[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 1.55.0 for beta-1.56-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFarteen%2Frust-crates-playing" "/workspace/builds/worker-75/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-75/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Farteen/rust-crates-playing on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-75/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" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded os_info v1.3.3
[INFO] [stderr]   Downloaded bson v0.14.0
[INFO] [stderr]   Downloaded err-derive v0.2.2
[INFO] [stderr]   Downloaded md5 v0.6.1
[INFO] [stderr]   Downloaded trust-dns-resolver v0.18.1
[INFO] [stderr]   Downloaded webpki v0.21.2
[INFO] [stderr]   Downloaded serde_with v1.4.0
[INFO] [stderr]   Downloaded sha2 v0.8.1
[INFO] [stderr]   Downloaded derivative v1.0.3
[INFO] [stderr]   Downloaded aho-corasick v0.7.9
[INFO] [stderr]   Downloaded serde_with_macros v1.1.0
[INFO] [stderr]   Downloaded typed-builder v0.3.0
[INFO] [stderr]   Downloaded trust-dns-proto v0.18.1
[INFO] [stderr]   Downloaded tokio v0.2.12
[INFO] [stderr]   Downloaded ring v0.16.11
[INFO] [stderr]   Downloaded mongodb v0.9.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 92086c2f3e041cd85d9cea067de942c61a45853b4866953568f98dd043f9e189
[INFO] running `Command { std: "docker" "start" "-a" "92086c2f3e041cd85d9cea067de942c61a45853b4866953568f98dd043f9e189", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "92086c2f3e041cd85d9cea067de942c61a45853b4866953568f98dd043f9e189", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92086c2f3e041cd85d9cea067de942c61a45853b4866953568f98dd043f9e189", kill_on_drop: false }`
[INFO] [stdout] 92086c2f3e041cd85d9cea067de942c61a45853b4866953568f98dd043f9e189
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 906037323d0378a397803045ce0830a7d68a0cac77cf5a4250e251bfa5b88d52
[INFO] running `Command { std: "docker" "start" "-a" "906037323d0378a397803045ce0830a7d68a0cac77cf5a4250e251bfa5b88d52", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]    Compiling rustversion v1.0.2
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling proc-macro-nested v0.1.3
[INFO] [stderr]     Checking futures-core v0.3.4
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]     Checking futures-sink v0.3.4
[INFO] [stderr]     Checking smallvec v1.2.0
[INFO] [stderr]     Checking futures-io v0.3.4
[INFO] [stderr]     Checking untrusted v0.7.0
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]     Checking futures-task v0.3.4
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling ryu v1.0.2
[INFO] [stderr]     Checking bytes v0.5.4
[INFO] [stderr]     Checking pin-project-lite v0.1.4
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]     Checking regex-syntax v0.6.14
[INFO] [stderr]    Compiling os_info v1.3.3
[INFO] [stderr]     Checking md5 v0.6.1
[INFO] [stderr]     Checking hex v0.3.2
[INFO] [stderr]     Checking hex v0.4.2
[INFO] [stderr]     Checking bufstream v0.1.4
[INFO] [stderr]     Checking version_check v0.9.1
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling indexmap v1.3.2
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking lru-cache v0.1.2
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]     Checking aho-corasick v0.7.9
[INFO] [stderr]     Checking base64 v0.10.1
[INFO] [stderr]     Checking futures-channel v0.3.4
[INFO] [stderr]     Checking unicode-normalization v0.1.12
[INFO] [stderr]     Checking c2-chacha v0.2.3
[INFO] [stderr]     Checking regex v1.3.4
[INFO] [stderr]    Compiling ring v0.16.11
[INFO] [stderr]    Compiling backtrace-sys v0.1.32
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking socket2 v0.3.11
[INFO] [stderr]     Checking hostname v0.1.5
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking resolv-conf v0.6.2
[INFO] [stderr]     Checking backtrace v0.3.44
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking stringprep v0.1.2
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking chrono v0.4.10
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking crypto-mac v0.7.0
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]     Checking sha2 v0.8.1
[INFO] [stderr]     Checking hmac v0.7.1
[INFO] [stderr]     Checking md-5 v0.8.0
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking pbkdf2 v0.3.0
[INFO] [stderr]     Checking tokio v0.2.12
[INFO] [stderr]     Checking webpki v0.21.2
[INFO] [stderr]     Checking sct v0.6.0
[INFO] [stderr]    Compiling derivative v1.0.3
[INFO] [stderr]    Compiling typed-builder v0.3.0
[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 proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling serde_derive v1.0.104
[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 proc-macro-error-attr v0.4.9
[INFO] [stderr]    Compiling err-derive v0.2.2
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]     Checking failure v0.1.6
[INFO] [stderr]     Checking futures-util v0.3.4
[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]    |     ^^^^^^ expected `()`, found enum `Result`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected unit type `()`
[INFO] [stdout]                    found enum `Result<(), _>`
[INFO] [stdout] help: consider using a semicolon here
[INFO] [stdout]    |
[INFO] [stdout] 38 |     Ok(());
[INFO] [stdout]    |           ^
[INFO] [stdout] help: you might have meant to return this value
[INFO] [stdout]    |
[INFO] [stdout] 38 |     return Ok(());
[INFO] [stdout]    |     ^^^^^^       ^
[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]    |     ^^^^^^ expected `()`, found enum `Result`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected unit type `()`
[INFO] [stdout]                    found enum `Result<(), _>`
[INFO] [stdout] help: consider using a semicolon here
[INFO] [stdout]    |
[INFO] [stdout] 38 |     Ok(());
[INFO] [stdout]    |           ^
[INFO] [stdout] help: you might have meant to return this value
[INFO] [stdout]    |
[INFO] [stdout] 38 |     return Ok(());
[INFO] [stdout]    |     ^^^^^^       ^
[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 `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 `Result`, found `()`
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `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 |     serde::export::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[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |   fn main() -> Result<(), Box<dyn Error>> {
[INFO] [stdout]    |                -------------------------- expected `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 `Result`, found `()`
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `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 |     serde::export::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] [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` due to 4 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "906037323d0378a397803045ce0830a7d68a0cac77cf5a4250e251bfa5b88d52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "906037323d0378a397803045ce0830a7d68a0cac77cf5a4250e251bfa5b88d52", kill_on_drop: false }`
[INFO] [stdout] 906037323d0378a397803045ce0830a7d68a0cac77cf5a4250e251bfa5b88d52
