[INFO] crate compiler_builtins 0.1.21 is already in cache
[INFO] checking compiler_builtins-0.1.21 against try#d27c6c6a469a28343396a8f3ac1c9d403aabda69 for pr-66037
[INFO] extracting crate compiler_builtins 0.1.21 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate compiler_builtins 0.1.21 on toolchain d27c6c6a469a28343396a8f3ac1c9d403aabda69
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d27c6c6a469a28343396a8f3ac1c9d403aabda69" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate compiler_builtins 0.1.21
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate compiler_builtins 0.1.21
[INFO] tweaked toml for crates.io crate compiler_builtins 0.1.21 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate compiler_builtins 0.1.21 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d27c6c6a469a28343396a8f3ac1c9d403aabda69" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "MAP_USER_ID=0" "-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" "+d27c6c6a469a28343396a8f3ac1c9d403aabda69" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2ecf74643f7ceb05b987ccdd6726c84610af2d532dea23d4a13868ca0f077158
[INFO] running `"docker" "start" "-a" "2ecf74643f7ceb05b987ccdd6726c84610af2d532dea23d4a13868ca0f077158"`
[INFO] [stderr]    Compiling compiler_builtins v0.1.21 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0259]: the name `core` is defined multiple times
[INFO] [stderr]   --> src/lib.rs:30:1
[INFO] [stderr]    |
[INFO] [stderr] 30 | extern crate core;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^ `core` reimported here
[INFO] [stderr]    |
[INFO] [stderr]    = note: `core` must be defined only once in the type namespace of this module
[INFO] [stderr] help: you can use `as` to change the binding name of the import
[INFO] [stderr]    |
[INFO] [stderr] 30 | extern crate core as other_core;
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0259`.
[INFO] [stderr] error: could not compile `compiler_builtins`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "2ecf74643f7ceb05b987ccdd6726c84610af2d532dea23d4a13868ca0f077158"`
[INFO] running `"docker" "rm" "-f" "2ecf74643f7ceb05b987ccdd6726c84610af2d532dea23d4a13868ca0f077158"`
[INFO] [stdout] 2ecf74643f7ceb05b987ccdd6726c84610af2d532dea23d4a13868ca0f077158