[INFO] cloning repository https://github.com/timglabisch/rust_read_stdin_benchmark
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/timglabisch/rust_read_stdin_benchmark" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimglabisch%2Frust_read_stdin_benchmark", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimglabisch%2Frust_read_stdin_benchmark'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0413bf50024e73fe466034dc1b8aebd31698d54e
[INFO] checking timglabisch/rust_read_stdin_benchmark against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftimglabisch%2Frust_read_stdin_benchmark" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/timglabisch/rust_read_stdin_benchmark on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/timglabisch/rust_read_stdin_benchmark
[INFO] finished tweaking git repo https://github.com/timglabisch/rust_read_stdin_benchmark
[INFO] tweaked toml for git repo https://github.com/timglabisch/rust_read_stdin_benchmark written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/timglabisch/rust_read_stdin_benchmark already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 16fcc332b73f9252dbf49fb21217754a72fbc8077734d364a99539da86c04478
[INFO] running `Command { std: "docker" "start" "-a" "16fcc332b73f9252dbf49fb21217754a72fbc8077734d364a99539da86c04478", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "16fcc332b73f9252dbf49fb21217754a72fbc8077734d364a99539da86c04478", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "16fcc332b73f9252dbf49fb21217754a72fbc8077734d364a99539da86c04478", kill_on_drop: false }`
[INFO] [stdout] 16fcc332b73f9252dbf49fb21217754a72fbc8077734d364a99539da86c04478
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2444156b117c0ace20586e0c03ea546cfd46e7a15678e2c2e9b269ea5c4b3e7a
[INFO] running `Command { std: "docker" "start" "-a" "2444156b117c0ace20586e0c03ea546cfd46e7a15678e2c2e9b269ea5c4b3e7a", kill_on_drop: false }`
[INFO] [stderr]     Checking bytereader v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/bin/slow_consumer.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let row = Row {
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/bin/consumer.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]   --> src/bin/consumer.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::io::Read;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row`
[INFO] [stdout]   --> src/bin/slow_consumer.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |         let row = Row {
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_row`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/bin/consumer.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Read`
[INFO] [stdout]   --> src/bin/consumer.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::io::Read;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/consumer.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let mut a = std::io::stdin();
[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] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/consumer.rs:80:9
[INFO] [stdout]    |
[INFO] [stdout] 80 |     let mut a = std::io::stdin();
[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] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.91s
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "2444156b117c0ace20586e0c03ea546cfd46e7a15678e2c2e9b269ea5c4b3e7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2444156b117c0ace20586e0c03ea546cfd46e7a15678e2c2e9b269ea5c4b3e7a", kill_on_drop: false }`
[INFO] [stdout] 2444156b117c0ace20586e0c03ea546cfd46e7a15678e2c2e9b269ea5c4b3e7a