Oct 12 15:25:53.106 INFO checking qingxiang-jia/learn-rust against try#4021bd0b3c5815b087d6db10ce461e7e4854ade7 for pr-54977
Oct 12 15:25:53.106 INFO running `"docker" "create" "-v" "/mnt/big/crater/./work/local/target-dirs/pr-54977/worker-7/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/target:rw,Z" "-v" "/mnt/big/crater/./work/local/test-source/worker-7/pr-54977/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/source:ro,Z" "-v" "/mnt/big/crater/./work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/./work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +4021bd0b3c5815b087d6db10ce461e7e4854ade7-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Oct 12 15:25:53.300 INFO blam! c5cfdd26247dadc4c63c1bdfcdc0e52535695916ccf56de92b730ac5b0a8bbc0
Oct 12 15:25:53.305 INFO running `"docker" "start" "-a" "c5cfdd26247dadc4c63c1bdfcdc0e52535695916ccf56de92b730ac5b0a8bbc0"`
Oct 12 15:25:54.402 INFO kablam! usermod: no changes
Oct 12 15:25:54.499 INFO kablam!    Compiling proc-macro2 v0.3.3
Oct 12 15:25:57.839 INFO kablam!    Compiling quote v0.5.1
Oct 12 15:25:59.357 INFO kablam!    Compiling syn v0.13.1
Oct 12 15:26:08.488 INFO kablam!    Compiling serde_derive_internals v0.23.0
Oct 12 15:26:13.111 INFO kablam!    Compiling serde_derive v1.0.37
Oct 12 15:26:24.289 INFO kablam!     Checking learn_rust v0.1.0 (/source)
Oct 12 15:26:25.486 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 31.05s
Oct 12 15:26:25.492 INFO kablam! su: No module specific data is present
Oct 12 15:26:26.844 INFO running `"docker" "rm" "-f" "c5cfdd26247dadc4c63c1bdfcdc0e52535695916ccf56de92b730ac5b0a8bbc0"`
Oct 12 15:26:27.148 INFO blam! c5cfdd26247dadc4c63c1bdfcdc0e52535695916ccf56de92b730ac5b0a8bbc0