[INFO] fetching crate thwack 0.4.2...
[INFO] checking thwack-0.4.2 against master#0599f3403366d9c57f0625e6de3af214b5042a90 for pr-87710
[INFO] extracting crate thwack 0.4.2 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate thwack 0.4.2 on toolchain 0599f3403366d9c57f0625e6de3af214b5042a90
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate thwack 0.4.2
[INFO] finished tweaking crates.io crate thwack 0.4.2
[INFO] tweaked toml for crates.io crate thwack 0.4.2 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate thwack 0.4.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a7f3aecffc4657da4b0e4542b1b736952467a654bd30f79fe963f2719fde59ae
[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" "a7f3aecffc4657da4b0e4542b1b736952467a654bd30f79fe963f2719fde59ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7f3aecffc4657da4b0e4542b1b736952467a654bd30f79fe963f2719fde59ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7f3aecffc4657da4b0e4542b1b736952467a654bd30f79fe963f2719fde59ae", kill_on_drop: false }`
[INFO] [stdout] a7f3aecffc4657da4b0e4542b1b736952467a654bd30f79fe963f2719fde59ae
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 96f949d8b86aeaf0e78e880fcb9f20b3717510699abb99c2f257583c08959914
[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" "96f949d8b86aeaf0e78e880fcb9f20b3717510699abb99c2f257583c08959914", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.100
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling signal-hook v0.3.9
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking unicode-segmentation v1.8.0
[INFO] [stderr]     Checking lock_api v0.4.4
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking log v0.4.14
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking parking_lot_core v0.8.3
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking mio v0.7.13
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking signal-hook-mio v0.2.1
[INFO] [stderr]     Checking crossterm v0.21.0
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking thwack v0.4.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking tempfile v3.2.0
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> tests/helper.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 | /         &self.inner.iter().for_each(|v| {
[INFO] [stdout] 66 | |             for e in escape_default(*v) {
[INFO] [stdout] 67 | |                 buf.push(e);
[INFO] [stdout] 68 | |             }
[INFO] [stdout] 69 | |         });
[INFO] [stdout]    | |__________^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 65 |         let _ = &self.inner.iter().for_each(|v| {
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> tests/helper.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 | /         &self.inner.iter().for_each(|v| {
[INFO] [stdout] 66 | |             for e in escape_default(*v) {
[INFO] [stdout] 67 | |                 buf.push(e);
[INFO] [stdout] 68 | |             }
[INFO] [stdout] 69 | |         });
[INFO] [stdout]    | |__________^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 65 |         let _ = &self.inner.iter().for_each(|v| {
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> tests/helper.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 | /         &self.inner.iter().for_each(|v| {
[INFO] [stdout] 66 | |             for e in escape_default(*v) {
[INFO] [stdout] 67 | |                 buf.push(e);
[INFO] [stdout] 68 | |             }
[INFO] [stdout] 69 | |         });
[INFO] [stdout]    | |__________^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 65 |         let _ = &self.inner.iter().for_each(|v| {
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> tests/helper.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 | /         &self.inner.iter().for_each(|v| {
[INFO] [stdout] 66 | |             for e in escape_default(*v) {
[INFO] [stdout] 67 | |                 buf.push(e);
[INFO] [stdout] 68 | |             }
[INFO] [stdout] 69 | |         });
[INFO] [stdout]    | |__________^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 65 |         let _ = &self.inner.iter().for_each(|v| {
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.98s
[INFO] running `Command { std: "docker" "inspect" "96f949d8b86aeaf0e78e880fcb9f20b3717510699abb99c2f257583c08959914", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96f949d8b86aeaf0e78e880fcb9f20b3717510699abb99c2f257583c08959914", kill_on_drop: false }`
[INFO] [stdout] 96f949d8b86aeaf0e78e880fcb9f20b3717510699abb99c2f257583c08959914