[INFO] cloning repository https://github.com/FredrikMeyer/tiny_compiler_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/FredrikMeyer/tiny_compiler_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFredrikMeyer%2Ftiny_compiler_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFredrikMeyer%2Ftiny_compiler_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fd93446854a34cc72a0fc1388e416f048d02c194
[INFO] checking FredrikMeyer/tiny_compiler_rust against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFredrikMeyer%2Ftiny_compiler_rust" "/workspace/builds/worker-37/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-37/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/FredrikMeyer/tiny_compiler_rust on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/FredrikMeyer/tiny_compiler_rust
[INFO] finished tweaking git repo https://github.com/FredrikMeyer/tiny_compiler_rust
[INFO] tweaked toml for git repo https://github.com/FredrikMeyer/tiny_compiler_rust written to /workspace/builds/worker-37/source/Cargo.toml
[INFO] crate git repo https://github.com/FredrikMeyer/tiny_compiler_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "fetch" "--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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bdb9106adf801ed8307df6d6a407c1d665efd9b5cc2e53fcef832f467149ed04
[INFO] running `Command { std: "docker" "start" "-a" "bdb9106adf801ed8307df6d6a407c1d665efd9b5cc2e53fcef832f467149ed04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bdb9106adf801ed8307df6d6a407c1d665efd9b5cc2e53fcef832f467149ed04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bdb9106adf801ed8307df6d6a407c1d665efd9b5cc2e53fcef832f467149ed04", kill_on_drop: false }`
[INFO] [stdout] bdb9106adf801ed8307df6d6a407c1d665efd9b5cc2e53fcef832f467149ed04
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7188e30d38b936fe78cca3eee46dc29b814f6388f19e573640f6f242f1dfe824
[INFO] running `Command { std: "docker" "start" "-a" "7188e30d38b936fe78cca3eee46dc29b814f6388f19e573640f6f242f1dfe824", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rust_compiler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `BufWriter`, `Write`
[INFO] [stdout]  --> src/main.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 |     io::{stdin, BufRead, BufWriter, Write},
[INFO] [stdout]   |                          ^^^^^^^^^  ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BufWriter`, `Write`
[INFO] [stdout]  --> src/main.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 |     io::{stdin, BufRead, BufWriter, Write},
[INFO] [stdout]   |                          ^^^^^^^^^  ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:8:23
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn read_from_stdin<R>(mut reader: R) -> String
[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: associated function is never used: `abort`
[INFO] [stdout]   --> src/tokenizer.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 |     fn abort(&self, _message: String) {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:8:23
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn read_from_stdin<R>(mut reader: R) -> String
[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] [stdout] warning: associated function is never used: `abort`
[INFO] [stdout]   --> src/tokenizer.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 |     fn abort(&self, _message: String) {}
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` 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 6.84s
[INFO] running `Command { std: "docker" "inspect" "7188e30d38b936fe78cca3eee46dc29b814f6388f19e573640f6f242f1dfe824", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7188e30d38b936fe78cca3eee46dc29b814f6388f19e573640f6f242f1dfe824", kill_on_drop: false }`
[INFO] [stdout] 7188e30d38b936fe78cca3eee46dc29b814f6388f19e573640f6f242f1dfe824