[INFO] fetching crate study13 0.1.0...
[INFO] checking study13-0.1.0 against try#c659ee110de67e82444e4b6c8407c1a9af9c2cf6 for pr-145608-1
[INFO] extracting crate study13 0.1.0 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate study13 0.1.0
[INFO] finished tweaking crates.io crate study13 0.1.0
[INFO] tweaked toml for crates.io crate study13 0.1.0 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate study13 0.1.0 on toolchain c659ee110de67e82444e4b6c8407c1a9af9c2cf6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate study13 0.1.0 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" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 23da983764ac661a94871efbea72ecbfae0f325c1e6c04fc238d75825474d55b
[INFO] running `Command { std: "docker" "start" "-a" "23da983764ac661a94871efbea72ecbfae0f325c1e6c04fc238d75825474d55b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "23da983764ac661a94871efbea72ecbfae0f325c1e6c04fc238d75825474d55b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23da983764ac661a94871efbea72ecbfae0f325c1e6c04fc238d75825474d55b", kill_on_drop: false }`
[INFO] [stdout] 23da983764ac661a94871efbea72ecbfae0f325c1e6c04fc238d75825474d55b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eda309017af72039fa2afbcdd5d4343b5e5f8b662a581870e0b63005bf947c8a
[INFO] running `Command { std: "docker" "start" "-a" "eda309017af72039fa2afbcdd5d4343b5e5f8b662a581870e0b63005bf947c8a", kill_on_drop: false }`
[INFO] [stderr]     Checking study13 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `v2`
[INFO] [stdout]    --> src/main.rs:105:13
[INFO] [stdout]     |
[INFO] [stdout] 105 |         let v2: Vec<_> = v1.iter().map(|x| x+1).collect();
[INFO] [stdout]     |             ^^ help: if this is intentional, prefix it with an underscore: `_v2`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `simu` is never used
[INFO] [stdout]  --> src/main.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn simu(i:u32) -> u32 {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]   --> src/main.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | struct Cacher<T>
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]   --> src/main.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | / impl<T> Cacher<T>
[INFO] [stdout] 45 | |     where T: Fn(u32)->u32
[INFO] [stdout]    | |_________________________- associated items in this implementation
[INFO] [stdout] 46 |   {
[INFO] [stdout] 47 |       fn new(cal:T)->Cacher<T>{
[INFO] [stdout]    |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 54 |       fn value(&mut self,arg:u32)->u32{
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `simu` is never used
[INFO] [stdout]  --> src/main.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn simu(i:u32) -> u32 {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Cacher` is never constructed
[INFO] [stdout]   --> src/main.rs:37:8
[INFO] [stdout]    |
[INFO] [stdout] 37 | struct Cacher<T>
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `value` are never used
[INFO] [stdout]   --> src/main.rs:47:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | / impl<T> Cacher<T>
[INFO] [stdout] 45 | |     where T: Fn(u32)->u32
[INFO] [stdout]    | |_________________________- associated items in this implementation
[INFO] [stdout] 46 |   {
[INFO] [stdout] 47 |       fn new(cal:T)->Cacher<T>{
[INFO] [stdout]    |          ^^^
[INFO] [stdout] ...
[INFO] [stdout] 54 |       fn value(&mut self,arg:u32)->u32{
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Counter` is never constructed
[INFO] [stdout]   --> src/main.rs:68:8
[INFO] [stdout]    |
[INFO] [stdout] 68 | struct Counter {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/main.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 72 | impl Counter {
[INFO] [stdout]    | ------------ associated function in this implementation
[INFO] [stdout] 73 |     fn new() -> Counter {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.23s
[INFO] running `Command { std: "docker" "inspect" "eda309017af72039fa2afbcdd5d4343b5e5f8b662a581870e0b63005bf947c8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eda309017af72039fa2afbcdd5d4343b5e5f8b662a581870e0b63005bf947c8a", kill_on_drop: false }`
[INFO] [stdout] eda309017af72039fa2afbcdd5d4343b5e5f8b662a581870e0b63005bf947c8a