[INFO] cloning repository https://github.com/oleh-nats/signal_slot
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/oleh-nats/signal_slot" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Foleh-nats%2Fsignal_slot", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Foleh-nats%2Fsignal_slot'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b598852ffde220f0bc4f45a56886bee4543e09dc
[INFO] building oleh-nats/signal_slot against try#334963c956d25708feab489a3816ae63f639355d for pr-135216
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Foleh-nats%2Fsignal_slot" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/oleh-nats/signal_slot on toolchain 334963c956d25708feab489a3816ae63f639355d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+334963c956d25708feab489a3816ae63f639355d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/oleh-nats/signal_slot
[INFO] finished tweaking git repo https://github.com/oleh-nats/signal_slot
[INFO] tweaked toml for git repo https://github.com/oleh-nats/signal_slot written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/oleh-nats/signal_slot 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" "+334963c956d25708feab489a3816ae63f639355d" "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-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+334963c956d25708feab489a3816ae63f639355d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b49b0a1d01601077df7c43f3271f92fc3b120ab692af2ba8af6103336bbb6826
[INFO] running `Command { std: "docker" "start" "-a" "b49b0a1d01601077df7c43f3271f92fc3b120ab692af2ba8af6103336bbb6826", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b49b0a1d01601077df7c43f3271f92fc3b120ab692af2ba8af6103336bbb6826", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b49b0a1d01601077df7c43f3271f92fc3b120ab692af2ba8af6103336bbb6826", kill_on_drop: false }`
[INFO] [stdout] b49b0a1d01601077df7c43f3271f92fc3b120ab692af2ba8af6103336bbb6826
[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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+334963c956d25708feab489a3816ae63f639355d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 23556d1dba272aa81e03f56ccfacf31e33e131e19cd76df326a40b00fa9c4ddb
[INFO] running `Command { std: "docker" "start" "-a" "23556d1dba272aa81e03f56ccfacf31e33e131e19cd76df326a40b00fa9c4ddb", kill_on_drop: false }`
[INFO] [stderr]    Compiling signal_slot v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused boxed `FnMut` trait object that must be used
[INFO] [stdout]   --> src/main.rs:28:13
[INFO] [stdout]    |
[INFO] [stdout] 28 |             self.observers.remove(index);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: closures are lazy and do nothing unless called
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `Command { std: "docker" "inspect" "23556d1dba272aa81e03f56ccfacf31e33e131e19cd76df326a40b00fa9c4ddb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23556d1dba272aa81e03f56ccfacf31e33e131e19cd76df326a40b00fa9c4ddb", kill_on_drop: false }`
[INFO] [stdout] 23556d1dba272aa81e03f56ccfacf31e33e131e19cd76df326a40b00fa9c4ddb
[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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+334963c956d25708feab489a3816ae63f639355d" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 10c07e20561980b715788e6f03bf5850a4609c4e24517460e46841d08595861e
[INFO] running `Command { std: "docker" "start" "-a" "10c07e20561980b715788e6f03bf5850a4609c4e24517460e46841d08595861e", kill_on_drop: false }`
[INFO] [stderr]    Compiling signal_slot v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused boxed `FnMut` trait object that must be used
[INFO] [stdout]   --> src/main.rs:28:13
[INFO] [stdout]    |
[INFO] [stdout] 28 |             self.observers.remove(index);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: closures are lazy and do nothing unless called
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "10c07e20561980b715788e6f03bf5850a4609c4e24517460e46841d08595861e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10c07e20561980b715788e6f03bf5850a4609c4e24517460e46841d08595861e", kill_on_drop: false }`
[INFO] [stdout] 10c07e20561980b715788e6f03bf5850a4609c4e24517460e46841d08595861e