[INFO] fetching crate varint 0.9.0...
[INFO] checking varint-0.9.0 against master#7f5a42b073dc2bee2aa625052eb066ee07072048 for pr-78991
[INFO] extracting crate varint 0.9.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate varint 0.9.0 on toolchain 7f5a42b073dc2bee2aa625052eb066ee07072048
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate varint 0.9.0
[INFO] finished tweaking crates.io crate varint 0.9.0
[INFO] tweaked toml for crates.io crate varint 0.9.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c04cdf1e257b933c3dc9f1c92cafb13735a4ee003c1daf85a4266d4bdd86382f
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c04cdf1e257b933c3dc9f1c92cafb13735a4ee003c1daf85a4266d4bdd86382f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c04cdf1e257b933c3dc9f1c92cafb13735a4ee003c1daf85a4266d4bdd86382f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c04cdf1e257b933c3dc9f1c92cafb13735a4ee003c1daf85a4266d4bdd86382f", kill_on_drop: false }`
[INFO] [stdout] c04cdf1e257b933c3dc9f1c92cafb13735a4ee003c1daf85a4266d4bdd86382f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b63a7c1fc66adea9b23595b11694e7c287b636ebd48c04a6c5f9394ab2f13aa5
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b63a7c1fc66adea9b23595b11694e7c287b636ebd48c04a6c5f9394ab2f13aa5", kill_on_drop: false }`
[INFO] [stderr]     Checking bit_utils v0.1.1
[INFO] [stderr]     Checking varint v0.9.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `next_byte` is never read
[INFO] [stdout]   --> src/rawio.rs:37:13
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let mut next_byte: u8 = 0;
[INFO] [stdout]    |             ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `next_byte` is never read
[INFO] [stdout]   --> src/rawio.rs:37:13
[INFO] [stdout]    |
[INFO] [stdout] 37 |         let mut next_byte: u8 = 0;
[INFO] [stdout]    |             ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.73s
[INFO] running `Command { std: "docker" "inspect" "b63a7c1fc66adea9b23595b11694e7c287b636ebd48c04a6c5f9394ab2f13aa5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b63a7c1fc66adea9b23595b11694e7c287b636ebd48c04a6c5f9394ab2f13aa5", kill_on_drop: false }`
[INFO] [stdout] b63a7c1fc66adea9b23595b11694e7c287b636ebd48c04a6c5f9394ab2f13aa5