[INFO] crate slice-fill 1.0.1 is already in cache
[INFO] testing slice-fill-1.0.1 against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274
[INFO] extracting crate slice-fill 1.0.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate slice-fill 1.0.1 on toolchain 28742a1146f10a4f09369baad027a464acb7a766
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate slice-fill 1.0.1
[INFO] finished tweaking crates.io crate slice-fill 1.0.1
[INFO] tweaked toml for crates.io crate slice-fill 1.0.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+28742a1146f10a4f09369baad027a464acb7a766" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 714a68aed3299916e56982144f238d1a0c4dc44827254b17a950a3eba2c7bf66
[INFO] running `"docker" "start" "-a" "714a68aed3299916e56982144f238d1a0c4dc44827254b17a950a3eba2c7bf66"`
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling slice-fill v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.55s
[INFO] running `"docker" "inspect" "714a68aed3299916e56982144f238d1a0c4dc44827254b17a950a3eba2c7bf66"`
[INFO] running `"docker" "rm" "-f" "714a68aed3299916e56982144f238d1a0c4dc44827254b17a950a3eba2c7bf66"`
[INFO] [stdout] 714a68aed3299916e56982144f238d1a0c4dc44827254b17a950a3eba2c7bf66
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+28742a1146f10a4f09369baad027a464acb7a766" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] d925d5399273a27a0339ced85242edd45b3b27550ad347b73fd1e91915317089
[INFO] running `"docker" "start" "-a" "d925d5399273a27a0339ced85242edd45b3b27550ad347b73fd1e91915317089"`
[INFO] [stderr]    Compiling slice-fill v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] error: a method with this name may be added to the standard library in the future
[INFO] [stderr]   --> src/lib.rs:57:13
[INFO] [stderr]    |
[INFO] [stderr] 57 |         buf.fill(1);
[INFO] [stderr]    |             ^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: the lint level is defined here
[INFO] [stderr]   --> src/lib.rs:34:24
[INFO] [stderr]    |
[INFO] [stderr] 34 | #![forbid(unsafe_code, future_incompatible, rust_2018_idioms)]
[INFO] [stderr]    |                        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    = note: `#[forbid(unstable_name_collisions)]` implied by `#[forbid(future_incompatible)]`
[INFO] [stderr]    = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stderr]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stderr]    = help: call with fully qualified syntax `SliceExt::fill(...)` to keep using the current method
[INFO] [stderr]    = help: add `#![feature(slice_fill)]` to the crate attributes to enable `core::slice::<impl [T]>::fill`
[INFO] [stderr] 
[INFO] [stderr] error: a method with this name may be added to the standard library in the future
[INFO] [stderr]   --> src/lib.rs:65:20
[INFO] [stderr]    |
[INFO] [stderr] 65 |         buf[0..10].fill(1);
[INFO] [stderr]    |                    ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stderr]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stderr]    = help: call with fully qualified syntax `SliceExt::fill(...)` to keep using the current method
[INFO] [stderr]    = help: add `#![feature(slice_fill)]` to the crate attributes to enable `core::slice::<impl [T]>::fill`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `slice-fill`.
[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" "d925d5399273a27a0339ced85242edd45b3b27550ad347b73fd1e91915317089"`
[INFO] running `"docker" "rm" "-f" "d925d5399273a27a0339ced85242edd45b3b27550ad347b73fd1e91915317089"`
[INFO] [stdout] d925d5399273a27a0339ced85242edd45b3b27550ad347b73fd1e91915317089