[INFO] updating cached repository https://github.com/motecshine/hello_world
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 287eca7f17b361b21acdadabc051f55b80dc578f
[INFO] checking motecshine/hello_world against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmotecshine%2Fhello_world" "work/builds/worker-7/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/motecshine/hello_world on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/motecshine/hello_world
[INFO] finished tweaking git repo https://github.com/motecshine/hello_world
[INFO] tweaked toml for git repo https://github.com/motecshine/hello_world written to work/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/motecshine/hello_world already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 11ee3116dc1c94821e59a0104710c7f532f05aaa160e92fc20a6309e25b7e47d
[INFO] running `"docker" "start" "-a" "11ee3116dc1c94821e59a0104710c7f532f05aaa160e92fc20a6309e25b7e47d"`
[INFO] [stderr]    Compiling syn v0.15.38
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_chacha v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.16
[INFO] [stderr]    Compiling proc-macro-hack v0.5.7
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking futures-executor-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking futures-preview v0.3.0-alpha.16
[INFO] [stderr]     Checking learnrust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `self`
[INFO] [stderr]  --> src/fut/async_await_macro.rs:3:23
[INFO] [stderr]   |
[INFO] [stderr] 3 | use futures::future::{self, FutureExt};
[INFO] [stderr]   |                       ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Poll`, `try_join`
[INFO] [stderr]  --> src/fut/async_await_macro.rs:6:44
[INFO] [stderr]   |
[INFO] [stderr] 6 | use futures::{join, pending, poll, select, try_join, Poll};
[INFO] [stderr]   |                                            ^^^^^^^^  ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self`
[INFO] [stderr]  --> src/fut/async_await_macro.rs:3:23
[INFO] [stderr]   |
[INFO] [stderr] 3 | use futures::future::{self, FutureExt};
[INFO] [stderr]   |                       ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Poll`, `try_join`
[INFO] [stderr]  --> src/fut/async_await_macro.rs:6:44
[INFO] [stderr]   |
[INFO] [stderr] 6 | use futures::{join, pending, poll, select, try_join, Poll};
[INFO] [stderr]   |                                            ^^^^^^^^  ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(async_await)]
[INFO] [stderr]   |            ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `async_await` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(async_await)]
[INFO] [stderr]   |            ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 40.21s
[INFO] running `"docker" "inspect" "11ee3116dc1c94821e59a0104710c7f532f05aaa160e92fc20a6309e25b7e47d"`
[INFO] running `"docker" "rm" "-f" "11ee3116dc1c94821e59a0104710c7f532f05aaa160e92fc20a6309e25b7e47d"`
[INFO] [stdout] 11ee3116dc1c94821e59a0104710c7f532f05aaa160e92fc20a6309e25b7e47d