[INFO] fetching crate light_merkle 0.1.0...
[INFO] checking light_merkle-0.1.0 against master#38352b01ae4af9300be03b805d6db68c45e51068 for pr-129864
[INFO] extracting crate light_merkle 0.1.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate light_merkle 0.1.0 on toolchain 38352b01ae4af9300be03b805d6db68c45e51068
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate light_merkle 0.1.0
[INFO] finished tweaking crates.io crate light_merkle 0.1.0
[INFO] tweaked toml for crates.io crate light_merkle 0.1.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 22 packages to latest compatible versions
[INFO] [stderr]       Adding generic-array v0.14.7 (available: v1.1.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b49ed32761330b47b16871cccb0c0d6d0f1149064ae88dac9c191527f3cdfc21
[INFO] running `Command { std: "docker" "start" "-a" "b49ed32761330b47b16871cccb0c0d6d0f1149064ae88dac9c191527f3cdfc21", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b49ed32761330b47b16871cccb0c0d6d0f1149064ae88dac9c191527f3cdfc21", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b49ed32761330b47b16871cccb0c0d6d0f1149064ae88dac9c191527f3cdfc21", kill_on_drop: false }`
[INFO] [stdout] b49ed32761330b47b16871cccb0c0d6d0f1149064ae88dac9c191527f3cdfc21
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e79af6a9207cfe07ca042853097a8c8e638235f15d657f83a0ea1fb71ee96f21
[INFO] running `Command { std: "docker" "start" "-a" "e79af6a9207cfe07ca042853097a8c8e638235f15d657f83a0ea1fb71ee96f21", kill_on_drop: false }`
[INFO] [stderr]     Checking serde_json v1.0.128
[INFO] [stderr]     Checking sha3 v0.10.8
[INFO] [stderr]     Checking light_merkle v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `sha2::Digest`
[INFO] [stdout]  --> src/light_merkle.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use sha2::Digest;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `hash` is never read
[INFO] [stdout]    --> src/light_merkle.rs:218:25
[INFO] [stdout]     |
[INFO] [stdout] 218 |                         hash = &(String::from("0x") + hash_.as_str());
[INFO] [stdout]     |                         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `hash` is never read
[INFO] [stdout]    --> src/light_merkle.rs:218:25
[INFO] [stdout]     |
[INFO] [stdout] 218 |                         hash = &(String::from("0x") + hash_.as_str());
[INFO] [stdout]     |                         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.35s
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "e79af6a9207cfe07ca042853097a8c8e638235f15d657f83a0ea1fb71ee96f21", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e79af6a9207cfe07ca042853097a8c8e638235f15d657f83a0ea1fb71ee96f21", kill_on_drop: false }`
[INFO] [stdout] e79af6a9207cfe07ca042853097a8c8e638235f15d657f83a0ea1fb71ee96f21