[INFO] cloning repository https://github.com/ylloc/rust-minigrad
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ylloc/rust-minigrad" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fylloc%2Frust-minigrad", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fylloc%2Frust-minigrad'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 67ff47b52465cbbabb3757b5508bf6ae360ecf14
[INFO] building ylloc/rust-minigrad against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fylloc%2Frust-minigrad" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ylloc/rust-minigrad on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ylloc/rust-minigrad
[INFO] finished tweaking git repo https://github.com/ylloc/rust-minigrad
[INFO] tweaked toml for git repo https://github.com/ylloc/rust-minigrad written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ylloc/rust-minigrad 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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "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-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 457d947ee968db7b5cef982c1863bc274bda941e66464c007a47c4ceb61966cf
[INFO] running `Command { std: "docker" "start" "-a" "457d947ee968db7b5cef982c1863bc274bda941e66464c007a47c4ceb61966cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "457d947ee968db7b5cef982c1863bc274bda941e66464c007a47c4ceb61966cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "457d947ee968db7b5cef982c1863bc274bda941e66464c007a47c4ceb61966cf", kill_on_drop: false }`
[INFO] [stdout] 457d947ee968db7b5cef982c1863bc274bda941e66464c007a47c4ceb61966cf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 32e8a4c51dafc47797df66de2ca246f5678a58faabb471f6bde7815207aa1d69
[INFO] running `Command { std: "docker" "start" "-a" "32e8a4c51dafc47797df66de2ca246f5678a58faabb471f6bde7815207aa1d69", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling auto_ops v0.3.0
[INFO] [stderr]    Compiling getrandom v0.2.12
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling rust_minigrad v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `core_intrinsics` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout]   = note: `#[warn(internal_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/variable.rs:218:23
[INFO] [stdout]     |
[INFO] [stdout] 218 |             let val = (x.children[0].borrow_mut().data);
[INFO] [stdout]     |                       ^                               ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 218 -             let val = (x.children[0].borrow_mut().data);
[INFO] [stdout] 218 +             let val = x.children[0].borrow_mut().data;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/tensor.rs:269:21
[INFO] [stdout]     |
[INFO] [stdout] 269 |         let x = self.clone().exp();
[INFO] [stdout]     |                     ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `Tensor1D` does not implement `Clone`, so calling `clone` on `&Tensor1D` 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] 269 -         let x = self.clone().exp();
[INFO] [stdout] 269 +         let x = self.exp();
[INFO] [stdout]     |
[INFO] [stdout] help: if you meant to clone `Tensor1D`, implement `Clone` for it
[INFO] [stdout]     |
[INFO] [stdout] 7   + #[derive(Clone)]
[INFO] [stdout] 8   | pub struct Tensor1D(pub Rc<RefCell<Vec<Variable>>>, pub usize);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.12s
[INFO] running `Command { std: "docker" "inspect" "32e8a4c51dafc47797df66de2ca246f5678a58faabb471f6bde7815207aa1d69", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "32e8a4c51dafc47797df66de2ca246f5678a58faabb471f6bde7815207aa1d69", kill_on_drop: false }`
[INFO] [stdout] 32e8a4c51dafc47797df66de2ca246f5678a58faabb471f6bde7815207aa1d69
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3840cdb06fdf9248bba1e016f727e96fceb6232436527ae0a3ea5bc69f346bef
[INFO] running `Command { std: "docker" "start" "-a" "3840cdb06fdf9248bba1e016f727e96fceb6232436527ae0a3ea5bc69f346bef", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_minigrad v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `core_intrinsics` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout]   = note: `#[warn(internal_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/variable.rs:218:23
[INFO] [stdout]     |
[INFO] [stdout] 218 |             let val = (x.children[0].borrow_mut().data);
[INFO] [stdout]     |                       ^                               ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 218 -             let val = (x.children[0].borrow_mut().data);
[INFO] [stdout] 218 +             let val = x.children[0].borrow_mut().data;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/tensor.rs:269:21
[INFO] [stdout]     |
[INFO] [stdout] 269 |         let x = self.clone().exp();
[INFO] [stdout]     |                     ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `Tensor1D` does not implement `Clone`, so calling `clone` on `&Tensor1D` 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] 269 -         let x = self.clone().exp();
[INFO] [stdout] 269 +         let x = self.exp();
[INFO] [stdout]     |
[INFO] [stdout] help: if you meant to clone `Tensor1D`, implement `Clone` for it
[INFO] [stdout]     |
[INFO] [stdout] 7   + #[derive(Clone)]
[INFO] [stdout] 8   | pub struct Tensor1D(pub Rc<RefCell<Vec<Variable>>>, pub usize);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::random`
[INFO] [stdout]  --> tests/test_ops.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::random;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Operation`, `Tensor1D`, `Tensor2D`, `VariableData`, and `Variable`
[INFO] [stdout]  --> tests/test_ops.rs:2:21
[INFO] [stdout]   |
[INFO] [stdout] 2 | use rust_minigrad::{Operation, Tensor1D, Tensor2D, Variable, VariableData};
[INFO] [stdout]   |                     ^^^^^^^^^  ^^^^^^^^  ^^^^^^^^  ^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Tensor1D`
[INFO] [stdout]  --> tests/test_ops.rs:6:25
[INFO] [stdout]   |
[INFO] [stdout] 6 |     use rust_minigrad::{Tensor1D, Variable};
[INFO] [stdout]   |                         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `core_intrinsics` is internal to the compiler or standard library
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: using it is strongly discouraged
[INFO] [stdout]   = note: `#[warn(internal_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/variable.rs:218:23
[INFO] [stdout]     |
[INFO] [stdout] 218 |             let val = (x.children[0].borrow_mut().data);
[INFO] [stdout]     |                       ^                               ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 218 -             let val = (x.children[0].borrow_mut().data);
[INFO] [stdout] 218 +             let val = x.children[0].borrow_mut().data;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `cnt` is assigned to, but never used
[INFO] [stdout]    --> tests/tensor_test.rs:183:17
[INFO] [stdout]     |
[INFO] [stdout] 183 |         let mut cnt = 1;
[INFO] [stdout]     |                 ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_cnt` instead
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> tests/tensor_test.rs:232:13
[INFO] [stdout]     |
[INFO] [stdout] 232 |         let y = x.clone();
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]    --> tests/tensor_test.rs:305:13
[INFO] [stdout]     |
[INFO] [stdout] 305 |         let z = Variable::from(2.) * x;
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/tensor.rs:269:21
[INFO] [stdout]     |
[INFO] [stdout] 269 |         let x = self.clone().exp();
[INFO] [stdout]     |                     ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `Tensor1D` does not implement `Clone`, so calling `clone` on `&Tensor1D` 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] 269 -         let x = self.clone().exp();
[INFO] [stdout] 269 +         let x = self.exp();
[INFO] [stdout]     |
[INFO] [stdout] help: if you meant to clone `Tensor1D`, implement `Clone` for it
[INFO] [stdout]     |
[INFO] [stdout] 7   + #[derive(Clone)]
[INFO] [stdout] 8   | pub struct Tensor1D(pub Rc<RefCell<Vec<Variable>>>, pub usize);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.27s
[INFO] running `Command { std: "docker" "inspect" "3840cdb06fdf9248bba1e016f727e96fceb6232436527ae0a3ea5bc69f346bef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3840cdb06fdf9248bba1e016f727e96fceb6232436527ae0a3ea5bc69f346bef", kill_on_drop: false }`
[INFO] [stdout] 3840cdb06fdf9248bba1e016f727e96fceb6232436527ae0a3ea5bc69f346bef