[INFO] cloning repository https://github.com/augustt198/json-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/augustt198/json-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faugustt198%2Fjson-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faugustt198%2Fjson-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 53f09b4fe8ed5cc8a91acf614f2284f974933502
[INFO] testing augustt198/json-rs against beta-2021-01-01 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faugustt198%2Fjson-rs" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/augustt198/json-rs on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/augustt198/json-rs
[INFO] finished tweaking git repo https://github.com/augustt198/json-rs
[INFO] tweaked toml for git repo https://github.com/augustt198/json-rs written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/augustt198/json-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] afa28fe0dad64bd60e97bc3095e1d45c6af9196992ec70dace3eb7c48b58afed
[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" "afa28fe0dad64bd60e97bc3095e1d45c6af9196992ec70dace3eb7c48b58afed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "afa28fe0dad64bd60e97bc3095e1d45c6af9196992ec70dace3eb7c48b58afed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "afa28fe0dad64bd60e97bc3095e1d45c6af9196992ec70dace3eb7c48b58afed", kill_on_drop: false }`
[INFO] [stdout] afa28fe0dad64bd60e97bc3095e1d45c6af9196992ec70dace3eb7c48b58afed
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", 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] de7dfc9c5e5026f4b576cf6e58367bd5944ceaa4994dc255129b64713176032e
[INFO] running `Command { std: "docker" "start" "-a" "de7dfc9c5e5026f4b576cf6e58367bd5944ceaa4994dc255129b64713176032e", kill_on_drop: false }`
[INFO] [stderr]    Compiling json v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core, collections)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:91:35
[INFO] [stdout]    |
[INFO] [stdout] 91 |             else if c == '"'    { try!(self.next_str_token()) }
[INFO] [stdout]    |                                   ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:92:35
[INFO] [stdout]    |
[INFO] [stdout] 92 |             else if is_alpha(c) { try!(self.next_ident_token(c)) }
[INFO] [stdout]    |                                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/lib.rs:93:35
[INFO] [stdout]    |
[INFO] [stdout] 93 |             else if is_digit(c) { try!(self.next_num_token(c)) }
[INFO] [stdout]    |                                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:239:25
[INFO] [stdout]     |
[INFO] [stdout] 239 |             let token = try!(lex.next_token());
[INFO] [stdout]     |                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:298:34
[INFO] [stdout]     |
[INFO] [stdout] 298 |                         vec.push(try!(self.parse()));
[INFO] [stdout]     |                                  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:341:39
[INFO] [stdout]     |
[INFO] [stdout] 341 |                         map.insert(s, try!(self.parse()));
[INFO] [stdout]     |                                       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:406:26
[INFO] [stdout]     |
[INFO] [stdout] 406 |         let mut parser = try!(Parser::new(&mut lexer));
[INFO] [stdout]     |                          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/lib.rs:414:23
[INFO] [stdout]     |
[INFO] [stdout] 414 |             let tok = try!(lexer.next_token());
[INFO] [stdout]     |                       ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/lib.rs:32:30
[INFO] [stdout]    |
[INFO] [stdout] 32 |             Some(self.source.as_slice().char_at(self.pos))
[INFO] [stdout]    |                              ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]    --> src/lib.rs:159:29
[INFO] [stdout]     |
[INFO] [stdout] 159 |         let ident_str = res.as_slice();
[INFO] [stdout]     |                             ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `as_slice` found for struct `String` in the current scope
[INFO] [stdout]    --> src/lib.rs:189:27
[INFO] [stdout]     |
[INFO] [stdout] 189 |         let num_str = res.as_slice();
[INFO] [stdout]     |                           ^^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors; 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `json`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "de7dfc9c5e5026f4b576cf6e58367bd5944ceaa4994dc255129b64713176032e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de7dfc9c5e5026f4b576cf6e58367bd5944ceaa4994dc255129b64713176032e", kill_on_drop: false }`
[INFO] [stdout] de7dfc9c5e5026f4b576cf6e58367bd5944ceaa4994dc255129b64713176032e