[INFO] updating cached repository Noah-Kennedy/data_structures [INFO] running `"git" "fetch" "--all"` [INFO] [stdout] Fetching origin [INFO] [stderr] From git://github.com/Noah-Kennedy/data_structures [INFO] [stderr] * branch HEAD -> FETCH_HEAD [INFO] running `"git" "clone" "work/cache/sources/gh/Noah-Kennedy/data_structures" "work/ex/beta-1.38-1/sources/1.37.0/gh/Noah-Kennedy/data_structures"` [INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Noah-Kennedy/data_structures'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/Noah-Kennedy/data_structures" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Noah-Kennedy/data_structures"` [INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Noah-Kennedy/data_structures'... [INFO] [stderr] done. [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] a649cc7d69a397d7ac7bd381f94acfd30cfe198e [INFO] sha for GitHub repo Noah-Kennedy/data_structures: a649cc7d69a397d7ac7bd381f94acfd30cfe198e [INFO] validating manifest of Noah-Kennedy/data_structures on toolchain 1.37.0 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of Noah-Kennedy/data_structures on toolchain beta-2019-08-13 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started frobbing Noah-Kennedy/data_structures [INFO] finished frobbing Noah-Kennedy/data_structures [INFO] frobbed toml for Noah-Kennedy/data_structures written to work/ex/beta-1.38-1/sources/1.37.0/gh/Noah-Kennedy/data_structures/Cargo.toml [INFO] started frobbing Noah-Kennedy/data_structures [INFO] finished frobbing Noah-Kennedy/data_structures [INFO] frobbed toml for Noah-Kennedy/data_structures written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Noah-Kennedy/data_structures/Cargo.toml [INFO] crate Noah-Kennedy/data_structures already has a lockfile, it will not be regenerated [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] testing Noah-Kennedy/data_structures against beta-2019-08-13 for beta-1.38-1 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Noah-Kennedy/data_structures:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"` [INFO] [stdout] feb7b52bf419edc82ffc0e65f7eb17a3f9576015d1376910e1ff9fa1fa0b4e03 [INFO] running `"docker" "start" "-a" "feb7b52bf419edc82ffc0e65f7eb17a3f9576015d1376910e1ff9fa1fa0b4e03"` [INFO] [stderr] Compiling data_structures v0.1.0 (/opt/crater/workdir) [INFO] [stderr] warning: unreachable expression [INFO] [stderr] --> src/lists/linked_list.rs:35:9 [INFO] [stderr] | [INFO] [stderr] 35 | true [INFO] [stderr] | ^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unreachable_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `result` [INFO] [stderr] --> src/lists/linked_list.rs:15:13 [INFO] [stderr] | [INFO] [stderr] 15 | let result = true; [INFO] [stderr] | ^^^^^^ help: consider prefixing with an underscore: `_result` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `index` [INFO] [stderr] --> src/lists/linked_list.rs:13:38 [INFO] [stderr] | [INFO] [stderr] 13 | fn insert(&mut self, element: E, index: u64) -> bool { [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_index` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `index` [INFO] [stderr] --> src/lists/linked_list.rs:38:19 [INFO] [stderr] | [INFO] [stderr] 38 | fn get(&self, index: u64) -> Option { [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_index` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `index` [INFO] [stderr] --> src/lists/linked_list.rs:42:23 [INFO] [stderr] | [INFO] [stderr] 42 | fn set(&mut self, index: u64, new_value: E) -> bool { [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_index` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `new_value` [INFO] [stderr] --> src/lists/linked_list.rs:42:35 [INFO] [stderr] | [INFO] [stderr] 42 | fn set(&mut self, index: u64, new_value: E) -> bool { [INFO] [stderr] | ^^^^^^^^^ help: consider prefixing with an underscore: `_new_value` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `index` [INFO] [stderr] --> src/lists/linked_list.rs:46:26 [INFO] [stderr] | [INFO] [stderr] 46 | fn remove(&mut self, index: u64) -> bool { [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_index` [INFO] [stderr] [INFO] [stderr] error[E0507]: cannot move out of `self.head` which is behind a mutable reference [INFO] [stderr] --> src/lists/linked_list.rs:17:28 [INFO] [stderr] | [INFO] [stderr] 17 | let mut iterator = self.head; [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | move occurs because `self.head` has type `&mut std::option::Option>`, which does not implement the `Copy` trait [INFO] [stderr] | help: consider borrowing here: `&self.head` [INFO] [stderr] [INFO] [stderr] error[E0716]: temporary value dropped while borrowed [INFO] [stderr] --> src/lists/linked_list.rs:23:37 [INFO] [stderr] | [INFO] [stderr] 11 | impl<'a, E> super::List<'a, E> for LinkedList<'a, E> { [INFO] [stderr] | -- lifetime `'a` defined here [INFO] [stderr] ... [INFO] [stderr] 22 | let new_node = ListNode { [INFO] [stderr] | ____________________________________- [INFO] [stderr] 23 | | next: & mut None, [INFO] [stderr] | | ^^^^ creates a temporary which is freed while still in use [INFO] [stderr] 24 | | value: element [INFO] [stderr] 25 | | }; [INFO] [stderr] | |_____________________- assignment requires that borrow lasts for `'a` [INFO] [stderr] 26 | self.head = &mut Some(new_node); [INFO] [stderr] 27 | }, [INFO] [stderr] | - temporary value is freed at the end of this statement [INFO] [stderr] [INFO] [stderr] error[E0382]: use of moved value: `element` [INFO] [stderr] --> src/lists/linked_list.rs:24:32 [INFO] [stderr] | [INFO] [stderr] 11 | impl<'a, E> super::List<'a, E> for LinkedList<'a, E> { [INFO] [stderr] | - consider adding a `Copy` constraint to this type argument [INFO] [stderr] 12 | [INFO] [stderr] 13 | fn insert(&mut self, element: E, index: u64) -> bool { [INFO] [stderr] | ------- move occurs because `element` has type `E`, which does not implement the `Copy` trait [INFO] [stderr] ... [INFO] [stderr] 24 | value: element [INFO] [stderr] | ^^^^^^^ value moved here, in previous iteration of loop [INFO] [stderr] [INFO] [stderr] error[E0716]: temporary value dropped while borrowed [INFO] [stderr] --> src/lists/linked_list.rs:26:38 [INFO] [stderr] | [INFO] [stderr] 11 | impl<'a, E> super::List<'a, E> for LinkedList<'a, E> { [INFO] [stderr] | -- lifetime `'a` defined here [INFO] [stderr] ... [INFO] [stderr] 26 | self.head = &mut Some(new_node); [INFO] [stderr] | -----------------^^^^^^^^^^^^^^- temporary value is freed at the end of this statement [INFO] [stderr] | | | [INFO] [stderr] | | creates a temporary which is freed while still in use [INFO] [stderr] | assignment requires that borrow lasts for `'a` [INFO] [stderr] [INFO] [stderr] error: aborting due to 4 previous errors [INFO] [stderr] [INFO] [stderr] Some errors have detailed explanations: E0382, E0507, E0716. [INFO] [stderr] For more information about an error, try `rustc --explain E0382`. [INFO] [stderr] error: Could not compile `data_structures`. [INFO] [stderr] [INFO] [stderr] To learn more, run the command again with --verbose. [INFO] running `"docker" "inspect" "feb7b52bf419edc82ffc0e65f7eb17a3f9576015d1376910e1ff9fa1fa0b4e03"` [INFO] running `"docker" "rm" "-f" "feb7b52bf419edc82ffc0e65f7eb17a3f9576015d1376910e1ff9fa1fa0b4e03"` [INFO] [stdout] feb7b52bf419edc82ffc0e65f7eb17a3f9576015d1376910e1ff9fa1fa0b4e03