[INFO] crate compiler_builtins 0.1.26 is already in cache
[INFO] checking compiler_builtins-0.1.26 against master#3dbade652ed8ebac70f903e01f51cd92c4e4302c for pr-69741
[INFO] extracting crate compiler_builtins 0.1.26 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate compiler_builtins 0.1.26 on toolchain 3dbade652ed8ebac70f903e01f51cd92c4e4302c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate compiler_builtins 0.1.26
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate compiler_builtins 0.1.26
[INFO] tweaked toml for crates.io crate compiler_builtins 0.1.26 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate compiler_builtins 0.1.26 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "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] 4b2777b4d6377974799f468d8c1f129fe68eaee21836214959ae06ff55994804
[INFO] running `"docker" "start" "-a" "4b2777b4d6377974799f468d8c1f129fe68eaee21836214959ae06ff55994804"`
[INFO] [stderr]    Compiling compiler_builtins v0.1.26 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0259]: the name `core` is defined multiple times
[INFO] [stderr]   --> src/lib.rs:31:1
[INFO] [stderr]    |
[INFO] [stderr] 31 | 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] 31 | 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] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4b2777b4d6377974799f468d8c1f129fe68eaee21836214959ae06ff55994804"`
[INFO] running `"docker" "rm" "-f" "4b2777b4d6377974799f468d8c1f129fe68eaee21836214959ae06ff55994804"`
[INFO] [stdout] 4b2777b4d6377974799f468d8c1f129fe68eaee21836214959ae06ff55994804