[INFO] updating cached repository jonstites/algorithms [INFO] running `"git" "fetch" "--all"` [INFO] [stdout] Fetching origin [INFO] [stderr] From git://github.com/jonstites/algorithms [INFO] [stderr] * branch HEAD -> FETCH_HEAD [INFO] running `"git" "clone" "work/cache/sources/gh/jonstites/algorithms" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/jonstites/algorithms"` [INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/jonstites/algorithms'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/jonstites/algorithms" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/jonstites/algorithms"` [INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/jonstites/algorithms'... [INFO] [stderr] done. [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] 93733779da930327b564e86c722ded9675d917f3 [INFO] sha for GitHub repo jonstites/algorithms: 93733779da930327b564e86c722ded9675d917f3 [INFO] validating manifest of jonstites/algorithms on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of jonstites/algorithms on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started frobbing jonstites/algorithms [INFO] finished frobbing jonstites/algorithms [INFO] frobbed toml for jonstites/algorithms written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/jonstites/algorithms/Cargo.toml [INFO] started frobbing jonstites/algorithms [INFO] finished frobbing jonstites/algorithms [INFO] frobbed toml for jonstites/algorithms written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/jonstites/algorithms/Cargo.toml [INFO] crate jonstites/algorithms already has a lockfile, it will not be regenerated [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] checking jonstites/algorithms against try#266783e4e09e4e9d5307c1c8e695659c58bbcac7 for pr-63376 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-7/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/jonstites/algorithms:/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=forbid" "-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" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "check" "--frozen" "--all" "--all-targets"` [INFO] [stdout] 91537d36278f30e4770ddb2ffd5968e0a3aae073dcf9376bd9628bf7151f9ca7 [INFO] running `"docker" "start" "-a" "91537d36278f30e4770ddb2ffd5968e0a3aae073dcf9376bd9628bf7151f9ca7"` [INFO] [stderr] Checking algorithms v0.1.0 (/opt/crater/workdir) [INFO] [stderr] warning: unused variable: `head` [INFO] [stderr] --> src/lib.rs:269:17 [INFO] [stderr] | [INFO] [stderr] 269 | let head = match self.to_head() { [INFO] [stderr] | ^^^^ help: consider prefixing with an underscore: `_head` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: method is never used: `new` [INFO] [stderr] --> src/lib.rs:15:9 [INFO] [stderr] | [INFO] [stderr] 15 | pub fn new() -> LinkedList { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(dead_code)]` on by default [INFO] [stderr] [INFO] [stderr] warning: method is never used: `push` [INFO] [stderr] --> src/lib.rs:19:9 [INFO] [stderr] | [INFO] [stderr] 19 | pub fn push(&mut self, value: T) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `peek` [INFO] [stderr] --> src/lib.rs:35:9 [INFO] [stderr] | [INFO] [stderr] 35 | pub fn peek(&self) -> Option<&T> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `peek_mut` [INFO] [stderr] --> src/lib.rs:39:9 [INFO] [stderr] | [INFO] [stderr] 39 | pub fn peek_mut(&mut self) -> Option<&mut T> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `iter` [INFO] [stderr] --> src/lib.rs:43:9 [INFO] [stderr] | [INFO] [stderr] 43 | pub fn iter(&self) -> Iter { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `iter_mut` [INFO] [stderr] --> src/lib.rs:50:9 [INFO] [stderr] | [INFO] [stderr] 50 | pub fn iter_mut(&mut self) -> IterMut { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Iter` [INFO] [stderr] --> src/lib.rs:57:5 [INFO] [stderr] | [INFO] [stderr] 57 | pub struct Iter<'a, T> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `IterMut` [INFO] [stderr] --> src/lib.rs:71:5 [INFO] [stderr] | [INFO] [stderr] 71 | pub struct IterMut<'a, T> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: type alias is never used: `NodeIndex` [INFO] [stderr] --> src/lib.rs:194:5 [INFO] [stderr] | [INFO] [stderr] 194 | type NodeIndex = usize; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `Graph` [INFO] [stderr] --> src/lib.rs:197:5 [INFO] [stderr] | [INFO] [stderr] 197 | / pub struct Graph [INFO] [stderr] 198 | | where [INFO] [stderr] 199 | | T: std::fmt::Debug, [INFO] [stderr] 200 | | { [INFO] [stderr] ... | [INFO] [stderr] 203 | | reversed_edges: Vec>, [INFO] [stderr] 204 | | } [INFO] [stderr] | |_____^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `NodeData` [INFO] [stderr] --> src/lib.rs:207:5 [INFO] [stderr] | [INFO] [stderr] 207 | struct NodeData { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: struct is never constructed: `EdgeData` [INFO] [stderr] --> src/lib.rs:212:5 [INFO] [stderr] | [INFO] [stderr] 212 | struct EdgeData { [INFO] [stderr] | ^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `new` [INFO] [stderr] --> src/lib.rs:220:9 [INFO] [stderr] | [INFO] [stderr] 220 | pub fn new() -> Graph { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `add_node` [INFO] [stderr] --> src/lib.rs:228:9 [INFO] [stderr] | [INFO] [stderr] 228 | pub fn add_node(&mut self, data: T) -> NodeIndex { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `add_edge` [INFO] [stderr] --> src/lib.rs:236:9 [INFO] [stderr] | [INFO] [stderr] 236 | pub fn add_edge(&mut self, source: NodeIndex, target: NodeIndex) -> Result<(), ()> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `is_tree` [INFO] [stderr] --> src/lib.rs:255:9 [INFO] [stderr] | [INFO] [stderr] 255 | pub fn is_tree(&self) -> bool { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `num_edges` [INFO] [stderr] --> src/lib.rs:264:9 [INFO] [stderr] | [INFO] [stderr] 264 | fn num_edges(&self) -> usize { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `is_connected` [INFO] [stderr] --> src/lib.rs:268:9 [INFO] [stderr] | [INFO] [stderr] 268 | fn is_connected(&self) -> bool { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: method is never used: `to_head` [INFO] [stderr] --> src/lib.rs:301:9 [INFO] [stderr] | [INFO] [stderr] 301 | fn to_head(&self) -> Option { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused variable: `head` [INFO] [stderr] --> src/lib.rs:269:17 [INFO] [stderr] | [INFO] [stderr] 269 | let head = match self.to_head() { [INFO] [stderr] | ^^^^ help: consider prefixing with an underscore: `_head` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/lib.rs:344:13 [INFO] [stderr] | [INFO] [stderr] 344 | graph.add_edge(a, b); [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/lib.rs:349:13 [INFO] [stderr] | [INFO] [stderr] 349 | graph.add_edge(c, d); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [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/lib.rs:350:13 [INFO] [stderr] | [INFO] [stderr] 350 | graph.add_edge(d, c); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 1.40s [INFO] running `"docker" "inspect" "91537d36278f30e4770ddb2ffd5968e0a3aae073dcf9376bd9628bf7151f9ca7"` [INFO] running `"docker" "rm" "-f" "91537d36278f30e4770ddb2ffd5968e0a3aae073dcf9376bd9628bf7151f9ca7"` [INFO] [stdout] 91537d36278f30e4770ddb2ffd5968e0a3aae073dcf9376bd9628bf7151f9ca7