[INFO] cloning repository https://github.com/jfeldman325/Rust-Learning-Examples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jfeldman325/Rust-Learning-Examples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjfeldman325%2FRust-Learning-Examples", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjfeldman325%2FRust-Learning-Examples'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b32ce13aa45e32e6b5473a7ae44a9897c30e6af0
[INFO] checking jfeldman325/Rust-Learning-Examples/b32ce13aa45e32e6b5473a7ae44a9897c30e6af0 against master#733108b6d4acaa93fe26ae281ea305aacd6aac4e for pr-148967
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjfeldman325%2FRust-Learning-Examples" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jfeldman325/Rust-Learning-Examples
[INFO] finished tweaking git repo https://github.com/jfeldman325/Rust-Learning-Examples
[INFO] tweaked toml for git repo https://github.com/jfeldman325/Rust-Learning-Examples written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jfeldman325/Rust-Learning-Examples on toolchain 733108b6d4acaa93fe26ae281ea305aacd6aac4e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+733108b6d4acaa93fe26ae281ea305aacd6aac4e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jfeldman325/Rust-Learning-Examples 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" "+733108b6d4acaa93fe26ae281ea305aacd6aac4e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+733108b6d4acaa93fe26ae281ea305aacd6aac4e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+733108b6d4acaa93fe26ae281ea305aacd6aac4e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
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[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling byteorder v1.3.4
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[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]    Compiling rayon-core v1.7.0
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking num_cpus v1.12.0
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
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[INFO] [stderr]     Checking csv-core v0.1.10
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[INFO] [stderr]     Checking regex-syntax v0.6.17
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking oorandom v11.1.0
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking rayon v1.3.0
[INFO] [stderr]     Checking criterion-plot v0.4.1
[INFO] [stderr]     Checking plotters v0.2.12
[INFO] [stderr]     Checking minigrep v0.1.0 (/opt/rustwide/workdir/minigrep)
[INFO] [stderr]     Checking smart_pointers v0.1.0 (/opt/rustwide/workdir/smart_pointers)
[INFO] [stdout] warning: type `Rc_List` should have an upper camel case name
[INFO] [stdout]   --> smart_pointers/src/main.rs:68:6
[INFO] [stdout]    |
[INFO] [stdout] 68 | enum Rc_List {
[INFO] [stdout]    |      ^^^^^^^ help: convert the identifier to upper camel case: `RcList`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rc_Cons` should have an upper camel case name
[INFO] [stdout]   --> smart_pointers/src/main.rs:69:5
[INFO] [stdout]    |
[INFO] [stdout] 69 |     Rc_Cons(RefCell<i32>, Rc<Rc_List>),
[INFO] [stdout]    |     ^^^^^^^ help: convert the identifier to upper camel case: `RcCons`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Rc_Nil` should have an upper camel case name
[INFO] [stdout]   --> smart_pointers/src/main.rs:70:5
[INFO] [stdout]    |
[INFO] [stdout] 70 |     Rc_Nil,
[INFO] [stdout]    |     ^^^^^^ help: convert the identifier to upper camel case: `RcNil`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> smart_pointers/src/main.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> smart_pointers/src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let x = 5;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> smart_pointers/src/main.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let b = Cons(3, Box::new(a));
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b_rc`
[INFO] [stdout]   --> smart_pointers/src/main.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let b_rc = Rc_Cons(RefCell::new(3), Rc::clone(&a_rc));
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_b_rc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c_rc`
[INFO] [stdout]   --> smart_pointers/src/main.rs:41:13
[INFO] [stdout]    |
[INFO] [stdout] 41 |         let c_rc = Rc_Cons(RefCell::new(4), Rc::clone(&a_rc));
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_c_rc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> smart_pointers/src/main.rs:55:24
[INFO] [stdout]    |
[INFO] [stdout] 55 |         Rc_Cons(value, list) => *value.borrow_mut() += 10,
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> smart_pointers/src/main.rs:63:10
[INFO] [stdout]    |
[INFO] [stdout] 63 |     Cons(i32, Box<List>),
[INFO] [stdout]    |     ---- ^^^  ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 63 -     Cons(i32, Box<List>),
[INFO] [stdout] 63 +     Cons((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking Enums v0.1.0 (/opt/rustwide/workdir/enums)
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]   --> enums/src/main.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 40 |     let four = IpaddrKind::V4;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]   --> enums/src/main.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let six = IpaddrKind::V6;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `version` and `address` are never read
[INFO] [stdout]  --> enums/src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct IpAddr {
[INFO] [stdout]   |        ------ fields in this struct
[INFO] [stdout] 7 |     version: IpaddrKind,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 8 |     address: String,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new_v6` is never used
[INFO] [stdout]   --> enums/src/main.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl IpAddr {
[INFO] [stdout]    | ----------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 34 |     fn new_v6(address: String, mask: Option<String>) -> IpAddr {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking iterators v0.1.0 (/opt/rustwide/workdir/iterators)
[INFO] [stderr]     Checking regex v1.3.5
[INFO] [stdout] error[E0599]: no method named `iter_mut` found for struct `Counter` in the current scope
[INFO] [stdout]   --> iterators/src/main.rs:27:32
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let counter_iter = counter.iter_mut();
[INFO] [stdout]    |                                ^^^^^^^^ method not found in `Counter`
[INFO] [stdout] ...
[INFO] [stdout] 30 | struct Counter {
[INFO] [stdout]    | -------------- method `iter_mut` not found for this struct
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `iterators` (bin "iterators" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "9d4ca4ade1d7f3df0b663e8cc1b6bb25d7b80415331313fafd5df096183d9ed6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d4ca4ade1d7f3df0b663e8cc1b6bb25d7b80415331313fafd5df096183d9ed6", kill_on_drop: false }`
[INFO] [stdout] 9d4ca4ade1d7f3df0b663e8cc1b6bb25d7b80415331313fafd5df096183d9ed6