[INFO] cloning repository https://github.com/iamwwc/rustquiz
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iamwwc/rustquiz" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiamwwc%2Frustquiz", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiamwwc%2Frustquiz'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7231596c6a1240f407e427d34bfd1daf1ae8f6db
[INFO] building iamwwc/rustquiz against master#881c1ac408d93bb7adaa3a51dabab9266e82eee8 for issue-85264
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiamwwc%2Frustquiz" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iamwwc/rustquiz on toolchain 881c1ac408d93bb7adaa3a51dabab9266e82eee8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/iamwwc/rustquiz
[INFO] finished tweaking git repo https://github.com/iamwwc/rustquiz
[INFO] tweaked toml for git repo https://github.com/iamwwc/rustquiz written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/iamwwc/rustquiz already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mio v0.7.5
[INFO] [stderr]   Downloaded socket2 v0.3.15
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 958a97e7029fb850079ac3bef8b95b52d09395c55119f1296e296fe143010999
[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" "958a97e7029fb850079ac3bef8b95b52d09395c55119f1296e296fe143010999", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "958a97e7029fb850079ac3bef8b95b52d09395c55119f1296e296fe143010999", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "958a97e7029fb850079ac3bef8b95b52d09395c55119f1296e296fe143010999", kill_on_drop: false }`
[INFO] [stdout] 958a97e7029fb850079ac3bef8b95b52d09395c55119f1296e296fe143010999
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+881c1ac408d93bb7adaa3a51dabab9266e82eee8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5d25f5859481eead5afd7fb46d39875d9ddf50e31bcad3c07a56c2862186adb8
[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" "5d25f5859481eead5afd7fb46d39875d9ddf50e31bcad3c07a56c2862186adb8", kill_on_drop: false }`
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling mio v0.7.5
[INFO] [stderr]    Compiling rand v0.5.6
[INFO] [stderr]    Compiling rustquiz v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/bin/struct.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let t = Token(1024);
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/bin/struct.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let a = 1;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Write`
[INFO] [stdout]  --> src/bin/file.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{Write, Read};
[INFO] [stdout]   |               ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/bin/file.rs:14:59
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut f = File::open("./plain.txt").unwrap_or_else(|e| {
[INFO] [stdout]    |                                                           ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/bin/file.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let s = f.read_to_string(&mut buffer)?;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]  --> src/bin/file.rs:8:27
[INFO] [stdout]   |
[INFO] [stdout] 8 |          Err(e) => panic!(e),
[INFO] [stdout]   |                           ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]   = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]   |
[INFO] [stdout] 8 |          Err(e) => panic!("{}", e),
[INFO] [stdout]   |                           ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]   |
[INFO] [stdout] 8 |          Err(e) => std::panic::panic_any(e),
[INFO] [stdout]   |                    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/file.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     fs::write(path,"hahaha");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/bin/rustlang/main.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let mut secret_number = rand::thread_rng().gen_range(1, 101);
[INFO] [stdout]   |         ----^^^^^^^^^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/bin/eventloop/main.rs:31:22
[INFO] [stdout]    |
[INFO] [stdout] 31 |     fn register() -> io::Result<()> {
[INFO] [stdout]    |        --------      ^^^^^^^^^^^^^^ expected enum `Result`, found `()`
[INFO] [stdout]    |        |
[INFO] [stdout]    |        implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `Result<(), std::io::Error>`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/bin/eventloop/main.rs:35:24
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn unregister() -> io::Result<()> {
[INFO] [stdout]    |        ----------      ^^^^^^^^^^^^^^ expected enum `Result`, found `()`
[INFO] [stdout]    |        |
[INFO] [stdout]    |        implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `Result<(), std::io::Error>`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/bin/eventloop/main.rs:38:20
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn select() -> io::Result<()> {
[INFO] [stdout]    |        ------      ^^^^^^^^^^^^^^ expected enum `Result`, found `()`
[INFO] [stdout]    |        |
[INFO] [stdout]    |        implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `Result<(), std::io::Error>`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustquiz`
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "5d25f5859481eead5afd7fb46d39875d9ddf50e31bcad3c07a56c2862186adb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5d25f5859481eead5afd7fb46d39875d9ddf50e31bcad3c07a56c2862186adb8", kill_on_drop: false }`
[INFO] [stdout] 5d25f5859481eead5afd7fb46d39875d9ddf50e31bcad3c07a56c2862186adb8
