[INFO] cloning repository https://github.com/miquerinus/rustlearn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/miquerinus/rustlearn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmiquerinus%2Frustlearn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmiquerinus%2Frustlearn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 75a6efbbbc359bb1acdd9a2b54077eb49d8fc5f5
[INFO] testing miquerinus/rustlearn against 1.99.0-beta.8+cargoflags=--release for beta-release-1.100-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmiquerinus%2Frustlearn" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/miquerinus/rustlearn
[INFO] finished tweaking git repo https://github.com/miquerinus/rustlearn
[INFO] tweaked toml for git repo https://github.com/miquerinus/rustlearn written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/miquerinus/rustlearn on toolchain 1.99.0-beta.8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/miquerinus/rustlearn already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] b935a99bb4111638fb2cd55fcf0d5dca0a10ba9222aeb2fc85bf298e6b88d086
[INFO] running `Command { std: "docker" "start" "b935a99bb4111638fb2cd55fcf0d5dca0a10ba9222aeb2fc85bf298e6b88d086", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b935a99bb4111638fb2cd55fcf0d5dca0a10ba9222aeb2fc85bf298e6b88d086", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "b935a99bb4111638fb2cd55fcf0d5dca0a10ba9222aeb2fc85bf298e6b88d086" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b935a99bb4111638fb2cd55fcf0d5dca0a10ba9222aeb2fc85bf298e6b88d086", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "b935a99bb4111638fb2cd55fcf0d5dca0a10ba9222aeb2fc85bf298e6b88d086" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.8" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling proj02 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::prelude::*`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `flush` found for struct `Stdout` in the current scope
[INFO] [stdout]  --> src/main.rs:8:18
[INFO] [stdout]   |
[INFO] [stdout] 8 |     io::stdout().flush().unwrap();
[INFO] [stdout]   |                  ^^^^^ method not found in `Stdout`
[INFO] [stdout]   |
[INFO] [stdout]  --> /rustc/dfb0accb7f508ae8be965d8629557221c889dd98/library/core/src/io/write.rs:178:7
[INFO] [stdout]   |
[INFO] [stdout]   = note: the method is available for `Stdout` here
[INFO] [stdout]   |
[INFO] [stdout]   = help: items from traits can only be used if the trait is in scope
[INFO] [stdout] help: trait `Write` which provides `flush` is implemented but not in scope; perhaps you want to import it
[INFO] [stdout]   |
[INFO] [stdout] 1 + use std::io::Write;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `read` found for struct `Stdin` in the current scope
[INFO] [stdout]  --> src/main.rs:9:17
[INFO] [stdout]   |
[INFO] [stdout] 9 |     io::stdin().read(&mut[0u8]).unwrap();
[INFO] [stdout]   |                 ^^^^ method not found in `Stdin`
[INFO] [stdout]   |
[INFO] [stdout]  --> /rustc/dfb0accb7f508ae8be965d8629557221c889dd98/library/alloc/src/io/read.rs:167:7
[INFO] [stdout]   |
[INFO] [stdout]   = note: the method is available for `Stdin` here
[INFO] [stdout]   |
[INFO] [stdout]   = help: items from traits can only be used if the trait is in scope
[INFO] [stdout] help: trait `Read` which provides `read` is implemented but not in scope; perhaps you want to import it
[INFO] [stdout]   |
[INFO] [stdout] 1 + use std::io::Read;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proj02` (bin "proj02") due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "b935a99bb4111638fb2cd55fcf0d5dca0a10ba9222aeb2fc85bf298e6b88d086", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b935a99bb4111638fb2cd55fcf0d5dca0a10ba9222aeb2fc85bf298e6b88d086", kill_on_drop: false }`
[INFO] [stdout] b935a99bb4111638fb2cd55fcf0d5dca0a10ba9222aeb2fc85bf298e6b88d086
