[INFO] cloning repository psFried/roman-numerals-rust
[INFO] running `"git" "clone" "--bare" "git://github.com/psFried/roman-numerals-rust.git" "work/cache/sources/gh/psFried/roman-numerals-rust"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/psFried/roman-numerals-rust'...
[INFO] running `"git" "clone" "work/cache/sources/gh/psFried/roman-numerals-rust" "work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/psFried/roman-numerals-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/psFried/roman-numerals-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/psFried/roman-numerals-rust" "work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/psFried/roman-numerals-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/psFried/roman-numerals-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a5eb19ba0468ee970bf2118998631a74df84ab43
[INFO] sha for GitHub repo psFried/roman-numerals-rust: a5eb19ba0468ee970bf2118998631a74df84ab43
[INFO] validating manifest of psFried/roman-numerals-rust on toolchain master#9f06855064ed06a50c496577b21ca50f92a2e67d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of psFried/roman-numerals-rust on toolchain try#d3301713b54af69ca9de941a8c6b0d8287dbd6df
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing psFried/roman-numerals-rust
[INFO] finished frobbing psFried/roman-numerals-rust
[INFO] frobbed toml for psFried/roman-numerals-rust written to work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/psFried/roman-numerals-rust/Cargo.toml
[INFO] started frobbing psFried/roman-numerals-rust
[INFO] finished frobbing psFried/roman-numerals-rust
[INFO] frobbed toml for psFried/roman-numerals-rust written to work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/psFried/roman-numerals-rust/Cargo.toml
[INFO] crate psFried/roman-numerals-rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking psFried/roman-numerals-rust against try#d3301713b54af69ca9de941a8c6b0d8287dbd6df for pr-61874
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61874/worker-3/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/psFried/roman-numerals-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] a7d85b6c726d305f1b357b3d0536cd5148eb10b5f6342137f30487bad32f88fe
[INFO] running `"docker" "start" "-a" "a7d85b6c726d305f1b357b3d0536cd5148eb10b5f6342137f30487bad32f88fe"`
[INFO] [stderr]     Checking roman v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0425]: cannot find function `set_exit_status` in module `std::env`
[INFO] [stderr]   --> src/main.rs:27:15
[INFO] [stderr]    |
[INFO] [stderr] 27 |     std::env::set_exit_status(1);
[INFO] [stderr]    |               ^^^^^^^^^^^^^^^ not found in `std::env`
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'slice_concat_ext': trait should not have to exist
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::slice::SliceConcatExt;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: for more information, see https://github.com/rust-lang/rust/issues/27747
[INFO] [stderr]   = help: add #![feature(slice_concat_ext)] to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error: Could not compile `roman`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0425]: cannot find function `set_exit_status` in module `std::env`
[INFO] [stderr]   --> src/main.rs:27:15
[INFO] [stderr]    |
[INFO] [stderr] 27 |     std::env::set_exit_status(1);
[INFO] [stderr]    |               ^^^^^^^^^^^^^^^ not found in `std::env`
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'slice_concat_ext': trait should not have to exist
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::slice::SliceConcatExt;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: for more information, see https://github.com/rust-lang/rust/issues/27747
[INFO] [stderr]   = help: add #![feature(slice_concat_ext)] to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error: Could not compile `roman`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "a7d85b6c726d305f1b357b3d0536cd5148eb10b5f6342137f30487bad32f88fe"`
[INFO] running `"docker" "rm" "-f" "a7d85b6c726d305f1b357b3d0536cd5148eb10b5f6342137f30487bad32f88fe"`
[INFO] [stdout] a7d85b6c726d305f1b357b3d0536cd5148eb10b5f6342137f30487bad32f88fe