[INFO] fetching crate compiler_builtins 0.1.52...
[INFO] checking compiler_builtins-0.1.52 against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] extracting crate compiler_builtins 0.1.52 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate compiler_builtins 0.1.52 on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate compiler_builtins 0.1.52
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate compiler_builtins 0.1.52
[INFO] tweaked toml for crates.io crate compiler_builtins 0.1.52 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate compiler_builtins 0.1.52 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 46d993badb6f4a258d52875572b82f8fa313ba1efb5f89c37873f8d6101d709b
[INFO] running `Command { std: "docker" "start" "-a" "46d993badb6f4a258d52875572b82f8fa313ba1efb5f89c37873f8d6101d709b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "46d993badb6f4a258d52875572b82f8fa313ba1efb5f89c37873f8d6101d709b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46d993badb6f4a258d52875572b82f8fa313ba1efb5f89c37873f8d6101d709b", kill_on_drop: false }`
[INFO] [stdout] 46d993badb6f4a258d52875572b82f8fa313ba1efb5f89c37873f8d6101d709b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1b70f6ea0c057d7e9be8897a24a2904cb83b8bc1189e7cdd0e3ae923d77cda7a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1b70f6ea0c057d7e9be8897a24a2904cb83b8bc1189e7cdd0e3ae923d77cda7a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling compiler_builtins v0.1.52 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0259]: the name `core` is defined multiple times
[INFO] [stdout]   --> src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | extern crate core;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^ `core` reimported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `core` must be defined only once in the type namespace of this module
[INFO] [stdout] help: you can use `as` to change the binding name of the import
[INFO] [stdout]    |
[INFO] [stdout] 33 | extern crate core as other_core;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: an associated function with this name may be added to the standard library in the future
[INFO] [stdout]  --> src/float/pow.rs:8:19
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut pow = i32::abs_diff(b, 0);
[INFO] [stdout]   |                   ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]   = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]   = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]   = help: call with fully qualified syntax `Int::abs_diff(...)` to keep using the current method
[INFO] [stdout]   = help: add `#![feature(int_abs_diff)]` to the crate attributes to enable `num::<impl i32>::abs_diff`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0259`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `compiler_builtins` due to 2 previous errors; 1 warning emitted
[INFO] [stdout] warning: an associated function with this name may be added to the standard library in the future
[INFO] [stdout]  --> src/float/pow.rs:8:19
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let mut pow = i32::abs_diff(b, 0);
[INFO] [stdout]   |                   ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]   = warning: once this associated item is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]   = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]   = help: call with fully qualified syntax `Int::abs_diff(...)` to keep using the current method
[INFO] [stdout]   = help: add `#![feature(int_abs_diff)]` to the crate attributes to enable `num::<impl i32>::abs_diff`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "1b70f6ea0c057d7e9be8897a24a2904cb83b8bc1189e7cdd0e3ae923d77cda7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1b70f6ea0c057d7e9be8897a24a2904cb83b8bc1189e7cdd0e3ae923d77cda7a", kill_on_drop: false }`
[INFO] [stdout] 1b70f6ea0c057d7e9be8897a24a2904cb83b8bc1189e7cdd0e3ae923d77cda7a