[INFO] cloning repository https://github.com/jw1912/diffable
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jw1912/diffable" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjw1912%2Fdiffable", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjw1912%2Fdiffable'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 95e0fbd8edc4c8a9f6a723a04d6aa5bb8da4708b
[INFO] checking jw1912/diffable against master#85c39893a761fe4c050523278da4e7e45ab42b6e for pr-134688
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjw1912%2Fdiffable" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jw1912/diffable on toolchain 85c39893a761fe4c050523278da4e7e45ab42b6e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+85c39893a761fe4c050523278da4e7e45ab42b6e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jw1912/diffable
[INFO] finished tweaking git repo https://github.com/jw1912/diffable
[INFO] tweaked toml for git repo https://github.com/jw1912/diffable written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/jw1912/diffable 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" "+85c39893a761fe4c050523278da4e7e45ab42b6e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+85c39893a761fe4c050523278da4e7e45ab42b6e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 422bb6b734ab817fd8da213ac8bc7f2f06c71687c473a683b0d6a99cd558b279
[INFO] running `Command { std: "docker" "start" "-a" "422bb6b734ab817fd8da213ac8bc7f2f06c71687c473a683b0d6a99cd558b279", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "422bb6b734ab817fd8da213ac8bc7f2f06c71687c473a683b0d6a99cd558b279", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "422bb6b734ab817fd8da213ac8bc7f2f06c71687c473a683b0d6a99cd558b279", kill_on_drop: false }`
[INFO] [stdout] 422bb6b734ab817fd8da213ac8bc7f2f06c71687c473a683b0d6a99cd558b279
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "-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" "+85c39893a761fe4c050523278da4e7e45ab42b6e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 72ab8b5437d6c008f7984f6d6fa332905d27ba5bdd1a031fbd44e3bc5bf2c53b
[INFO] running `Command { std: "docker" "start" "-a" "72ab8b5437d6c008f7984f6d6fa332905d27ba5bdd1a031fbd44e3bc5bf2c53b", kill_on_drop: false }`
[INFO] [stderr]     Checking diffable v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0502]: cannot borrow `*inputs` as immutable because it is also borrowed as mutable
[INFO] [stdout]    --> examples/basic.rs:239:39
[INFO] [stdout]     |
[INFO] [stdout] 238 |             if let Some(grd) = inputs[a].grad.as_mut() {
[INFO] [stdout]     |                                -------------- mutable borrow occurs here
[INFO] [stdout] 239 |                 *grd += output_grad * inputs[b].val;
[INFO] [stdout]     |                 ----------------------^^^^^^^^^----
[INFO] [stdout]     |                 |                     |
[INFO] [stdout]     |                 |                     immutable borrow occurs here
[INFO] [stdout]     |                 mutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `*inputs` as immutable because it is also borrowed as mutable
[INFO] [stdout]    --> examples/basic.rs:265:22
[INFO] [stdout]     |
[INFO] [stdout] 263 |           if let Some(grd) = inputs[0].grad.as_mut() {
[INFO] [stdout]     |                              -------------- mutable borrow occurs here
[INFO] [stdout] 264 | /             *grd += output_grad
[INFO] [stdout] 265 | |                 * if inputs[0].val > 0.0 {
[INFO] [stdout]     | |                      ^^^^^^^^^ immutable borrow occurs here
[INFO] [stdout] 266 | |                     1.0
[INFO] [stdout] 267 | |                 } else if inputs[0].val == 0.0 {
[INFO] [stdout] ...   |
[INFO] [stdout] 270 | |                     -1.0
[INFO] [stdout] 271 | |                 };
[INFO] [stdout]     | |_________________- mutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `*inputs` as immutable because it is also borrowed as mutable
[INFO] [stdout]    --> examples/basic.rs:267:27
[INFO] [stdout]     |
[INFO] [stdout] 263 |           if let Some(grd) = inputs[0].grad.as_mut() {
[INFO] [stdout]     |                              -------------- mutable borrow occurs here
[INFO] [stdout] 264 | /             *grd += output_grad
[INFO] [stdout] 265 | |                 * if inputs[0].val > 0.0 {
[INFO] [stdout] 266 | |                     1.0
[INFO] [stdout] 267 | |                 } else if inputs[0].val == 0.0 {
[INFO] [stdout]     | |                           ^^^^^^^^^ immutable borrow occurs here
[INFO] [stdout] ...   |
[INFO] [stdout] 270 | |                     -1.0
[INFO] [stdout] 271 | |                 };
[INFO] [stdout]     | |_________________- mutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `diffable` (example "basic") due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "72ab8b5437d6c008f7984f6d6fa332905d27ba5bdd1a031fbd44e3bc5bf2c53b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72ab8b5437d6c008f7984f6d6fa332905d27ba5bdd1a031fbd44e3bc5bf2c53b", kill_on_drop: false }`
[INFO] [stdout] 72ab8b5437d6c008f7984f6d6fa332905d27ba5bdd1a031fbd44e3bc5bf2c53b