[INFO] fetching crate iterators_closures 0.1.0...
[INFO] checking iterators_closures-0.1.0 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate iterators_closures 0.1.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate iterators_closures 0.1.0
[INFO] finished tweaking crates.io crate iterators_closures 0.1.0
[INFO] tweaked toml for crates.io crate iterators_closures 0.1.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate iterators_closures 0.1.0 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate iterators_closures 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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6fc29ec70c4bd1821fb5fc8b9a98aba25ee1f5004f59fd9f8b810d1b92d3cd21
[INFO] running `Command { std: "docker" "start" "-a" "6fc29ec70c4bd1821fb5fc8b9a98aba25ee1f5004f59fd9f8b810d1b92d3cd21", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6fc29ec70c4bd1821fb5fc8b9a98aba25ee1f5004f59fd9f8b810d1b92d3cd21", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fc29ec70c4bd1821fb5fc8b9a98aba25ee1f5004f59fd9f8b810d1b92d3cd21", kill_on_drop: false }`
[INFO] [stdout] 6fc29ec70c4bd1821fb5fc8b9a98aba25ee1f5004f59fd9f8b810d1b92d3cd21
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9a412b2cdb4f2a8db2672466f9b7c0901ec43ac055f619401483306a1263df8a
[INFO] running `Command { std: "docker" "start" "-a" "9a412b2cdb4f2a8db2672466f9b7c0901ec43ac055f619401483306a1263df8a", kill_on_drop: false }`
[INFO] [stderr]     Checking iterators_closures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/iterators.rs:29:13
[INFO] [stdout]    |
[INFO] [stdout] 29 |         let mut v1_iter = v2;
[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/iterators.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let mut v3:Vec<_> =v1.iter().map(|x| x + 1).collect();
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Shoe` is never constructed
[INFO] [stdout]  --> src/iterators.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Shoe{
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `shoes_in_size` is never used
[INFO] [stdout]   --> src/iterators.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn shoes_in_size<'a>(shoes:&'a Vec<Shoe>,size:f32)->Vec<&'a Shoe>{
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::thread;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::thread;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.41s
[INFO] running `Command { std: "docker" "inspect" "9a412b2cdb4f2a8db2672466f9b7c0901ec43ac055f619401483306a1263df8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a412b2cdb4f2a8db2672466f9b7c0901ec43ac055f619401483306a1263df8a", kill_on_drop: false }`
[INFO] [stdout] 9a412b2cdb4f2a8db2672466f9b7c0901ec43ac055f619401483306a1263df8a