[INFO] cloning repository https://github.com/Farteen/rust-crates-playing
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Farteen/rust-crates-playing" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFarteen%2Frust-crates-playing", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFarteen%2Frust-crates-playing'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 755edf2c1128cea4cf28c55bea660c8efc714f3f
[INFO] checking Farteen/rust-crates-playing against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFarteen%2Frust-crates-playing" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Farteen/rust-crates-playing on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Farteen/rust-crates-playing
[INFO] finished tweaking git repo https://github.com/Farteen/rust-crates-playing
[INFO] tweaked toml for git repo https://github.com/Farteen/rust-crates-playing written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/Farteen/rust-crates-playing already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dd99e3858e3d590a97fac475a90976e469ecf23d90ff0f4bcfd076fa7c6a3fcd
[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" "dd99e3858e3d590a97fac475a90976e469ecf23d90ff0f4bcfd076fa7c6a3fcd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dd99e3858e3d590a97fac475a90976e469ecf23d90ff0f4bcfd076fa7c6a3fcd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd99e3858e3d590a97fac475a90976e469ecf23d90ff0f4bcfd076fa7c6a3fcd", kill_on_drop: false }`
[INFO] [stdout] dd99e3858e3d590a97fac475a90976e469ecf23d90ff0f4bcfd076fa7c6a3fcd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 52fa3e4573a5b31a40850f96427e2f6805235736f0f498b290fdb96bd9992055
[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" "52fa3e4573a5b31a40850f96427e2f6805235736f0f498b290fdb96bd9992055", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]     Checking futures-core v0.3.4
[INFO] [stderr]     Checking futures-sink v0.3.4
[INFO] [stderr]    Compiling os_info v1.3.3
[INFO] [stderr]     Checking version_check v0.9.1
[INFO] [stderr]    Compiling ring v0.16.11
[INFO] [stderr]     Checking lru-cache v0.1.2
[INFO] [stderr]     Checking hostname v0.1.5
[INFO] [stderr]     Checking socket2 v0.3.11
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking stringprep v0.1.2
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking crypto-mac v0.7.0
[INFO] [stderr]     Checking chrono v0.4.10
[INFO] [stderr]    Compiling typed-builder v0.3.0
[INFO] [stderr]    Compiling derivative v1.0.3
[INFO] [stderr]     Checking tokio v0.2.12
[INFO] [stderr]     Checking futures-channel v0.3.4
[INFO] [stderr]     Checking sha2 v0.8.1
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking md-5 v0.8.0
[INFO] [stderr]     Checking resolv-conf v0.6.2
[INFO] [stderr]     Checking hmac v0.7.1
[INFO] [stderr]     Checking pbkdf2 v0.3.0
[INFO] [stderr]     Checking webpki v0.21.2
[INFO] [stderr]     Checking sct v0.6.0
[INFO] [stderr]     Checking rustls v0.16.0
[INFO] [stderr]     Checking webpki-roots v0.18.0
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling rustversion v1.0.2
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]    Compiling async-trait v0.1.24
[INFO] [stderr]    Compiling enum-as-inner v0.3.1
[INFO] [stderr]    Compiling serde_with_macros v1.1.0
[INFO] [stderr]    Compiling proc-macro-error v0.4.9
[INFO] [stderr]    Compiling err-derive v0.2.2
[INFO] [stderr]    Compiling proc-macro-error-attr v0.4.9
[INFO] [stderr]     Checking failure v0.1.6
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking serde v1.0.104
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]     Checking trust-dns-proto v0.18.1
[INFO] [stderr]     Checking trust-dns-resolver v0.18.1
[INFO] [stderr]     Checking serde_json v1.0.48
[INFO] [stderr]     Checking serde_with v1.4.0
[INFO] [stderr]     Checking bson v0.14.0
[INFO] [stderr]     Checking mongodb v0.9.1
[INFO] [stderr]     Checking toy v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this file contains an unclosed delimiter
[INFO] [stdout]   --> src/main.rs:39:3
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn main() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |                                         - unclosed delimiter
[INFO] [stdout] ...
[INFO] [stdout] 36 |     for db_name in client.list_database_names(None)? {
[INFO] [stdout]    |                                                      - this delimiter might not be properly closed...
[INFO] [stdout] ...
[INFO] [stdout] 39 | }
[INFO] [stdout]    | - ^
[INFO] [stdout]    | |
[INFO] [stdout]    | ...as it matches this but it has different indentation
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this file contains an unclosed delimiter
[INFO] [stdout]   --> src/main.rs:39:3
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn main() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |                                         - unclosed delimiter
[INFO] [stdout] ...
[INFO] [stdout] 36 |     for db_name in client.list_database_names(None)? {
[INFO] [stdout]    |                                                      - this delimiter might not be properly closed...
[INFO] [stdout] ...
[INFO] [stdout] 39 | }
[INFO] [stdout]    | - ^
[INFO] [stdout]    | |
[INFO] [stdout]    | ...as it matches this but it has different indentation
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Cursor`
[INFO] [stdout]  --> src/main.rs:1:47
[INFO] [stdout]   |
[INFO] [stdout] 1 | use mongodb::{Client, options::ClientOptions, Cursor};
[INFO] [stdout]   |                                               ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Cursor`
[INFO] [stdout]  --> src/main.rs:1:47
[INFO] [stdout]   |
[INFO] [stdout] 1 | use mongodb::{Client, options::ClientOptions, Cursor};
[INFO] [stdout]   |                                               ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     Ok(())
[INFO] [stdout]    |     ^^^^^^- help: try adding a semicolon: `;`
[INFO] [stdout]    |     |
[INFO] [stdout]    |     expected `()`, found enum `std::result::Result`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected unit type `()`
[INFO] [stdout]                    found enum `std::result::Result<(), _>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     Ok(())
[INFO] [stdout]    |     ^^^^^^- help: try adding a semicolon: `;`
[INFO] [stdout]    |     |
[INFO] [stdout]    |     expected `()`, found enum `std::result::Result`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected unit type `()`
[INFO] [stdout]                    found enum `std::result::Result<(), _>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |   fn main() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |                -------------------------- expected `std::result::Result<(), Box<(dyn StdError + 'static)>>` because of return type
[INFO] [stdout] ...
[INFO] [stdout] 36 | /     for db_name in client.list_database_names(None)? {
[INFO] [stdout] 37 | |         println!("{}", db_name);
[INFO] [stdout] 38 | |     Ok(())
[INFO] [stdout] 39 | | }
[INFO] [stdout]    | |_^ expected enum `std::result::Result`, found `()`
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `std::result::Result<(), Box<(dyn StdError + 'static)>>`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] help: try using a variant of the expected enum
[INFO] [stdout]    |
[INFO] [stdout] 36 |     Ok(for db_name in client.list_database_names(None)? {
[INFO] [stdout] 37 |         println!("{}", db_name);
[INFO] [stdout] 38 |     Ok(())
[INFO] [stdout] 39 | })
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `toy`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |   fn main() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |                -------------------------- expected `std::result::Result<(), Box<(dyn StdError + 'static)>>` because of return type
[INFO] [stdout] ...
[INFO] [stdout] 36 | /     for db_name in client.list_database_names(None)? {
[INFO] [stdout] 37 | |         println!("{}", db_name);
[INFO] [stdout] 38 | |     Ok(())
[INFO] [stdout] 39 | | }
[INFO] [stdout]    | |_^ expected enum `std::result::Result`, found `()`
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `std::result::Result<(), Box<(dyn StdError + 'static)>>`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] help: try using a variant of the expected enum
[INFO] [stdout]    |
[INFO] [stdout] 36 |     Ok(for db_name in client.list_database_names(None)? {
[INFO] [stdout] 37 |         println!("{}", db_name);
[INFO] [stdout] 38 |     Ok(())
[INFO] [stdout] 39 | })
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "52fa3e4573a5b31a40850f96427e2f6805235736f0f498b290fdb96bd9992055", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52fa3e4573a5b31a40850f96427e2f6805235736f0f498b290fdb96bd9992055", kill_on_drop: false }`
[INFO] [stdout] 52fa3e4573a5b31a40850f96427e2f6805235736f0f498b290fdb96bd9992055