[INFO] cloning repository https://github.com/xhook/rustagrad
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xhook/rustagrad" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxhook%2Frustagrad", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxhook%2Frustagrad'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 95578ed59eea5922ca61c89f4d98f0e1c5190534
[INFO] checking xhook/rustagrad against try#54e27f559f23913c1d5afb1a0f0114e9e61b81b8 for pr-147589
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxhook%2Frustagrad" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/xhook/rustagrad
[INFO] finished tweaking git repo https://github.com/xhook/rustagrad
[INFO] tweaked toml for git repo https://github.com/xhook/rustagrad written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/xhook/rustagrad on toolchain 54e27f559f23913c1d5afb1a0f0114e9e61b81b8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+54e27f559f23913c1d5afb1a0f0114e9e61b81b8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/xhook/rustagrad 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" "+54e27f559f23913c1d5afb1a0f0114e9e61b81b8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded append-only-vec v0.1.2
[INFO] [stderr]   Downloaded elsa v1.7.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+54e27f559f23913c1d5afb1a0f0114e9e61b81b8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b86796bab3b0ac2242bab549a6ef0b207340245ecaf495b38261feb7846148fc
[INFO] running `Command { std: "docker" "start" "-a" "b86796bab3b0ac2242bab549a6ef0b207340245ecaf495b38261feb7846148fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b86796bab3b0ac2242bab549a6ef0b207340245ecaf495b38261feb7846148fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b86796bab3b0ac2242bab549a6ef0b207340245ecaf495b38261feb7846148fc", kill_on_drop: false }`
[INFO] [stdout] b86796bab3b0ac2242bab549a6ef0b207340245ecaf495b38261feb7846148fc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+54e27f559f23913c1d5afb1a0f0114e9e61b81b8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 00f24caa3ee763060731ffe130dd17eaa99dc07fd4288230721166334697b2c3
[INFO] running `Command { std: "docker" "start" "-a" "00f24caa3ee763060731ffe130dd17eaa99dc07fd4288230721166334697b2c3", kill_on_drop: false }`
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking append-only-vec v0.1.2
[INFO] [stderr]     Checking elsa v1.7.0
[INFO] [stderr]     Checking rustagrad v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `HashMap`
[INFO] [stdout]  --> src/grad_rc.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]   |                        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `append_only_vec::AppendOnlyVec`
[INFO] [stdout]  --> src/grad_rc.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use append_only_vec::AppendOnlyVec;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `elsa::FrozenMap`
[INFO] [stdout]  --> src/grad_rc.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use elsa::FrozenMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/grad_rc.rs:58:25
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     let mut left = left_rc.borrow_mut();
[INFO] [stdout]    |                         ----^^^^
[INFO] [stdout]    |                         |
[INFO] [stdout]    |                         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/grad_rc.rs:59:25
[INFO] [stdout]    |
[INFO] [stdout] 59 |                     let mut right = right_rc.borrow_mut();
[INFO] [stdout]    |                         ----^^^^^
[INFO] [stdout]    |                         |
[INFO] [stdout]    |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0594]: cannot assign to data in an `Rc`
[INFO] [stdout]   --> src/grad_rc.rs:60:21
[INFO] [stdout]    |
[INFO] [stdout] 60 |                     (**left).grad = right.grad + x.grad;
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot assign
[INFO] [stdout]    |
[INFO] [stdout]    = help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `Rc<grad_rc::Value>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0594]: cannot assign to data in an `Rc`
[INFO] [stdout]   --> src/grad_rc.rs:61:21
[INFO] [stdout]    |
[INFO] [stdout] 61 |                     (**right).grad = left.grad + x.grad;
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot assign
[INFO] [stdout]    |
[INFO] [stdout]    = help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `Rc<grad_rc::Value>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0507]: cannot move out of a shared reference
[INFO] [stdout]   --> src/grad_rc.rs:75:27
[INFO] [stdout]    |
[INFO] [stdout] 75 |             for &child in v.children.iter() {
[INFO] [stdout]    |                  -----    ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  data moved here
[INFO] [stdout]    |                  move occurs because `child` has type `Rc<grad_rc::Value>`, which does not implement the `Copy` trait
[INFO] [stdout]    |
[INFO] [stdout] help: consider removing the borrow
[INFO] [stdout]    |
[INFO] [stdout] 75 -             for &child in v.children.iter() {
[INFO] [stdout] 75 +             for child in v.children.iter() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/main.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |         let value = Value {
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]   --> src/main.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let v2 = s.value(20f32);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v3`
[INFO] [stdout]   --> src/main.rs:33:13
[INFO] [stdout]    |
[INFO] [stdout] 33 |         let v3 = s.value(30f32);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_v3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v4`
[INFO] [stdout]   --> src/main.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let v4 = s.value(40f32);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_v4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v5`
[INFO] [stdout]   --> src/main.rs:35:13
[INFO] [stdout]    |
[INFO] [stdout] 35 |         let v5 = s.value(50f32);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_v5`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0507, E0594.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0507`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashMap`
[INFO] [stdout]  --> src/grad_rc.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]   |                        ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `append_only_vec::AppendOnlyVec`
[INFO] [stdout]  --> src/grad_rc.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use append_only_vec::AppendOnlyVec;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `elsa::FrozenMap`
[INFO] [stdout]  --> src/grad_rc.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use elsa::FrozenMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustagrad` (bin "rustagrad") due to 3 previous errors; 10 warnings emitted
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/grad_rc.rs:58:25
[INFO] [stdout]    |
[INFO] [stdout] 58 |                     let mut left = left_rc.borrow_mut();
[INFO] [stdout]    |                         ----^^^^
[INFO] [stdout]    |                         |
[INFO] [stdout]    |                         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/grad_rc.rs:59:25
[INFO] [stdout]    |
[INFO] [stdout] 59 |                     let mut right = right_rc.borrow_mut();
[INFO] [stdout]    |                         ----^^^^^
[INFO] [stdout]    |                         |
[INFO] [stdout]    |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0594]: cannot assign to data in an `Rc`
[INFO] [stdout]   --> src/grad_rc.rs:60:21
[INFO] [stdout]    |
[INFO] [stdout] 60 |                     (**left).grad = right.grad + x.grad;
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot assign
[INFO] [stdout]    |
[INFO] [stdout]    = help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `Rc<grad_rc::Value>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0594]: cannot assign to data in an `Rc`
[INFO] [stdout]   --> src/grad_rc.rs:61:21
[INFO] [stdout]    |
[INFO] [stdout] 61 |                     (**right).grad = left.grad + x.grad;
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot assign
[INFO] [stdout]    |
[INFO] [stdout]    = help: trait `DerefMut` is required to modify through a dereference, but it is not implemented for `Rc<grad_rc::Value>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0507]: cannot move out of a shared reference
[INFO] [stdout]   --> src/grad_rc.rs:75:27
[INFO] [stdout]    |
[INFO] [stdout] 75 |             for &child in v.children.iter() {
[INFO] [stdout]    |                  -----    ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  data moved here
[INFO] [stdout]    |                  move occurs because `child` has type `Rc<grad_rc::Value>`, which does not implement the `Copy` trait
[INFO] [stdout]    |
[INFO] [stdout] help: consider removing the borrow
[INFO] [stdout]    |
[INFO] [stdout] 75 -             for &child in v.children.iter() {
[INFO] [stdout] 75 +             for child in v.children.iter() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/main.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |         let value = Value {
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]   --> src/main.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let v2 = s.value(20f32);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v3`
[INFO] [stdout]   --> src/main.rs:33:13
[INFO] [stdout]    |
[INFO] [stdout] 33 |         let v3 = s.value(30f32);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_v3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v4`
[INFO] [stdout]   --> src/main.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |         let v4 = s.value(40f32);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_v4`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v5`
[INFO] [stdout]   --> src/main.rs:35:13
[INFO] [stdout]    |
[INFO] [stdout] 35 |         let v5 = s.value(50f32);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_v5`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0507, E0594.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0507`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustagrad` (bin "rustagrad" test) due to 3 previous errors; 10 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "00f24caa3ee763060731ffe130dd17eaa99dc07fd4288230721166334697b2c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00f24caa3ee763060731ffe130dd17eaa99dc07fd4288230721166334697b2c3", kill_on_drop: false }`
[INFO] [stdout] 00f24caa3ee763060731ffe130dd17eaa99dc07fd4288230721166334697b2c3
