[INFO] fetching crate roundqueue 0.2.9...
[INFO] checking roundqueue-0.2.9 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate roundqueue 0.2.9 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate roundqueue 0.2.9 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate roundqueue 0.2.9
[INFO] finished tweaking crates.io crate roundqueue 0.2.9
[INFO] tweaked toml for crates.io crate roundqueue 0.2.9 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate roundqueue 0.2.9 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded git-version v0.3.4
[INFO] [stderr]   Downloaded procfs v0.8.1
[INFO] [stderr]   Downloaded git-version-macro v0.3.4
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[INFO] [stderr]   Downloaded shared_child v0.3.4
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[INFO] [stderr]   Downloaded unix-daemonize v0.1.2
[INFO] [stderr]   Downloaded notify v4.0.15
[INFO] [stderr]   Downloaded rle-decode-fast v1.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 97eccc7b6930146e8a59a735f7f6edf7c0e3b1faafbd0bbd79aed1e4b5683e6b
[INFO] running `Command { std: "docker" "start" "-a" "97eccc7b6930146e8a59a735f7f6edf7c0e3b1faafbd0bbd79aed1e4b5683e6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "97eccc7b6930146e8a59a735f7f6edf7c0e3b1faafbd0bbd79aed1e4b5683e6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "97eccc7b6930146e8a59a735f7f6edf7c0e3b1faafbd0bbd79aed1e4b5683e6b", kill_on_drop: false }`
[INFO] [stdout] 97eccc7b6930146e8a59a735f7f6edf7c0e3b1faafbd0bbd79aed1e4b5683e6b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9cba5a642e1d252a8097ba242b175acaefad0261909c027894fba62e478e8872
[INFO] running `Command { std: "docker" "start" "-a" "9cba5a642e1d252a8097ba242b175acaefad0261909c027894fba62e478e8872", kill_on_drop: false }`
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[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling serde v1.0.123
[INFO] [stderr]    Compiling serde_derive v1.0.123
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking lazycell v1.3.0
[INFO] [stderr]    Compiling serde_json v1.0.62
[INFO] [stderr]     Checking libflate_lz77 v1.0.0
[INFO] [stderr]     Checking rle-decode-fast v1.0.1
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking libflate v1.0.3
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[INFO] [stderr]     Checking net2 v0.2.37
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[INFO] [stderr]    Compiling git-version-macro v0.3.4
[INFO] [stderr]     Checking git-version v0.3.4
[INFO] [stderr]     Checking roundqueue v0.2.9 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]  --> src/longthreads.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std;
[INFO] [stdout]   |     ^^^ the item `std` is already imported by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `std` is imported redundantly
[INFO] [stdout]  --> src/longthreads.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std;
[INFO] [stdout]   |     ^^^ the item `std` is already imported by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over a `Result`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/lib.rs:366:21
[INFO] [stdout]     |
[INFO] [stdout] 366 |         for node in std::fs::read_dir(my_homedir.join(RQ)) {
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 366 |         while let Ok(node) = std::fs::read_dir(my_homedir.join(RQ)) {
[INFO] [stdout]     |         ~~~~~~~~~~~~~    ~~~
[INFO] [stdout] help: consider unwrapping the `Result` with `?` to iterate over its contents
[INFO] [stdout]     |
[INFO] [stdout] 366 |         for node in std::fs::read_dir(my_homedir.join(RQ))? {
[INFO] [stdout]     |                                                           +
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 366 |         if let Ok(node) = std::fs::read_dir(my_homedir.join(RQ)) {
[INFO] [stdout]     |         ~~~~~~~~~~    ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over a `Result`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/lib.rs:366:21
[INFO] [stdout]     |
[INFO] [stdout] 366 |         for node in std::fs::read_dir(my_homedir.join(RQ)) {
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]     |
[INFO] [stdout] 366 |         while let Ok(node) = std::fs::read_dir(my_homedir.join(RQ)) {
[INFO] [stdout]     |         ~~~~~~~~~~~~~    ~~~
[INFO] [stdout] help: consider unwrapping the `Result` with `?` to iterate over its contents
[INFO] [stdout]     |
[INFO] [stdout] 366 |         for node in std::fs::read_dir(my_homedir.join(RQ))? {
[INFO] [stdout]     |                                                           +
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 366 |         if let Ok(node) = std::fs::read_dir(my_homedir.join(RQ)) {
[INFO] [stdout]     |         ~~~~~~~~~~    ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `add_file` and `expect_file` are never used
[INFO] [stdout]   --> tests/lib.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 6  | impl TempDir {
[INFO] [stdout]    | ------------ methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 57 |     fn add_file(&self, p: &str, contents: &[u8]) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 62 |     fn expect_file(&self, p: &str, contents: &[u8]) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.44s
[INFO] running `Command { std: "docker" "inspect" "9cba5a642e1d252a8097ba242b175acaefad0261909c027894fba62e478e8872", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9cba5a642e1d252a8097ba242b175acaefad0261909c027894fba62e478e8872", kill_on_drop: false }`
[INFO] [stdout] 9cba5a642e1d252a8097ba242b175acaefad0261909c027894fba62e478e8872