[INFO] cloning repository https://github.com/CorneliaKelinske/rustlings_meetup
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CorneliaKelinske/rustlings_meetup" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCorneliaKelinske%2Frustlings_meetup", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCorneliaKelinske%2Frustlings_meetup'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 96be19ef0ee679fe95a6c0bd18d886cc6e4ac2f1
[INFO] checking CorneliaKelinske/rustlings_meetup against master#cf8a95590a1b768b7711f2631d5b5e3ead464de7 for pr-149389
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCorneliaKelinske%2Frustlings_meetup" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/CorneliaKelinske/rustlings_meetup
[INFO] finished tweaking git repo https://github.com/CorneliaKelinske/rustlings_meetup
[INFO] tweaked toml for git repo https://github.com/CorneliaKelinske/rustlings_meetup written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/CorneliaKelinske/rustlings_meetup on toolchain cf8a95590a1b768b7711f2631d5b5e3ead464de7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf8a95590a1b768b7711f2631d5b5e3ead464de7" "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" "+cf8a95590a1b768b7711f2631d5b5e3ead464de7" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf8a95590a1b768b7711f2631d5b5e3ead464de7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+cf8a95590a1b768b7711f2631d5b5e3ead464de7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b79a384cf5ad4698abc5fa1f8c5d2684c92b272f7c4ecc8a12a8fa6526bed29b
[INFO] running `Command { std: "docker" "start" "-a" "b79a384cf5ad4698abc5fa1f8c5d2684c92b272f7c4ecc8a12a8fa6526bed29b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b79a384cf5ad4698abc5fa1f8c5d2684c92b272f7c4ecc8a12a8fa6526bed29b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b79a384cf5ad4698abc5fa1f8c5d2684c92b272f7c4ecc8a12a8fa6526bed29b", kill_on_drop: false }`
[INFO] [stdout] b79a384cf5ad4698abc5fa1f8c5d2684c92b272f7c4ecc8a12a8fa6526bed29b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+cf8a95590a1b768b7711f2631d5b5e3ead464de7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 211a431ce2ed382204778e3328d777f6b3c911b8ebe153c2d2a9573f3b08130a
[INFO] running `Command { std: "docker" "start" "-a" "211a431ce2ed382204778e3328d777f6b3c911b8ebe153c2d2a9573f3b08130a", kill_on_drop: false }`
[INFO] [stderr]     Checking exercises v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0308]: `if` and `else` have incompatible types
[INFO] [stdout]   --> exercises/03_if/if3.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout]  7 |       } else if animal == "snake" {
[INFO] [stdout]    |  ____________-
[INFO] [stdout]  8 | |         3
[INFO] [stdout]    | |         - expected because of this
[INFO] [stdout]  9 | |     } else {
[INFO] [stdout] 10 | |         "Unknown"
[INFO] [stdout]    | |         ^^^^^^^^^ expected integer, found `&str`
[INFO] [stdout] 11 | |     };
[INFO] [stdout]    | |_____- `if` and `else` have incompatible types
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exercises` (bin "if3") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: enum `CreationError` is never used
[INFO] [stdout]  --> exercises/13_error_handling/errors4.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum CreationError {
[INFO] [stdout]   |      ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PositiveNonzeroInteger` is never constructed
[INFO] [stdout]   --> exercises/13_error_handling/errors4.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct PositiveNonzeroInteger(u64);
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> exercises/13_error_handling/errors4.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl PositiveNonzeroInteger {
[INFO] [stdout]    | --------------------------- associated function in this implementation
[INFO] [stdout] 13 |     fn new(value: i64) -> Result<Self, CreationError> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> exercises/13_error_handling/errors5.rs:53:44
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn main() {
[INFO] [stdout]    | --------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] 52 |     let pretend_user_input = "42";
[INFO] [stdout] 53 |     let x: i64 = pretend_user_input.parse()?;
[INFO] [stdout]    |                                            ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn main() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |           +++++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> exercises/13_error_handling/errors5.rs:54:59
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn main() {
[INFO] [stdout]    | --------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 54 |     println!("output={:?}", PositiveNonzeroInteger::new(x)?);
[INFO] [stdout]    |                                                           ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn main() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |           +++++++++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0499]: cannot borrow `x` as mutable more than once at a time
[INFO] [stdout]   --> exercises/06_move_semantics/move_semantics4.rs:13:17
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let y = &mut x;
[INFO] [stdout]    |                 ------ first mutable borrow occurs here
[INFO] [stdout] 13 |         let z = &mut x;
[INFO] [stdout]    |                 ^^^^^^ second mutable borrow occurs here
[INFO] [stdout] 14 |         y.push(42);
[INFO] [stdout]    |         - first borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0499`.
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]  --> exercises/02_functions/functions5.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn square(num: i32) -> i32 {
[INFO] [stdout]   |    ------              ^^^ expected `i32`, found `()`
[INFO] [stdout]   |    |
[INFO] [stdout]   |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout] 3 |     num * num;
[INFO] [stdout]   |              - help: remove this semicolon to return this value
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]  --> exercises/09_strings/strings3.rs:1:28
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn trim_me(input: &str) -> &str {
[INFO] [stdout]   |    -------                 ^^^^ expected `&str`, found `()`
[INFO] [stdout]   |    |
[INFO] [stdout]   |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]   |
[INFO] [stdout] help: consider returning the local binding `input`
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn trim_me(input: &str) -> &str {
[INFO] [stdout] 2 ~     input
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exercises` (bin "move_semantics4" test) due to 1 previous error
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]  --> exercises/09_strings/strings3.rs:5:31
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn compose_me(input: &str) -> String {
[INFO] [stdout]   |    ----------                 ^^^^^^ expected `String`, found `()`
[INFO] [stdout]   |    |
[INFO] [stdout]   |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]  --> exercises/09_strings/strings3.rs:9:31
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn replace_me(input: &str) -> String {
[INFO] [stdout]   |    ----------                 ^^^^^^ expected `String`, found `()`
[INFO] [stdout]   |    |
[INFO] [stdout]   |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exercises` (bin "functions5" test) due to 1 previous error
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> exercises/13_error_handling/errors5.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn main() {
[INFO] [stdout]    |          - expected `()` because of default return type
[INFO] [stdout] ...
[INFO] [stdout] 55 |     Ok(())
[INFO] [stdout]    |     ^^^^^^ expected `()`, found `Result<(), _>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected unit type `()`
[INFO] [stdout]                    found enum `Result<(), _>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exercises` (bin "strings3" test) due to 3 previous errors
[INFO] [stdout] Some errors have detailed explanations: E0277, E0308.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exercises` (bin "errors5") due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "211a431ce2ed382204778e3328d777f6b3c911b8ebe153c2d2a9573f3b08130a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "211a431ce2ed382204778e3328d777f6b3c911b8ebe153c2d2a9573f3b08130a", kill_on_drop: false }`
[INFO] [stdout] 211a431ce2ed382204778e3328d777f6b3c911b8ebe153c2d2a9573f3b08130a
