[INFO] cloning repository https://github.com/GiovanniKarra/MatrixCompletion
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/GiovanniKarra/MatrixCompletion" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGiovanniKarra%2FMatrixCompletion", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d3e195bf8b77175461d1387e5e58c7b4f5c1cf9d
[INFO] checking GiovanniKarra/MatrixCompletion against try#0611f7de057c584b8771102fde7aed6c70c71d3b for pr-146440
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGiovanniKarra%2FMatrixCompletion" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/GiovanniKarra/MatrixCompletion
[INFO] finished tweaking git repo https://github.com/GiovanniKarra/MatrixCompletion
[INFO] tweaked toml for git repo https://github.com/GiovanniKarra/MatrixCompletion written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/GiovanniKarra/MatrixCompletion on toolchain 0611f7de057c584b8771102fde7aed6c70c71d3b
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[INFO] crate git repo https://github.com/GiovanniKarra/MatrixCompletion 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" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fb47a0459df68b43fe44c700b2b3ae2060815128c2cd88d7da83aa4fa3e93034
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[INFO] [stderr]    Compiling autocfg v1.4.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.89
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]    Compiling libc v0.2.164
[INFO] [stderr]    Compiling crossbeam-utils v0.8.20
[INFO] [stderr]    Compiling zerocopy v0.8.26
[INFO] [stderr]    Compiling getrandom v0.3.3
[INFO] [stderr]    Compiling serde v1.0.215
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[INFO] [stdout] warning: unused variable: `max_iter`
[INFO] [stdout]   --> src/opti/solver.rs:28:7
[INFO] [stdout]    |
[INFO] [stdout] 28 |         let max_iter = 100;
[INFO] [stdout]    |             ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_max_iter`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `LinearConstraintMatrix` is never constructed
[INFO] [stdout]   --> src/opti/mod.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub struct LinearConstraintMatrix<T: Float> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]    = note: `#[deny(unused_unconstructable_pub_struct)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `ConicOptiProblem` is never constructed
[INFO] [stdout]    --> src/opti/mod.rs:118:12
[INFO] [stdout]     |
[INFO] [stdout] 118 | pub struct ConicOptiProblem<T, C, A>
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a` and `b` are never read
[INFO] [stdout]   --> src/opti/mod.rs:89:2
[INFO] [stdout]    |
[INFO] [stdout] 88 | struct Constraint<T: Float, A: ConstraintMatrix<T>> {
[INFO] [stdout]    |        ---------- fields in this struct
[INFO] [stdout] 89 |     a: A,
[INFO] [stdout]    |     ^
[INFO] [stdout] 90 |     b: Matrix<T>
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/opti/mod.rs:94:5
[INFO] [stdout]    |
[INFO] [stdout] 93 | impl<T: Float, A: ConstraintMatrix<T>> Constraint<T, A> {
[INFO] [stdout]    | ------------------------------------------------------- associated function in this implementation
[INFO] [stdout] 94 |     fn new(a: A, b: Matrix<T>) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `obj`, `grad`, and `hess` are never read
[INFO] [stdout]    --> src/opti/mod.rs:101:2
[INFO] [stdout]     |
[INFO] [stdout] 100 | struct Objective<T: Float, I> {
[INFO] [stdout]     |        --------- fields in this struct
[INFO] [stdout] 101 |     obj: fn(&I) -> T,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 102 |     grad: Option<fn(&I) -> Matrix<T>>,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 103 |     hess: Option<fn(&I) -> Matrix<T>>
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/opti/mod.rs:107:9
[INFO] [stdout]     |
[INFO] [stdout] 106 | impl<T: Float, I> Objective<T, I> {
[INFO] [stdout]     | --------------------------------- associated function in this implementation
[INFO] [stdout] 107 |     pub fn new(
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `obj`, `constraint`, `cone`, and `size` are never read
[INFO] [stdout]    --> src/opti/mod.rs:120:2
[INFO] [stdout]     |
[INFO] [stdout] 118 | pub struct ConicOptiProblem<T, C, A>
[INFO] [stdout]     |            ---------------- fields in this struct
[INFO] [stdout] 119 | where T: Float, C: Cone<T>, A: ConstraintMatrix<T, Input = C::Input> {
[INFO] [stdout] 120 |     obj: Objective<T, C::Input>,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 121 |     constraint: Option<Constraint<T, A>>,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 122 |     cone: C,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 123 |     size: usize
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ConicOptiProblemBuilder` is never constructed
[INFO] [stdout]    --> src/opti/mod.rs:126:8
[INFO] [stdout]     |
[INFO] [stdout] 126 | struct ConicOptiProblemBuilder<T, C, A>
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `cone` are never used
[INFO] [stdout]    --> src/opti/mod.rs:136:5
[INFO] [stdout]     |
[INFO] [stdout] 134 | / impl<T, A> ConicOptiProblemBuilder<T, DefaultCone, A>
[INFO] [stdout] 135 | | where T: Float, A: ConstraintMatrix<T> {
[INFO] [stdout]     | |______________________________________- associated items in this implementation
[INFO] [stdout] 136 |       fn new() -> Self {
[INFO] [stdout]     |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 145 |       fn cone<C: Cone<T>>(self, cone: C) -> ConicOptiProblemBuilder<T, C, A> {
[INFO] [stdout]     |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `objective`, `constraint_a`, and `constraint_b` are never used
[INFO] [stdout]    --> src/opti/mod.rs:157:5
[INFO] [stdout]     |
[INFO] [stdout] 155 | / impl<T, C, A> ConicOptiProblemBuilder<T, C, A>
[INFO] [stdout] 156 | | where T: Float, C: Cone<T>, A: ConstraintMatrix<T, Input = C::Input> {
[INFO] [stdout]     | |____________________________________________________________________- methods in this implementation
[INFO] [stdout] 157 |       fn objective(
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 177 |       fn constraint_a(mut self, a: A) -> Self {
[INFO] [stdout]     |          ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 182 |       fn constraint_b(mut self, b: Matrix<T>) -> Self {
[INFO] [stdout]     |          ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `build` is never used
[INFO] [stdout]    --> src/opti/mod.rs:190:5
[INFO] [stdout]     |
[INFO] [stdout] 188 | / impl<T, C, A> ConicOptiProblemBuilder<T, C, A>
[INFO] [stdout] 189 | | where T: Float, C: Cone<T>, A: ConstraintMatrix<T, Input = C::Input> {
[INFO] [stdout]     | |____________________________________________________________________- method in this implementation
[INFO] [stdout] 190 |       fn build(self) -> ConicOptiProblem<T, C, A> {
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `builder` is never used
[INFO] [stdout]    --> src/opti/mod.rs:211:5
[INFO] [stdout]     |
[INFO] [stdout] 209 | / impl<T, C, A> ConicOptiProblem<T, C, A>
[INFO] [stdout] 210 | | where T: Float, C: Cone<T>, A: ConstraintMatrix<T, Input = C::Input> {
[INFO] [stdout]     | |____________________________________________________________________- associated function in this implementation
[INFO] [stdout] 211 |       fn builder<B: ConstraintMatrix<T>>() -> ConicOptiProblemBuilder<T, DefaultCone, B> {
[INFO] [stdout]     |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solver` is never constructed
[INFO] [stdout]  --> src/opti/solver.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Solver;
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `short_step_algorithm` is never used
[INFO] [stdout]   --> src/opti/solver.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | / impl<T, C, A> ConicOptiProblem<T, C, A>
[INFO] [stdout] 12 | | where T: Float, C: Cone<T>, A: ConstraintMatrix<T, Input = C::Input> {
[INFO] [stdout]    | |____________________________________________________________________- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 17 |       fn short_step_algorithm(&self, eps: f64) {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/linalg/matrix/mod.rs:91:14
[INFO] [stdout]    |
[INFO] [stdout] 91 |     pub fn iter(&self) -> std::slice::Iter<T> {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 91 |     pub fn iter(&self) -> std::slice::Iter<'_, T> {
[INFO] [stdout]    |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/linalg/matrix/mod.rs:95:18
[INFO] [stdout]    |
[INFO] [stdout] 95 |     pub fn iter_mut(&mut self) -> std::slice::IterMut<T> {
[INFO] [stdout]    |                     ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 95 |     pub fn iter_mut(&mut self) -> std::slice::IterMut<'_, T> {
[INFO] [stdout]    |                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `libmatcompl` (lib) due to 2 previous errors; 15 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "fb47a0459df68b43fe44c700b2b3ae2060815128c2cd88d7da83aa4fa3e93034", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb47a0459df68b43fe44c700b2b3ae2060815128c2cd88d7da83aa4fa3e93034", kill_on_drop: false }`
[INFO] [stdout] fb47a0459df68b43fe44c700b2b3ae2060815128c2cd88d7da83aa4fa3e93034
