[INFO] cloning repository https://github.com/huangqian/rust-in-action [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/huangqian/rust-in-action" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhuangqian%2Frust-in-action", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhuangqian%2Frust-in-action'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] f36881cede964f6008c95f60cb1004db4fba9cc2 [INFO] testing huangqian/rust-in-action against 1.60.0 for beta-1.61-1 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhuangqian%2Frust-in-action" "/workspace/builds/worker-10/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/huangqian/rust-in-action on toolchain 1.60.0 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/huangqian/rust-in-action [INFO] removed 0 missing examples [INFO] finished tweaking git repo https://github.com/huangqian/rust-in-action [INFO] tweaked toml for git repo https://github.com/huangqian/rust-in-action written to /workspace/builds/worker-10/source/Cargo.toml [INFO] crate git repo https://github.com/huangqian/rust-in-action already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded combine v3.5.2 [INFO] [stderr] Downloaded named_pipe v0.3.0 [INFO] [stderr] Downloaded mysql_common v0.15.0 [INFO] [stderr] Downloaded twox-hash v1.1.1 [INFO] [stderr] Downloaded mysql v15.1.0 [INFO] [stderr] Downloaded atoi v0.3.1 [INFO] [stderr] Downloaded croaring v0.4.1 [INFO] [stderr] Downloaded num-bigint v0.2.1 [INFO] [stderr] Downloaded croaring-sys v0.4.1 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 07617c31ee7f66f38de8929783798e2f4260ea57938bf0f6bfa38af1f9264eef [INFO] running `Command { std: "docker" "start" "-a" "07617c31ee7f66f38de8929783798e2f4260ea57938bf0f6bfa38af1f9264eef", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "07617c31ee7f66f38de8929783798e2f4260ea57938bf0f6bfa38af1f9264eef", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "07617c31ee7f66f38de8929783798e2f4260ea57938bf0f6bfa38af1f9264eef", kill_on_drop: false }` [INFO] [stdout] 07617c31ee7f66f38de8929783798e2f4260ea57938bf0f6bfa38af1f9264eef [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 16d6e799a744a27e02111a5c0af07cc49819a1b47a95ca0ad5b468c67fae5f61 [INFO] running `Command { std: "docker" "start" "-a" "16d6e799a744a27e02111a5c0af07cc49819a1b47a95ca0ad5b468c67fae5f61", 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] [stderr] Compiling libc v0.2.50 [INFO] [stderr] Compiling cfg-if v0.1.5 [INFO] [stderr] Compiling cc v1.0.48 [INFO] [stderr] Compiling version_check v0.1.5 [INFO] [stderr] Compiling byteorder v1.2.6 [INFO] [stderr] Compiling lazy_static v1.2.0 [INFO] [stderr] Compiling void v1.0.2 [INFO] [stderr] Compiling rand_core v0.4.0 [INFO] [stderr] Compiling autocfg v0.1.2 [INFO] [stderr] Compiling ucd-util v0.1.2 [INFO] [stderr] Compiling regex v1.0.6 [INFO] [stderr] Compiling bitflags v1.0.4 [INFO] [stderr] Compiling utf8-ranges v1.0.2 [INFO] [stderr] Compiling glob v0.3.0 [INFO] [stderr] Compiling rand_core v0.2.1 [INFO] [stderr] Compiling num-traits v0.2.6 [INFO] [stderr] Compiling typenum v1.10.0 [INFO] [stderr] Compiling rustc-demangle v0.1.16 [INFO] [stderr] Compiling proc-macro2 v0.4.30 [INFO] [stderr] Compiling quick-error v1.2.2 [INFO] [stderr] Compiling unicode-width v0.1.7 [INFO] [stderr] Compiling stable_deref_trait v1.1.1 [INFO] [stderr] Compiling num-integer v0.1.39 [INFO] [stderr] Compiling futures v0.1.25 [INFO] [stderr] Compiling ansi_term v0.11.0 [INFO] [stderr] Compiling termcolor v1.0.5 [INFO] [stderr] Compiling vec_map v0.8.1 [INFO] [stderr] Compiling bindgen v0.49.4 [INFO] [stderr] Compiling shlex v0.1.1 [INFO] [stderr] Compiling serde v1.0.80 [INFO] [stderr] Compiling peeking_take_while v0.1.2 [INFO] [stderr] Compiling scopeguard v0.3.3 [INFO] [stderr] Compiling byte-tools v0.3.1 [INFO] [stderr] Compiling ryu v0.2.6 [INFO] [stderr] Compiling slab v0.4.1 [INFO] [stderr] Compiling lazycell v1.2.0 [INFO] [stderr] Compiling num-bigint v0.2.1 [INFO] [stderr] Compiling unicode-normalization v0.1.7 [INFO] [stderr] Compiling opaque-debug v0.2.2 [INFO] [stderr] Compiling nix v0.12.0 [INFO] 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Compiling env_logger v0.6.2 [INFO] [stderr] Compiling tokio-tcp v0.1.2 [INFO] [stderr] Compiling serde_json v1.0.32 [INFO] [stderr] Compiling mysql_common v0.15.0 [INFO] [stderr] Compiling croaring-sys v0.4.1 [INFO] [stderr] Compiling croaring v0.4.1 [INFO] [stderr] Compiling rust-in-action v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `user1` [INFO] [stdout] --> src/main.rs:63:9 [INFO] [stdout] | [INFO] [stdout] 63 | let user1 = User{ [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct is never constructed: `User` [INFO] [stdout] --> src/main.rs:55:8 [INFO] [stdout] | [INFO] [stdout] 55 | struct User{ [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `struct_example` [INFO] [stdout] --> src/main.rs:62:4 [INFO] [stdout] | [INFO] [stdout] 62 | fn struct_example(){ [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 44.85s [INFO] running `Command { std: "docker" "inspect" "16d6e799a744a27e02111a5c0af07cc49819a1b47a95ca0ad5b468c67fae5f61", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "16d6e799a744a27e02111a5c0af07cc49819a1b47a95ca0ad5b468c67fae5f61", kill_on_drop: false }` [INFO] [stdout] 16d6e799a744a27e02111a5c0af07cc49819a1b47a95ca0ad5b468c67fae5f61 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 28a0f73e27ea5468340efb8d4e2cbbe56f88d7831c471800f5e06aa564c909c3 [INFO] running `Command { std: "docker" "start" "-a" "28a0f73e27ea5468340efb8d4e2cbbe56f88d7831c471800f5e06aa564c909c3", kill_on_drop: false }` [INFO] [stderr] Compiling rust-in-action v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] error[E0601]: `main` function not found in crate `borrow` [INFO] [stdout] --> examples/borrow.rs:15:1 [INFO] [stdout] | [INFO] [stdout] 15 | / #[cfg(test)] [INFO] [stdout] 16 | | mod borrow_reference_pointer_test { [INFO] [stdout] 17 | | [INFO] [stdout] 18 | | [INFO] [stdout] ... | [INFO] [stdout] 41 | | [INFO] [stdout] 42 | | } [INFO] [stdout] | |_^ consider adding a `main` function to `examples/borrow.rs` [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: could not compile `rust-in-action` due to 2 previous errors [INFO] [stdout] error: aborting due to previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] For more information about this error, try `rustc --explain E0601`. [INFO] [stdout] [INFO] [stdout] warning: unused variable: `arr` [INFO] [stdout] --> examples/compile-time-function-execution.rs:6:9 [INFO] [stdout] | [INFO] [stdout] 6 | let arr = [0, init_len()]; [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_arr` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: enum is never used: `IpAddrKind` [INFO] [stdout] --> examples/enums.rs:7:6 [INFO] [stdout] | [INFO] [stdout] 7 | enum IpAddrKind{ [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `user1` [INFO] [stdout] --> src/main.rs:63:9 [INFO] [stdout] | [INFO] [stdout] 63 | let user1 = User{ [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_user1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `one` [INFO] [stdout] --> examples/match.rs:18:9 [INFO] [stdout] | [INFO] [stdout] 18 | let one = increment(None); [INFO] [stdout] | ^^^ help: if this is intentional, prefix it with an underscore: `_one` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct is never constructed: `User` [INFO] [stdout] --> src/main.rs:55:8 [INFO] [stdout] | [INFO] [stdout] 55 | struct User{ [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `struct_example` [INFO] [stdout] --> src/main.rs:62:4 [INFO] [stdout] | [INFO] [stdout] 62 | fn struct_example(){ [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant is never constructed: `Alabama` [INFO] [stdout] --> examples/match.rs:23:5 [INFO] [stdout] | [INFO] [stdout] 23 | Alabama, [INFO] [stdout] | ^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] note: `UsState` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] --> examples/match.rs:21:10 [INFO] [stdout] | [INFO] [stdout] 21 | #[derive(Debug)] [INFO] [stdout] | ^^^^^ [INFO] [stdout] = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant is never constructed: `Nickel` [INFO] [stdout] --> examples/match.rs:29:5 [INFO] [stdout] | [INFO] [stdout] 29 | Nickel, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variant is never constructed: `Dime` [INFO] [stdout] --> examples/match.rs:30:5 [INFO] [stdout] | [INFO] [stdout] 30 | Dime, [INFO] [stdout] | ^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel [INFO] [stdout] --> examples/redis.rs:1:1 [INFO] [stdout] | [INFO] [stdout] 1 | #![feature(proc_macro_hygiene, decl_macro)] [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `redis::Commands` [INFO] [stdout] --> examples/redis.rs:6:5 [INFO] [stdout] | [INFO] [stdout] 6 | use redis::Commands; [INFO] [stdout] | ^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0601]: `main` function not found in crate `redis` [INFO] [stdout] --> examples/redis.rs:1:1 [INFO] [stdout] | [INFO] [stdout] 1 | / #![feature(proc_macro_hygiene, decl_macro)] [INFO] [stdout] 2 | | [INFO] [stdout] 3 | | [INFO] [stdout] 4 | | extern crate redis; [INFO] [stdout] ... | [INFO] [stdout] 41 | | [INFO] [stdout] 42 | | } [INFO] [stdout] | |_^ consider adding a `main` function to `examples/redis.rs` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 2 previous errors; 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] Some errors have detailed explanations: E0554, E0601. [INFO] [stdout] [INFO] [stdout] For more information about an error, try `rustc --explain E0554`. [INFO] [stdout] [INFO] [stdout] warning: unused variable: `f2` [INFO] [stdout] --> examples/copy.rs:23:9 [INFO] [stdout] | [INFO] [stdout] 23 | let f2 = f1; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_f2` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `#[macro_use]` import [INFO] [stdout] --> examples/mysql.rs:2:1 [INFO] [stdout] | [INFO] [stdout] 2 | #[macro_use] [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused imports: `OptsBuilder`, `Opts`, `Pool`, `Value`, `from_value` [INFO] [stdout] --> examples/mysql.rs:5:13 [INFO] [stdout] | [INFO] [stdout] 5 | use mysql::{from_value, Opts, OptsBuilder, Pool, Value}; [INFO] [stdout] | ^^^^^^^^^^ ^^^^ ^^^^^^^^^^^ ^^^^ ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0423]: expected value, found struct `LinkedList` [INFO] [stdout] --> examples/collection/list.rs:5:5 [INFO] [stdout] | [INFO] [stdout] 5 | LinkedList [INFO] [stdout] | ^^^^^^^^^^ help: use struct literal syntax instead: `LinkedList { head: val, tail: val, len: val, marker: val }` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0601]: `main` function not found in crate `mysql` [INFO] [stdout] --> examples/mysql.rs:1:1 [INFO] [stdout] | [INFO] [stdout] 1 | / extern crate core; [INFO] [stdout] 2 | | #[macro_use] [INFO] [stdout] 3 | | extern crate mysql; [INFO] [stdout] 4 | | [INFO] [stdout] ... | [INFO] [stdout] 87 | | } [INFO] [stdout] 88 | | } [INFO] [stdout] | |_^ consider adding a `main` function to `examples/mysql.rs` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error; 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0601`. [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0423`. [INFO] [stdout] [INFO] [stdout] error[E0425]: cannot find function, tuple struct or tuple variant `Structure` in this scope [INFO] [stdout] --> examples/structs.rs:4:22 [INFO] [stdout] | [INFO] [stdout] 4 | println!("{:?}", Structure(3)); [INFO] [stdout] | ^^^^^^^^^ not found in this scope [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `while_case` [INFO] [stdout] --> examples/loop.rs:11:4 [INFO] [stdout] | [INFO] [stdout] 11 | fn while_case(){ [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: function is never used: `while_demo_2` [INFO] [stdout] --> examples/loop.rs:20:4 [INFO] [stdout] | [INFO] [stdout] 20 | fn while_demo_2(){ [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0425`. [INFO] [stdout] [INFO] [stdout] warning: unused variable: `a` [INFO] [stdout] --> examples/function-pointer.rs:23:9 [INFO] [stdout] | [INFO] [stdout] 23 | let a = 2; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `b` [INFO] [stdout] --> examples/function-pointer.rs:24:9 [INFO] [stdout] | [INFO] [stdout] 24 | let b = 3; [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_b` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s2` [INFO] [stdout] --> examples/ownership.rs:8:9 [INFO] [stdout] | [INFO] [stdout] 8 | let s2 = s1; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0601]: `main` function not found in crate `box` [INFO] [stdout] --> examples/box.rs:1:1 [INFO] [stdout] | [INFO] [stdout] 1 | / #[cfg(test)] [INFO] [stdout] 2 | | mod box_test { [INFO] [stdout] 3 | | use box_test::List::{Cons, Nil}; [INFO] [stdout] 4 | | use MyBox; [INFO] [stdout] ... | [INFO] [stdout] 60 | | } [INFO] [stdout] 61 | | } [INFO] [stdout] | |_^ consider adding a `main` function to `examples/box.rs` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0601`. [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 4 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 2 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: build failed [INFO] running `Command { std: "docker" "inspect" "28a0f73e27ea5468340efb8d4e2cbbe56f88d7831c471800f5e06aa564c909c3", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "28a0f73e27ea5468340efb8d4e2cbbe56f88d7831c471800f5e06aa564c909c3", kill_on_drop: false }` [INFO] [stdout] 28a0f73e27ea5468340efb8d4e2cbbe56f88d7831c471800f5e06aa564c909c3