFO] [stderr] Compiling heck v0.4.0 [INFO] [stderr] Checking console v0.15.1 [INFO] [stderr] Checking tempfile v3.3.0 [INFO] [stderr] Checking fuzzy-matcher v0.3.7 [INFO] [stderr] Checking aho-corasick v0.7.19 [INFO] [stderr] Checking atty v0.2.14 [INFO] [stderr] Checking zeroize v1.5.7 [INFO] [stderr] Checking colored v2.0.0 [INFO] [stderr] Checking dialoguer v0.10.2 [INFO] [stderr] Checking regex v1.6.0 [INFO] [stderr] Compiling tokio-macros v1.8.0 [INFO] [stderr] Compiling futures-macro v0.3.24 [INFO] [stderr] Compiling openssl-macros v0.1.0 [INFO] [stderr] Compiling serde_derive v1.0.144 [INFO] [stderr] Compiling thiserror-impl v1.0.34 [INFO] [stderr] Compiling strum_macros v0.24.3 [INFO] [stderr] Checking thiserror v1.0.34 [INFO] [stderr] Checking zip v0.5.13 [INFO] [stderr] Checking strum v0.24.1 [INFO] [stderr] Checking zip-extract v0.1.1 [INFO] [stderr] Checking futures-executor v0.3.24 [INFO] [stderr] Checking futures v0.3.24 [INFO] [stderr] Checking tokio-util v0.7.4 [INFO] [stderr] Checking serde v1.0.144 [INFO] [stderr] Checking h2 v0.3.14 [INFO] [stderr] Checking hyper v0.14.20 [INFO] [stderr] Checking serde_urlencoded v0.7.1 [INFO] [stderr] Checking serde_json v1.0.85 [INFO] [stderr] Checking tokio-native-tls v0.3.0 [INFO] [stderr] Checking hyper-tls v0.5.0 [INFO] [stderr] Checking reqwest v0.11.11 [INFO] [stderr] Checking canvasapi v0.3.0 (https://gitlab.com/kylerosenberg/canvasapi#d9773052) [INFO] [stderr] Checking grader v1.0.4 (/opt/rustwide/workdir) [INFO] [stdout] error[E0277]: a value of type `!` cannot be built from an iterator over elements of type `()` [INFO] [stdout] --> src/main.rs:130:24 [INFO] [stdout] | [INFO] [stdout] 130 | .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 `!`, which is required by `Result<_, _>: FromIterator>>` [INFO] [stdout] = help: the trait `FromIterator>` is implemented for `Result` [INFO] [stdout] = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 for more information) [INFO] [stdout] = help: did you intend to use the type `()` here instead? [INFO] [stdout] = note: required for `Result>` to implement `FromIterator>>` [INFO] [stdout] note: required by a bound in `std::iter::Iterator::collect` [INFO] [stdout] --> /rustc/2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2/library/core/src/iter/traits/iterator.rs:1999:5 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0277]: a value of type `!` cannot be built from an iterator over elements of type `()` [INFO] [stdout] --> src/main.rs:130:24 [INFO] [stdout] | [INFO] [stdout] 130 | .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 `!`, which is required by `Result<_, _>: FromIterator>>` [INFO] [stdout] = help: the trait `FromIterator>` is implemented for `Result` [INFO] [stdout] = note: this error might have been caused by changes to Rust's type-inference algorithm (see issue #48950 for more information) [INFO] [stdout] = help: did you intend to use the type `()` here instead? [INFO] [stdout] = note: required for `Result>` to implement `FromIterator>>` [INFO] [stdout] note: required by a bound in `std::iter::Iterator::collect` [INFO] [stdout] --> /rustc/2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2/library/core/src/iter/traits/iterator.rs:1999:5 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 1 previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 1 previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0277`. [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0277`. [INFO] [stdout] [INFO] [stderr] error: could not compile `grader` (bin "grader" test) due to 2 previous errors [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] error: could not compile `grader` (bin "grader") due to 2 previous errors [INFO] running `Command { std: "docker" "inspect" "4f19924dbefa40443c4800dbff5edc28e0cb5871f7dc42b95347f4b3bc72f3ea", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "4f19924dbefa40443c4800dbff5edc28e0cb5871f7dc42b95347f4b3bc72f3ea", kill_on_drop: false }` [INFO] [stdout] 4f19924dbefa40443c4800dbff5edc28e0cb5871f7dc42b95347f4b3bc72f3ea