[INFO] fetching crate gradiff 0.1.0-rc9...
[INFO] checking gradiff-0.1.0-rc9 against master#e4106065bf1bb515935d5d024e8d9c86454e2b22 for pr-112160
[INFO] extracting crate gradiff 0.1.0-rc9 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate gradiff 0.1.0-rc9 on toolchain e4106065bf1bb515935d5d024e8d9c86454e2b22
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate gradiff 0.1.0-rc9
[INFO] finished tweaking crates.io crate gradiff 0.1.0-rc9
[INFO] tweaked toml for crates.io crate gradiff 0.1.0-rc9 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded peeking_take_while v1.0.0
[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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b1b0bb462916aa26aeff4557d3b401e3d0e1aa88e6bcba0fd6d0a2e4962b44d9
[INFO] running `Command { std: "docker" "start" "-a" "b1b0bb462916aa26aeff4557d3b401e3d0e1aa88e6bcba0fd6d0a2e4962b44d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b1b0bb462916aa26aeff4557d3b401e3d0e1aa88e6bcba0fd6d0a2e4962b44d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1b0bb462916aa26aeff4557d3b401e3d0e1aa88e6bcba0fd6d0a2e4962b44d9", kill_on_drop: false }`
[INFO] [stdout] b1b0bb462916aa26aeff4557d3b401e3d0e1aa88e6bcba0fd6d0a2e4962b44d9
[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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e4106065bf1bb515935d5d024e8d9c86454e2b22" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c9830b2aed2aab2ce6ef9c19e066e28c833c45138c767d89e007862b2f65d02b
[INFO] running `Command { std: "docker" "start" "-a" "c9830b2aed2aab2ce6ef9c19e066e28c833c45138c767d89e007862b2f65d02b", kill_on_drop: false }`
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]     Checking maplit v1.0.2
[INFO] [stderr]     Checking peeking_take_while v1.0.0
[INFO] [stderr]     Checking diff v0.1.13
[INFO] [stderr]     Checking yansi v0.5.1
[INFO] [stderr]     Checking gradiff v0.1.0-rc9 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking pretty_assertions v1.3.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling test-case-macros v2.2.2
[INFO] [stderr]     Checking test-case v2.2.2
[INFO] [stdout] warning: using `.borrow()` on a double reference, which returns `&Ref<'_, DiagramObject>` instead of borrowing the inner type
[INFO] [stdout]   --> tests/blank_canvas.rs:93:46
[INFO] [stdout]    |
[INFO] [stdout] 93 |     assert_eq!(view.current_canvas().unwrap().borrow().deref(), raw_canvas.deref());
[INFO] [stdout]    |                                              ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.borrow()` on a double reference, which returns `&Ref<'_, DiagramObject>` instead of borrowing the inner type
[INFO] [stdout]    --> tests/hello_world.rs:114:46
[INFO] [stdout]     |
[INFO] [stdout] 114 |     assert_eq!(view.current_canvas().unwrap().borrow().deref(), raw_canvas.deref());
[INFO] [stdout]     |                                              ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.25s
[INFO] running `Command { std: "docker" "inspect" "c9830b2aed2aab2ce6ef9c19e066e28c833c45138c767d89e007862b2f65d02b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9830b2aed2aab2ce6ef9c19e066e28c833c45138c767d89e007862b2f65d02b", kill_on_drop: false }`
[INFO] [stdout] c9830b2aed2aab2ce6ef9c19e066e28c833c45138c767d89e007862b2f65d02b