[INFO] updating cached repository https://github.com/augustt198/json-rs
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/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] 53f09b4fe8ed5cc8a91acf614f2284f974933502
[INFO] testing augustt198/json-rs against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Faugustt198%2Fjson-rs" "work/builds/worker-4/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/augustt198/json-rs on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[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 work/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 `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 12fedb11d8bbc22735863e88fdcbfc2aff6889214951034cd468b233c77ee649
[INFO] running `"docker" "start" "-a" "12fedb11d8bbc22735863e88fdcbfc2aff6889214951034cd468b233c77ee649"`
[INFO] [stderr]    Compiling json v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(core, collections)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/lib.rs:91:35
[INFO] [stderr]    |
[INFO] [stderr] 91 |             else if c == '"'    { try!(self.next_str_token()) }
[INFO] [stderr]    |                                   ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/lib.rs:92:35
[INFO] [stderr]    |
[INFO] [stderr] 92 |             else if is_alpha(c) { try!(self.next_ident_token(c)) }
[INFO] [stderr]    |                                   ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/lib.rs:93:35
[INFO] [stderr]    |
[INFO] [stderr] 93 |             else if is_digit(c) { try!(self.next_num_token(c)) }
[INFO] [stderr]    |                                   ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:239:25
[INFO] [stderr]     |
[INFO] [stderr] 239 |             let token = try!(lex.next_token());
[INFO] [stderr]     |                         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:298:34
[INFO] [stderr]     |
[INFO] [stderr] 298 |                         vec.push(try!(self.parse()));
[INFO] [stderr]     |                                  ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:341:39
[INFO] [stderr]     |
[INFO] [stderr] 341 |                         map.insert(s, try!(self.parse()));
[INFO] [stderr]     |                                       ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:406:26
[INFO] [stderr]     |
[INFO] [stderr] 406 |         let mut parser = try!(Parser::new(&mut lexer));
[INFO] [stderr]     |                          ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]    --> src/lib.rs:414:23
[INFO] [stderr]     |
[INFO] [stderr] 414 |             let tok = try!(lexer.next_token());
[INFO] [stderr]     |                       ^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `as_slice` found for type `std::string::String` in the current scope
[INFO] [stderr]   --> src/lib.rs:32:30
[INFO] [stderr]    |
[INFO] [stderr] 32 |             Some(self.source.as_slice().char_at(self.pos))
[INFO] [stderr]    |                              ^^^^^^^^ method not found in `std::string::String`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `as_slice` found for type `std::string::String` in the current scope
[INFO] [stderr]    --> src/lib.rs:159:29
[INFO] [stderr]     |
[INFO] [stderr] 159 |         let ident_str = res.as_slice();
[INFO] [stderr]     |                             ^^^^^^^^ method not found in `std::string::String`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `as_slice` found for type `std::string::String` in the current scope
[INFO] [stderr]    --> src/lib.rs:189:27
[INFO] [stderr]     |
[INFO] [stderr] 189 |         let num_str = res.as_slice();
[INFO] [stderr]     |                           ^^^^^^^^ method not found in `std::string::String`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `json`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "12fedb11d8bbc22735863e88fdcbfc2aff6889214951034cd468b233c77ee649"`
[INFO] running `"docker" "rm" "-f" "12fedb11d8bbc22735863e88fdcbfc2aff6889214951034cd468b233c77ee649"`
[INFO] [stdout] 12fedb11d8bbc22735863e88fdcbfc2aff6889214951034cd468b233c77ee649