[INFO] cloning repository https://github.com/Aaqib-kk/Asynchronous_Rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Aaqib-kk/Asynchronous_Rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAaqib-kk%2FAsynchronous_Rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAaqib-kk%2FAsynchronous_Rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b6f6d0c78506276315082121254c108c69f997c9
[INFO] checking Aaqib-kk/Asynchronous_Rust against try#8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8 for pr-82565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAaqib-kk%2FAsynchronous_Rust" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] [stderr] Updating files:  30% (433/1409)
Updating files:  31% (437/1409)
Updating files:  32% (451/1409)
Updating files:  33% (465/1409)
Updating files:  34% (480/1409)
Updating files:  35% (494/1409)
Updating files:  36% (508/1409)
Updating files:  36% (517/1409)
Updating files:  37% (522/1409)
Updating files:  38% (536/1409)
Updating files:  39% (550/1409)
Updating files:  40% (564/1409)
Updating files:  41% (578/1409)
Updating files:  41% (587/1409)
Updating files:  42% (592/1409)
Updating files:  43% (606/1409)
Updating files:  44% (620/1409)
Updating files:  45% (635/1409)
Updating files:  46% (649/1409)
Updating files:  47% (663/1409)
Updating files:  48% (677/1409)
Updating files:  49% (691/1409)
Updating files:  50% (705/1409)
Updating files:  51% (719/1409)
Updating files:  52% (733/1409)
Updating files:  53% (747/1409)
Updating files:  54% (761/1409)
Updating files:  55% (775/1409)
Updating files:  56% (790/1409)
Updating files:  57% (804/1409)
Updating files:  58% (818/1409)
Updating files:  59% (832/1409)
Updating files:  60% (846/1409)
Updating files:  61% (860/1409)
Updating files:  62% (874/1409)
Updating files:  63% (888/1409)
Updating files:  64% (902/1409)
Updating files:  65% (916/1409)
Updating files:  66% (930/1409)
Updating files:  67% (945/1409)
Updating files:  68% (959/1409)
Updating files:  69% (973/1409)
Updating files:  70% (987/1409)
Updating files:  71% (1001/1409)
Updating files:  72% (1015/1409)
Updating files:  73% (1029/1409)
Updating files:  74% (1043/1409)
Updating files:  75% (1057/1409)
Updating files:  76% (1071/1409)
Updating files:  77% (1085/1409)
Updating files:  78% (1100/1409)
Updating files:  79% (1114/1409)
Updating files:  80% (1128/1409)
Updating files:  81% (1142/1409)
Updating files:  82% (1156/1409)
Updating files:  83% (1170/1409)
Updating files:  84% (1184/1409)
Updating files:  85% (1198/1409)
Updating files:  86% (1212/1409)
Updating files:  87% (1226/1409)
Updating files:  88% (1240/1409)
Updating files:  88% (1248/1409)
Updating files:  89% (1255/1409)
Updating files:  90% (1269/1409)
Updating files:  91% (1283/1409)
Updating files:  92% (1297/1409)
Updating files:  92% (1305/1409)
Updating files:  93% (1311/1409)
Updating files:  94% (1325/1409)
Updating files:  95% (1339/1409)
Updating files:  96% (1353/1409)
Updating files:  97% (1367/1409)
Updating files:  98% (1381/1409)
Updating files:  99% (1395/1409)
Updating files: 100% (1409/1409)
Updating files: 100% (1409/1409), done.
[INFO] validating manifest of git repo https://github.com/Aaqib-kk/Asynchronous_Rust on toolchain 8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Aaqib-kk/Asynchronous_Rust
[INFO] finished tweaking git repo https://github.com/Aaqib-kk/Asynchronous_Rust
[INFO] tweaked toml for git repo https://github.com/Aaqib-kk/Asynchronous_Rust written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/Aaqib-kk/Asynchronous_Rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "fetch" "--locked" "--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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded async-task v1.3.1
[INFO] [stderr]   Downloaded async-std v1.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0206b9a1e5fca017486bb01924abb567d5cf689cadf1fff09f9a9bbe4ab174b5
[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" "0206b9a1e5fca017486bb01924abb567d5cf689cadf1fff09f9a9bbe4ab174b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0206b9a1e5fca017486bb01924abb567d5cf689cadf1fff09f9a9bbe4ab174b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0206b9a1e5fca017486bb01924abb567d5cf689cadf1fff09f9a9bbe4ab174b5", kill_on_drop: false }`
[INFO] [stdout] 0206b9a1e5fca017486bb01924abb567d5cf689cadf1fff09f9a9bbe4ab174b5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0c829e46e7d4808c12530d2d910aa2dad18733d451a7dc54d420a23f9ae401b1
[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" "0c829e46e7d4808c12530d2d910aa2dad18733d451a7dc54d420a23f9ae401b1", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.10
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]     Checking futures-io v0.3.4
[INFO] [stderr]     Checking pin-project-lite v0.1.4
[INFO] [stderr]     Checking once_cell v1.3.1
[INFO] [stderr]    Compiling memoffset v0.5.4
[INFO] [stderr]     Checking log v0.4.8
[INFO] [stderr]     Checking net2 v0.2.34
[INFO] [stderr]     Checking async-task v1.3.1
[INFO] [stderr]     Checking crossbeam-channel v0.4.2
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking kv-log-macro v1.0.4
[INFO] [stderr]     Checking crossbeam-epoch v0.8.2
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking async-std v1.5.0
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]     Checking async_1 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]    --> src/main.rs:166:5
[INFO] [stdout]     |
[INFO] [stdout] 166 | use std::thread;
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f1`
[INFO] [stdout]    --> src/main.rs:200:9
[INFO] [stdout]     |
[INFO] [stdout] 200 |     let f1 = learn_song().await;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_f1`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f2`
[INFO] [stdout]    --> src/main.rs:201:9
[INFO] [stdout]     |
[INFO] [stdout] 201 |     let f2 = sing_song().await;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_f2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]    --> src/main.rs:166:5
[INFO] [stdout]     |
[INFO] [stdout] 166 | use std::thread;
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f1`
[INFO] [stdout]    --> src/main.rs:200:9
[INFO] [stdout]     |
[INFO] [stdout] 200 |     let f1 = learn_song().await;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_f1`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f2`
[INFO] [stdout]    --> src/main.rs:201:9
[INFO] [stdout]     |
[INFO] [stdout] 201 |     let f2 = sing_song().await;
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_f2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 34.64s
[INFO] running `Command { std: "docker" "inspect" "0c829e46e7d4808c12530d2d910aa2dad18733d451a7dc54d420a23f9ae401b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c829e46e7d4808c12530d2d910aa2dad18733d451a7dc54d420a23f9ae401b1", kill_on_drop: false }`
[INFO] [stdout] 0c829e46e7d4808c12530d2d910aa2dad18733d451a7dc54d420a23f9ae401b1