[INFO] cloning repository https://github.com/Nov11/rust-pl [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Nov11/rust-pl" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNov11%2Frust-pl", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNov11%2Frust-pl'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 0a7cf494b601889c42daf4e23e78245e01117607 [INFO] checking Nov11/rust-pl/0a7cf494b601889c42daf4e23e78245e01117607 against master#f609b7e0586f81fefb3523e3e17adf779ac416be for pr-129466-2 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNov11%2Frust-pl" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/Nov11/rust-pl on toolchain f609b7e0586f81fefb3523e3e17adf779ac416be [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/Nov11/rust-pl [INFO] finished tweaking git repo https://github.com/Nov11/rust-pl [INFO] tweaked toml for git repo https://github.com/Nov11/rust-pl written to /workspace/builds/worker-4-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/Nov11/rust-pl 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" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Downloading crates ... 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[stderr] Downloaded num-integer v0.1.41 [INFO] [stderr] Downloaded num v0.1.42 [INFO] [stderr] Downloaded num-traits v0.1.43 [INFO] [stderr] Downloaded autocfg v0.1.7 [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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] c85e8b1d1aab8299890c69f4df9bea438d9642c0b5e2f955026baf82231a02be [INFO] running `Command { std: "docker" "start" "-a" "c85e8b1d1aab8299890c69f4df9bea438d9642c0b5e2f955026baf82231a02be", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "c85e8b1d1aab8299890c69f4df9bea438d9642c0b5e2f955026baf82231a02be", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "c85e8b1d1aab8299890c69f4df9bea438d9642c0b5e2f955026baf82231a02be", kill_on_drop: false }` [INFO] [stdout] c85e8b1d1aab8299890c69f4df9bea438d9642c0b5e2f955026baf82231a02be [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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 924e7c7796b4aca9674367505020a386b1b63c5ceafbbed7b6c0ec3ff8dc5ef3 [INFO] running `Command { std: "docker" "start" "-a" "924e7c7796b4aca9674367505020a386b1b63c5ceafbbed7b6c0ec3ff8dc5ef3", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.65 [INFO] [stderr] Compiling autocfg v0.1.7 [INFO] [stderr] Compiling byteorder v1.3.2 [INFO] [stderr] Checking rustc-serialize v0.3.24 [INFO] [stderr] Compiling semver-parser v0.7.0 [INFO] [stderr] Checking traitobject v0.1.0 [INFO] [stderr] Compiling log v0.4.8 [INFO] [stderr] Compiling version_check v0.1.5 [INFO] [stderr] Compiling arrayvec v0.4.12 [INFO] [stderr] Compiling httparse v1.3.4 [INFO] [stderr] Checking nodrop v0.1.14 [INFO] [stderr] Checking percent-encoding v1.0.1 [INFO] [stderr] Checking crossbeam-utils v0.6.6 [INFO] [stderr] Checking safemem v0.3.3 [INFO] [stderr] Checking idna v0.1.5 [INFO] [stderr] Checking typeable v0.1.2 [INFO] [stderr] Checking scopeguard v1.0.0 [INFO] [stderr] Checking unsafe-any v0.4.2 [INFO] [stderr] Checking rand_core v0.4.2 [INFO] [stderr] Checking language-tags v0.2.2 [INFO] [stderr] Checking error v0.1.9 [INFO] [stderr] Compiling rayon-core v1.6.0 [INFO] [stderr] Compiling semver v0.9.0 [INFO] [stderr] Checking typemap v0.3.3 [INFO] [stderr] Checking lazy_static v0.2.11 [INFO] [stderr] Checking rand_core v0.3.1 [INFO] [stdout] error[E0310]: the parameter type `T` may not live long enough [INFO] [stdout] --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/rustc-serialize-0.3.24/src/serialize.rs:1155:5 [INFO] [stdout] | [INFO] [stdout] 1155 | fn decode(d: &mut D) -> Result, D::Error> { [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | the parameter type `T` must be valid for the static lifetime... [INFO] [stdout] | ...so that the type `T` will meet its required lifetime bounds... [INFO] [stdout] | [INFO] [stdout] note: ...that is required by this bound [INFO] [stdout] --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/alloc/src/borrow.rs:179:30 [INFO] [stdout] help: consider adding an explicit lifetime bound [INFO] [stdout] | [INFO] [stdout] 1151 | impl<'a, T: ?Sized + 'static> Decodable for Cow<'a, T> [INFO] [stdout] | +++++++++ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking modifier v0.1.0 [INFO] [stderr] Checking crossbeam-queue v0.1.2 [INFO] [stderr] Compiling unicase v1.4.2 [INFO] [stderr] Checking dtoa v0.2.2 [INFO] [stderr] Checking either v1.5.3 [INFO] [stderr] Checking serde v0.8.23 [INFO] [stderr] Checking plugin v0.2.6 [INFO] [stderr] Checking log v0.3.9 [INFO] [stderr] Checking itoa v0.1.1 [INFO] [stderr] Compiling num-traits v0.2.8 [INFO] [stderr] Compiling num-integer v0.1.41 [INFO] [stderr] Compiling rustc_version v0.2.3 [INFO] [stderr] Compiling num-iter v0.1.39 [INFO] [stderr] Checking adler32 v1.0.4 [INFO] [stderr] Checking lzw v0.10.0 [INFO] [stderr] Checking mime v0.2.6 [INFO] [stderr] Checking color_quant v1.0.1 [INFO] [stderr] Checking url v1.7.2 [INFO] [stderr] Checking inflate v0.2.0 [INFO] [stderr] Checking bitflags v0.7.0 [INFO] [stderr] Checking scoped_threadpool v0.1.9 [INFO] [stderr] Checking route-recognizer v0.1.13 [INFO] [stderr] Checking base64 v0.9.3 [INFO] [stderr] Checking deflate v0.7.20 [INFO] [stderr] Checking gif v0.9.2 [INFO] [stderr] Checking crossbeam v0.2.12 [INFO] [stderr] Checking state-pattern v0.1.0 (/opt/rustwide/workdir/state-pattern) [INFO] [stderr] Compiling memoffset v0.5.1 [INFO] [stderr] Checking minigrep v0.1.0 (/opt/rustwide/workdir/minigrep) [INFO] [stdout] warning: unused variable: `post` [INFO] [stdout] --> state-pattern/src/lib.rs:38:27 [INFO] [stdout] | [INFO] [stdout] 38 | fn content<'a>(&self, post: &'a Post) -> &'a str { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_post` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking ch20 v0.1.0 (/opt/rustwide/workdir/ch20) [INFO] [stderr] Checking ch19 v0.1.0 (/opt/rustwide/workdir/ch19) [INFO] [stdout] warning: unused variable: `rhs` [INFO] [stdout] --> ch19/src/main.rs:18:18 [INFO] [stdout] | [INFO] [stdout] 18 | fn add(self, rhs: Self) -> Self::Output { [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_rhs` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: trait `Add` is never used [INFO] [stdout] --> ch19/src/main.rs:6:7 [INFO] [stdout] | [INFO] [stdout] 6 | trait Add { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `A` is never constructed [INFO] [stdout] --> ch19/src/main.rs:12:8 [INFO] [stdout] | [INFO] [stdout] 12 | struct A { [INFO] [stdout] | ^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `return_fn` is never used [INFO] [stdout] --> ch19/src/main.rs:23:4 [INFO] [stdout] | [INFO] [stdout] 23 | fn return_fn() -> Box i32>{ [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking box-usage v0.1.0 (/opt/rustwide/workdir/box-usage) [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking closures v0.1.0 (/opt/rustwide/workdir/closures) [INFO] [stdout] warning: unused variable: `list` [INFO] [stdout] --> box-usage/src/main.rs:7:9 [INFO] [stdout] | [INFO] [stdout] 7 | let list = List::Cons(1, Box::new(List::Nil)); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_list` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `0` and `1` are never read [INFO] [stdout] --> box-usage/src/main.rs:3:10 [INFO] [stdout] | [INFO] [stdout] 3 | Cons(i32, Box), [INFO] [stdout] | ---- ^^^ ^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` 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] 3 | Cons((), ()), [INFO] [stdout] | ~~ ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking modules v0.1.0 (/opt/rustwide/workdir/modules) [INFO] [stderr] Checking cmd v0.1.0 (/opt/rustwide/workdir/cmd) [INFO] [stdout] warning: unused variable: `post` [INFO] [stdout] --> state-pattern/src/lib.rs:38:27 [INFO] [stdout] | [INFO] [stdout] 38 | fn content<'a>(&self, post: &'a Post) -> &'a str { [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_post` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking ref-scope v0.1.0 (/opt/rustwide/workdir/ref-scope) [INFO] [stdout] warning: unused variable: `v2` [INFO] [stdout] --> closures/src/main.rs:6:9 [INFO] [stdout] | [INFO] [stdout] 6 | let v2 = vec; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_v2` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> closures/src/main.rs:4:9 [INFO] [stdout] | [INFO] [stdout] 4 | let mut vec = vec![1, 2, 3]; [INFO] [stdout] | ----^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `plus_magic` [INFO] [stdout] --> closures/src/main.rs:19:9 [INFO] [stdout] | [INFO] [stdout] 19 | let plus_magic = |x: i32| x + magic_num; [INFO] [stdout] | ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_plus_magic` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `more_magic` [INFO] [stdout] --> closures/src/main.rs:20:9 [INFO] [stdout] | [INFO] [stdout] 20 | let more_magic = &mut magic_num; // Err! [INFO] [stdout] | ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_more_magic` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Label` is never constructed [INFO] [stdout] --> closures/src/main.rs:12:8 [INFO] [stdout] | [INFO] [stdout] 12 | struct Label { [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `default_ref` is never used [INFO] [stdout] --> closures/src/main.rs:16:4 [INFO] [stdout] | [INFO] [stdout] 16 | fn default_ref() { [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `default_move` is never used [INFO] [stdout] --> closures/src/main.rs:24:4 [INFO] [stdout] | [INFO] [stdout] 24 | fn default_move() { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: path statement drops value [INFO] [stdout] --> closures/src/main.rs:27:9 [INFO] [stdout] | [INFO] [stdout] 27 | numbers; [INFO] [stdout] | ^^^^^^^^ help: use `drop` to clarify the intent: `drop(numbers);` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(path_statements)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking num_cpus v1.10.1 [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking rand v0.4.6 [INFO] [stderr] Checking time v0.1.42 [INFO] [stdout] warning: unused variable: `rhs` [INFO] [stdout] --> ch19/src/main.rs:18:18 [INFO] [stdout] | [INFO] [stdout] 18 | fn add(self, rhs: Self) -> Self::Output { [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_rhs` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking rand v0.5.6 [INFO] [stdout] warning: trait `Add` is never used [INFO] [stdout] --> ch19/src/main.rs:6:7 [INFO] [stdout] | [INFO] [stdout] 6 | trait Add { [INFO] [stdout] | ^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `A` is never constructed [INFO] [stdout] --> ch19/src/main.rs:12:8 [INFO] [stdout] | [INFO] [stdout] 12 | struct A { [INFO] [stdout] | ^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `return_fn` is never used [INFO] [stdout] --> ch19/src/main.rs:23:4 [INFO] [stdout] | [INFO] [stdout] 23 | fn return_fn() -> Box i32>{ [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking add_two v0.1.0 (/opt/rustwide/workdir/add_two) [INFO] [stdout] warning: unused variable: `v2` [INFO] [stdout] --> closures/src/main.rs:6:9 [INFO] [stdout] | [INFO] [stdout] 6 | let v2 = vec; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_v2` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> closures/src/main.rs:4:9 [INFO] [stdout] | [INFO] [stdout] 4 | let mut vec = vec![1, 2, 3]; [INFO] [stdout] | ----^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `plus_magic` [INFO] [stdout] --> closures/src/main.rs:19:9 [INFO] [stdout] | [INFO] [stdout] 19 | let plus_magic = |x: i32| x + magic_num; [INFO] [stdout] | ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_plus_magic` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `more_magic` [INFO] [stdout] --> closures/src/main.rs:20:9 [INFO] [stdout] | [INFO] [stdout] 20 | let more_magic = &mut magic_num; // Err! [INFO] [stdout] | ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_more_magic` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Label` is never constructed [INFO] [stdout] --> closures/src/main.rs:12:8 [INFO] [stdout] | [INFO] [stdout] 12 | struct Label { [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `default_ref` is never used [INFO] [stdout] --> closures/src/main.rs:16:4 [INFO] [stdout] | [INFO] [stdout] 16 | fn default_ref() { [INFO] [stdout] | ^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function `default_move` is never used [INFO] [stdout] --> closures/src/main.rs:24:4 [INFO] [stdout] | [INFO] [stdout] 24 | fn default_move() { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: path statement drops value [INFO] [stdout] --> closures/src/main.rs:27:9 [INFO] [stdout] | [INFO] [stdout] 27 | numbers; [INFO] [stdout] | ^^^^^^^^ help: use `drop` to clarify the intent: `drop(numbers);` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(path_statements)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 8 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking crossbeam-epoch v0.7.2 [INFO] [stdout] warning: unused variable: `list` [INFO] [stdout] --> box-usage/src/main.rs:7:9 [INFO] [stdout] | [INFO] [stdout] 7 | let list = List::Cons(1, Box::new(List::Nil)); [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_list` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `0` and `1` are never read [INFO] [stdout] --> box-usage/src/main.rs:3:10 [INFO] [stdout] | [INFO] [stdout] 3 | Cons(i32, Box), [INFO] [stdout] | ---- ^^^ ^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | fields in this variant [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` 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] 3 | Cons((), ()), [INFO] [stdout] | ~~ ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Checking hyper v0.10.16 [INFO] [stderr] Checking crossbeam-deque v0.7.1 [INFO] [stderr] Checking rand v0.3.23 [INFO] [stderr] Checking num-traits v0.1.43 [INFO] [stdout] error: aborting due to 1 previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0310`. [INFO] [stdout] [INFO] [stderr] error: could not compile `rustc-serialize` (lib) due to 2 previous errors [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] running `Command { std: "docker" "inspect" "924e7c7796b4aca9674367505020a386b1b63c5ceafbbed7b6c0ec3ff8dc5ef3", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "924e7c7796b4aca9674367505020a386b1b63c5ceafbbed7b6c0ec3ff8dc5ef3", kill_on_drop: false }` [INFO] [stdout] 924e7c7796b4aca9674367505020a386b1b63c5ceafbbed7b6c0ec3ff8dc5ef3