[INFO] fetching crate discreet-common 0.1.0...
[INFO] checking discreet-common-0.1.0 against try#0611f7de057c584b8771102fde7aed6c70c71d3b for pr-146440
[INFO] extracting crate discreet-common 0.1.0 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate discreet-common 0.1.0
[INFO] finished tweaking crates.io crate discreet-common 0.1.0
[INFO] tweaked toml for crates.io crate discreet-common 0.1.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate discreet-common 0.1.0 on toolchain 0611f7de057c584b8771102fde7aed6c70c71d3b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate discreet-common 0.1.0 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 }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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_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" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e7720baf1511259f97aa8d700e53facedced0789798ef3f474e013dc9b2c7f50
[INFO] running `Command { std: "docker" "start" "-a" "e7720baf1511259f97aa8d700e53facedced0789798ef3f474e013dc9b2c7f50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e7720baf1511259f97aa8d700e53facedced0789798ef3f474e013dc9b2c7f50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7720baf1511259f97aa8d700e53facedced0789798ef3f474e013dc9b2c7f50", kill_on_drop: false }`
[INFO] [stdout] e7720baf1511259f97aa8d700e53facedced0789798ef3f474e013dc9b2c7f50
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 3998e3c67e15a53a533bf03b61e6832d90ff03895130585afc16526704d8e7b2
[INFO] running `Command { std: "docker" "start" "-a" "3998e3c67e15a53a533bf03b61e6832d90ff03895130585afc16526704d8e7b2", kill_on_drop: false }`
[INFO] [stderr]     Checking discreet-common v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait `Expression` is more private than the item `Derivative`
[INFO] [stdout]   --> src/diff_eq.rs:1:1
[INFO] [stdout]    |
[INFO] [stdout]  1 | pub struct Derivative<Expr: Expression, Variable: self::Variable> {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ struct `Derivative` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but trait `Expression` is only usable at visibility `pub(self)`
[INFO] [stdout]   --> src/diff_eq.rs:18:1
[INFO] [stdout]    |
[INFO] [stdout] 18 | trait Expression {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_bounds)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `discreet-common` (lib) due to 1 previous error; 4 warnings emitted
[INFO] [stdout] error: struct `Node2D` is never constructed
[INFO] [stdout]  --> src/lib.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Node2D<const I: usize, const J: usize> {
[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] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: field `value` is never read
[INFO] [stdout]  --> src/lib.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Node2D<const I: usize, const J: usize> {
[INFO] [stdout]   |            ------ field in this struct
[INFO] [stdout] 7 |     /// The value of this node when evaluating the finite difference operator on the stencil
[INFO] [stdout] 8 |     value: f64,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Expr` is never used
[INFO] [stdout]   --> src/diff_eq.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum Expr {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `eval` is never used
[INFO] [stdout]   --> src/diff_eq.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | trait Expression {
[INFO] [stdout]    |       ---------- associated function in this trait
[INFO] [stdout] 19 |     fn eval() -> Expr;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Expression` is more private than the item `Derivative`
[INFO] [stdout]   --> src/diff_eq.rs:1:1
[INFO] [stdout]    |
[INFO] [stdout]  1 | pub struct Derivative<Expr: Expression, Variable: self::Variable> {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ struct `Derivative` is reachable at visibility `pub`
[INFO] [stdout]    |
[INFO] [stdout] note: but trait `Expression` is only usable at visibility `pub(self)`
[INFO] [stdout]   --> src/diff_eq.rs:18:1
[INFO] [stdout]    |
[INFO] [stdout] 18 | trait Expression {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(private_bounds)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `Node2D` is never constructed
[INFO] [stdout]  --> src/lib.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Node2D<const I: usize, const J: usize> {
[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] warning: field `value` is never read
[INFO] [stdout]  --> src/lib.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Node2D<const I: usize, const J: usize> {
[INFO] [stdout]   |            ------ field in this struct
[INFO] [stdout] 7 |     /// The value of this node when evaluating the finite difference operator on the stencil
[INFO] [stdout] 8 |     value: f64,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Expr` is never used
[INFO] [stdout]   --> src/diff_eq.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum Expr {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `eval` is never used
[INFO] [stdout]   --> src/diff_eq.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 18 | trait Expression {
[INFO] [stdout]    |       ---------- associated function in this trait
[INFO] [stdout] 19 |     fn eval() -> Expr;
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `discreet-common` (lib test) due to 1 previous error; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "3998e3c67e15a53a533bf03b61e6832d90ff03895130585afc16526704d8e7b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3998e3c67e15a53a533bf03b61e6832d90ff03895130585afc16526704d8e7b2", kill_on_drop: false }`
[INFO] [stdout] 3998e3c67e15a53a533bf03b61e6832d90ff03895130585afc16526704d8e7b2
