[INFO] updating cached repository https://github.com/sombrastudios/substr
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 88e9f0d2ae20e0e0cc736831ee95241dacf97e82
[INFO] testing sombrastudios/substr against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsombrastudios%2Fsubstr" "/workspace/builds/worker-3/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sombrastudios/substr on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/sombrastudios/substr
[INFO] finished tweaking git repo https://github.com/sombrastudios/substr
[INFO] tweaked toml for git repo https://github.com/sombrastudios/substr written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/sombrastudios/substr already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=warn" "-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" "+beta-2020-06-03" "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] 1c1bf101e22febd00690f346b51272fab065ceff677d7c99d5a24ebac10654a7
[INFO] running `"docker" "start" "-a" "1c1bf101e22febd00690f346b51272fab065ceff677d7c99d5a24ebac10654a7"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling substr v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: expected one of `.`, `?`, `]`, or an operator, found `,`
[INFO] [stderr]   --> src/main.rs:33:18
[INFO] [stderr]    |
[INFO] [stderr] 32 |             ["-s", index, rest..] => self.with_start(index.parse().expect("expect number after -s flag")).from_args(rest)
[INFO] [stderr]    |                                   -- while parsing the `match` arm starting here
[INFO] [stderr] 33 |             ["-e", index, rest..] => self.with_end(index.parse().expect("expect number after -e flag")).from_args(rest)
[INFO] [stderr]    |                  ^ expected one of `.`, `?`, `]`, or an operator
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: half-open range patterns are unstable
[INFO] [stderr]   --> src/main.rs:32:27
[INFO] [stderr]    |
[INFO] [stderr] 32 |             ["-s", index, rest..] => self.with_start(index.parse().expect("expect number after -s flag")).from_args(rest)
[INFO] [stderr]    |                           ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0658`.
[INFO] [stderr] error: could not compile `substr`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1c1bf101e22febd00690f346b51272fab065ceff677d7c99d5a24ebac10654a7"`
[INFO] running `"docker" "rm" "-f" "1c1bf101e22febd00690f346b51272fab065ceff677d7c99d5a24ebac10654a7"`
[INFO] [stdout] 1c1bf101e22febd00690f346b51272fab065ceff677d7c99d5a24ebac10654a7