[INFO] updating cached repository https://github.com/Delorus/rust_learning [INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"` [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] 85e9ac89dac5dca12156acf98619a6a7add91951 [INFO] checking Delorus/rust_learning against try#1a399c10897767c36d147199696c96f193034e49 for pr-72644 [INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDelorus%2Frust_learning" "/workspace/builds/worker-10/source"` [INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/Delorus/rust_learning on toolchain 1a399c10897767c36d147199696c96f193034e49 [INFO] running `"/workspace/cargo-home/bin/cargo" "+1a399c10897767c36d147199696c96f193034e49" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started tweaking git repo https://github.com/Delorus/rust_learning [INFO] finished tweaking git repo https://github.com/Delorus/rust_learning [INFO] tweaked toml for git repo https://github.com/Delorus/rust_learning written to /workspace/builds/worker-10/source/Cargo.toml [INFO] crate git repo https://github.com/Delorus/rust_learning already has a lockfile, it will not be regenerated [INFO] running `"/workspace/cargo-home/bin/cargo" "+1a399c10897767c36d147199696c96f193034e49" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1a399c10897767c36d147199696c96f193034e49" "check" "--frozen" "--all" "--all-targets"` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] e15e5294e766f444386266589bf45c4426fee6d34bd8ab9f3a6d4eae1453f653 [INFO] running `"docker" "start" "-a" "e15e5294e766f444386266589bf45c4426fee6d34bd8ab9f3a6d4eae1453f653"` [INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted [INFO] [stderr] Checking learning v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] warning: unused import: `std::rc::Rc` [INFO] [stderr] --> src/bin/multithreads.rs:4:5 [INFO] [stderr] | [INFO] [stderr] 4 | use std::rc::Rc; [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] error[E0412]: cannot find type `T` in this scope [INFO] [stderr] --> src/bin/adv_types.rs:18:30 [INFO] [stderr] | [INFO] [stderr] 18 | type Result = result::Result; [INFO] [stderr] | - ^ not found in this scope [INFO] [stderr] | | [INFO] [stderr] | help: you might be missing a type parameter: `` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `total` [INFO] [stderr] --> src/bin/iterators.rs:10:9 [INFO] [stderr] | [INFO] [stderr] 10 | let total: i32 = v_iter.sum(); [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_total` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `iter_terminated` [INFO] [stderr] --> src/bin/iterators.rs:5:4 [INFO] [stderr] | [INFO] [stderr] 5 | fn iter_terminated() { [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `iter_adaptors` [INFO] [stderr] --> src/bin/iterators.rs:13:4 [INFO] [stderr] | [INFO] [stderr] 13 | fn iter_adaptors() { [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] error[E0308]: mismatched types [INFO] [stderr] --> src/bin/adv_types.rs:20:22 [INFO] [stderr] | [INFO] [stderr] 20 | fn never_return() -> ! { [INFO] [stderr] | ------------ ^ expected `!`, found `()` [INFO] [stderr] | | [INFO] [stderr] | implicitly returns `()` as its body has no tail or `return` expression [INFO] [stderr] | [INFO] [stderr] = note: expected type `!` [INFO] [stderr] found unit type `()` [INFO] [stderr] [INFO] [stderr] error: aborting due to 2 previous errors [INFO] [stderr] [INFO] [stderr] Some errors have detailed explanations: E0308, E0412. [INFO] [stderr] For more information about an error, try `rustc --explain E0308`. [INFO] [stderr] error: could not compile `learning`. [INFO] [stderr] [INFO] [stderr] To learn more, run the command again with --verbose. [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] warning: 3 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Guess` [INFO] [stderr] --> src/bin/tests.rs:60:8 [INFO] [stderr] | [INFO] [stderr] 60 | struct Guess { [INFO] [stderr] | ^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: associated function is never used: `new` [INFO] [stderr] --> src/bin/tests.rs:65:12 [INFO] [stderr] | [INFO] [stderr] 65 | pub fn new(value: u32) -> Guess { [INFO] [stderr] | ^^^ [INFO] [stderr] [INFO] [stderr] warning: associated function is never used: `square` [INFO] [stderr] --> src/bin/methods.rs:12:8 [INFO] [stderr] | [INFO] [stderr] 12 | fn square(size: u32) -> Rectangle { [INFO] [stderr] | ^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: associated function is never used: `can_hold` [INFO] [stderr] --> src/bin/methods.rs:34:8 [INFO] [stderr] | [INFO] [stderr] 34 | fn can_hold(&self, other: &Rectangle) -> bool { [INFO] [stderr] | ^^^^^^^^ [INFO] [stderr] [INFO] [stderr] error[E0412]: cannot find type `T` in this scope [INFO] [stderr] --> src/bin/adv_types.rs:18:30 [INFO] [stderr] | [INFO] [stderr] 18 | type Result = result::Result; [INFO] [stderr] | - ^ not found in this scope [INFO] [stderr] | | [INFO] [stderr] | help: you might be missing a type parameter: `` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `y` [INFO] [stderr] --> src/bin/borrow_checker_ref_and_copy.rs:76:9 [INFO] [stderr] | [INFO] [stderr] 76 | let y = &x; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/bin/borrow_checker_ref_and_copy.rs:77:9 [INFO] [stderr] | [INFO] [stderr] 77 | let mut z = &mut x; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `change_string` [INFO] [stderr] --> src/bin/borrow_checker_ref_and_copy.rs:5:4 [INFO] [stderr] | [INFO] [stderr] 5 | fn change_string() { [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `create_user` [INFO] [stderr] --> src/bin/structures.rs:13:4 [INFO] [stderr] | [INFO] [stderr] 13 | fn create_user() { [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `create_user_from_another` [INFO] [stderr] --> src/bin/structures.rs:28:4 [INFO] [stderr] | [INFO] [stderr] 28 | fn create_user_from_another() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Point` [INFO] [stderr] --> src/bin/structures.rs:44:8 [INFO] [stderr] | [INFO] [stderr] 44 | struct Point(i32, i32); [INFO] [stderr] | ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `named_tuple` [INFO] [stderr] --> src/bin/structures.rs:46:4 [INFO] [stderr] | [INFO] [stderr] 46 | fn named_tuple() { [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] error[E0308]: mismatched types [INFO] [stderr] --> src/bin/adv_types.rs:20:22 [INFO] [stderr] | [INFO] [stderr] 20 | fn never_return() -> ! { [INFO] [stderr] | ------------ ^ expected `!`, found `()` [INFO] [stderr] | | [INFO] [stderr] | implicitly returns `()` as its body has no tail or `return` expression [INFO] [stderr] | [INFO] [stderr] = note: expected type `!` [INFO] [stderr] found unit type `()` [INFO] [stderr] [INFO] [stderr] error: aborting due to 2 previous errors [INFO] [stderr] [INFO] [stderr] Some errors have detailed explanations: E0308, E0412. [INFO] [stderr] For more information about an error, try `rustc --explain E0308`. [INFO] [stderr] warning: function is never used: `move_string_borrowed` [INFO] [stderr] --> src/bin/borrow_checker_ref_and_copy.rs:13:4 [INFO] [stderr] | [INFO] [stderr] 13 | fn move_string_borrowed() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `move_ownership` [INFO] [stderr] --> src/bin/borrow_checker_ref_and_copy.rs:21:4 [INFO] [stderr] | [INFO] [stderr] 21 | fn move_ownership() { [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `takes_ownership` [INFO] [stderr] --> src/bin/borrow_checker_ref_and_copy.rs:29:4 [INFO] [stderr] | [INFO] [stderr] 29 | fn takes_ownership(s: String) { [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `return_ownership` [INFO] [stderr] --> src/bin/borrow_checker_ref_and_copy.rs:33:4 [INFO] [stderr] | [INFO] [stderr] 33 | fn return_ownership() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `return_ownership_via_ref` [INFO] [stderr] --> src/bin/borrow_checker_ref_and_copy.rs:51:4 [INFO] [stderr] | [INFO] [stderr] 51 | fn return_ownership_via_ref() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `ref_and_ownership` [INFO] [stderr] --> src/bin/borrow_checker_ref_and_copy.rs:62:4 [INFO] [stderr] | [INFO] [stderr] 62 | fn ref_and_ownership() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: 2 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: function is never used: `longest` [INFO] [stderr] --> src/bin/lifetime.rs:7:4 [INFO] [stderr] | [INFO] [stderr] 7 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str { [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `create_new_thread` [INFO] [stderr] --> src/bin/multithreads.rs:10:4 [INFO] [stderr] | [INFO] [stderr] 10 | fn create_new_thread() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `ImportantExcerpt` [INFO] [stderr] --> src/bin/lifetime.rs:26:8 [INFO] [stderr] | [INFO] [stderr] 26 | struct ImportantExcerpt<'a> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `lifetime_in_struct` [INFO] [stderr] --> src/bin/lifetime.rs:30:4 [INFO] [stderr] | [INFO] [stderr] 30 | fn lifetime_in_struct() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: 9 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: function is never used: `longest_with_an_announcement` [INFO] [stderr] --> src/bin/lifetime.rs:42:4 [INFO] [stderr] | [INFO] [stderr] 42 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: 2 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: function is never used: `wait_new_thread` [INFO] [stderr] --> src/bin/multithreads.rs:18:4 [INFO] [stderr] | [INFO] [stderr] 18 | fn wait_new_thread() { [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `move_closure_with_new_thread` [INFO] [stderr] --> src/bin/multithreads.rs:28:4 [INFO] [stderr] | [INFO] [stderr] 28 | fn move_closure_with_new_thread() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `create_channel` [INFO] [stderr] --> src/bin/multithreads.rs:38:4 [INFO] [stderr] | [INFO] [stderr] 38 | fn create_channel() { [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `sending_multiple_values_in_channels` [INFO] [stderr] --> src/bin/multithreads.rs:50:4 [INFO] [stderr] | [INFO] [stderr] 50 | fn sending_multiple_values_in_channels() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `mutex` [INFO] [stderr] --> src/bin/multithreads.rs:87:4 [INFO] [stderr] | [INFO] [stderr] 87 | fn mutex() { [INFO] [stderr] | ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: 4 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/bin/multithreads.rs:25:5 [INFO] [stderr] | [INFO] [stderr] 25 | handle.join(); [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_must_use)]` on by default [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/bin/multithreads.rs:35:5 [INFO] [stderr] | [INFO] [stderr] 35 | handle.join(); [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: 4 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: function is never used: `weak_ref_cycle` [INFO] [stderr] --> src/bin/smart_ptr_cycle.rs:51:4 [INFO] [stderr] | [INFO] [stderr] 51 | fn weak_ref_cycle() { [INFO] [stderr] | ^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `override_plus` [INFO] [stderr] --> src/bin/adv_traits.rs:24:4 [INFO] [stderr] | [INFO] [stderr] 24 | fn override_plus() { [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: associated function is never used: `fly` [INFO] [stderr] --> src/bin/adv_traits.rs:67:8 [INFO] [stderr] | [INFO] [stderr] 67 | fn fly(&self) { [INFO] [stderr] | ^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `several_realisation` [INFO] [stderr] --> src/bin/adv_traits.rs:72:4 [INFO] [stderr] | [INFO] [stderr] 72 | fn several_realisation() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Dog` [INFO] [stderr] --> src/bin/adv_traits.rs:83:8 [INFO] [stderr] | [INFO] [stderr] 83 | struct Dog; [INFO] [stderr] | ^^^ [INFO] [stderr] [INFO] [stderr] warning: associated function is never used: `baby_name` [INFO] [stderr] --> src/bin/adv_traits.rs:86:8 [INFO] [stderr] | [INFO] [stderr] 86 | fn baby_name() -> String { [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `several_static_realisation` [INFO] [stderr] --> src/bin/adv_traits.rs:97:4 [INFO] [stderr] | [INFO] [stderr] 97 | fn several_static_realisation() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `newtype` [INFO] [stderr] --> src/bin/adv_traits.rs:142:4 [INFO] [stderr] | [INFO] [stderr] 142 | fn newtype() { [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: 1 warning emitted [INFO] [stderr] [INFO] [stderr] warning: 9 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/bin/collections.rs:17:9 [INFO] [stderr] | [INFO] [stderr] 17 | let mut v = vec![1, 2, 3, 4, 5]; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: 7 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: function is never used: `create_vector` [INFO] [stderr] --> src/bin/collections.rs:7:4 [INFO] [stderr] | [INFO] [stderr] 7 | fn create_vector() { [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `get_value` [INFO] [stderr] --> src/bin/collections.rs:16:4 [INFO] [stderr] | [INFO] [stderr] 16 | fn get_value() { [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `create_hash_map` [INFO] [stderr] --> src/bin/collections.rs:24:4 [INFO] [stderr] | [INFO] [stderr] 24 | fn create_hash_map() { [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `get_stats` [INFO] [stderr] --> src/bin/collections.rs:31:4 [INFO] [stderr] | [INFO] [stderr] 31 | fn get_stats() { [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `stats` [INFO] [stderr] --> src/bin/collections.rs:38:4 [INFO] [stderr] | [INFO] [stderr] 38 | fn stats(v: &Vec) -> (f64, i32, i32) { [INFO] [stderr] | ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: 6 warnings emitted [INFO] [stderr] [INFO] [stderr] error: build failed [INFO] running `"docker" "inspect" "e15e5294e766f444386266589bf45c4426fee6d34bd8ab9f3a6d4eae1453f653"` [INFO] running `"docker" "rm" "-f" "e15e5294e766f444386266589bf45c4426fee6d34bd8ab9f3a6d4eae1453f653"` [INFO] [stdout] e15e5294e766f444386266589bf45c4426fee6d34bd8ab9f3a6d4eae1453f653