[INFO] cloning repository https://github.com/Dmarcano/autograd_rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Dmarcano/autograd_rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDmarcano%2Fautograd_rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDmarcano%2Fautograd_rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dd9100cb46d8468d22938d45020a50987eb4e805
[INFO] checking Dmarcano/autograd_rs/dd9100cb46d8468d22938d45020a50987eb4e805 against try#de0e80659cee4f27282e60d63bbb8c5271a0d147 for pr-129392
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDmarcano%2Fautograd_rs" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Dmarcano/autograd_rs on toolchain de0e80659cee4f27282e60d63bbb8c5271a0d147
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+de0e80659cee4f27282e60d63bbb8c5271a0d147" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Dmarcano/autograd_rs
[INFO] finished tweaking git repo https://github.com/Dmarcano/autograd_rs
[INFO] tweaked toml for git repo https://github.com/Dmarcano/autograd_rs written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Dmarcano/autograd_rs 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" "+de0e80659cee4f27282e60d63bbb8c5271a0d147" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+de0e80659cee4f27282e60d63bbb8c5271a0d147" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3419a36378ca2d0f77344ca2b82a14d19d61790a736c24ee35583df2fb7d2052
[INFO] running `Command { std: "docker" "start" "-a" "3419a36378ca2d0f77344ca2b82a14d19d61790a736c24ee35583df2fb7d2052", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3419a36378ca2d0f77344ca2b82a14d19d61790a736c24ee35583df2fb7d2052", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3419a36378ca2d0f77344ca2b82a14d19d61790a736c24ee35583df2fb7d2052", kill_on_drop: false }`
[INFO] [stdout] 3419a36378ca2d0f77344ca2b82a14d19d61790a736c24ee35583df2fb7d2052
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+de0e80659cee4f27282e60d63bbb8c5271a0d147" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b7823e6bb2a29bf04c84742c50a17b54ce3c7aab371ac5a5d435812be5eb3d73
[INFO] running `Command { std: "docker" "start" "-a" "b7823e6bb2a29bf04c84742c50a17b54ce3c7aab371ac5a5d435812be5eb3d73", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling libc v0.2.102
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking auto_ops v0.3.0
[INFO] [stderr]     Checking matrixmultiply v0.3.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking num-complex v0.4.0
[INFO] [stderr]     Checking approx v0.5.0
[INFO] [stderr]     Checking ndarray v0.15.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.26
[INFO] [stderr]     Checking thiserror v1.0.26
[INFO] [stderr]     Checking autograd_rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: call to `.deref()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/graph.rs:302:39
[INFO] [stdout]     |
[INFO] [stdout] 302 |         let x1_grad = x1.grad.as_ref().deref().borrow().clone();
[INFO] [stdout]     |                                       ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `RefCell<ArrayBase<OwnedRepr<f64>, Dim<[usize; 2]>>>` does not implement `Deref`, so calling `deref` on `&RefCell<ArrayBase<OwnedRepr<f64>, Dim<[usize; 2]>>>` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 302 -         let x1_grad = x1.grad.as_ref().deref().borrow().clone();
[INFO] [stdout] 302 +         let x1_grad = x1.grad.as_ref().borrow().clone();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.deref()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/graph.rs:303:39
[INFO] [stdout]     |
[INFO] [stdout] 303 |         let x2_grad = x2.grad.as_ref().deref().borrow().clone();
[INFO] [stdout]     |                                       ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `RefCell<ArrayBase<OwnedRepr<f64>, Dim<[usize; 2]>>>` does not implement `Deref`, so calling `deref` on `&RefCell<ArrayBase<OwnedRepr<f64>, Dim<[usize; 2]>>>` copies the reference, which does not do anything and can be removed
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 303 -         let x2_grad = x2.grad.as_ref().deref().borrow().clone();
[INFO] [stdout] 303 +         let x2_grad = x2.grad.as_ref().borrow().clone();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.70s
[INFO] running `Command { std: "docker" "inspect" "b7823e6bb2a29bf04c84742c50a17b54ce3c7aab371ac5a5d435812be5eb3d73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7823e6bb2a29bf04c84742c50a17b54ce3c7aab371ac5a5d435812be5eb3d73", kill_on_drop: false }`
[INFO] [stdout] b7823e6bb2a29bf04c84742c50a17b54ce3c7aab371ac5a5d435812be5eb3d73