[INFO] fetching crate parse-regex 0.0.1...
[INFO] testing parse-regex-0.0.1 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate parse-regex 0.0.1 into /workspace/builds/worker-34/source
[INFO] validating manifest of crates.io crate parse-regex 0.0.1 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate parse-regex 0.0.1
[INFO] finished tweaking crates.io crate parse-regex 0.0.1
[INFO] tweaked toml for crates.io crate parse-regex 0.0.1 written to /workspace/builds/worker-34/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 938bbfbd9024c4aeac50d91ec81fb89f6b4fe43d52de717c32e9f011ea18e8ea
[INFO] running `Command { std: "docker" "start" "-a" "938bbfbd9024c4aeac50d91ec81fb89f6b4fe43d52de717c32e9f011ea18e8ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "938bbfbd9024c4aeac50d91ec81fb89f6b4fe43d52de717c32e9f011ea18e8ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "938bbfbd9024c4aeac50d91ec81fb89f6b4fe43d52de717c32e9f011ea18e8ea", kill_on_drop: false }`
[INFO] [stdout] 938bbfbd9024c4aeac50d91ec81fb89f6b4fe43d52de717c32e9f011ea18e8ea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-34/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e0e6c6b789dfcd162a4c733b43afaaa1dae615017562985bc5c30eef4c5b2d5b
[INFO] running `Command { std: "docker" "start" "-a" "e0e6c6b789dfcd162a4c733b43afaaa1dae615017562985bc5c30eef4c5b2d5b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling parse-regex 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(collections)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/parser.rs:26:18
[INFO] [stdout]    |
[INFO] [stdout] 26 |         let t1 = try!(self.term());
[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/parser.rs:29:22
[INFO] [stdout]    |
[INFO] [stdout] 29 |             let t2 = try!(self.term());
[INFO] [stdout]    |                      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/parser.rs:39:21
[INFO] [stdout]    |
[INFO] [stdout] 39 |             let f = try!(self.factor());
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/parser.rs:46:17
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let b = try!(self.base());
[INFO] [stdout]    |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/parser.rs:58:21
[INFO] [stdout]    |
[INFO] [stdout] 58 |             let r = try!(self.regex());
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for struct `String` in the current scope
[INFO] [stdout]   --> src/parser.rs:68:16
[INFO] [stdout]    |
[INFO] [stdout] 68 |         self.s.char_at(self.pos)
[INFO] [stdout]    |                ^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 5 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 `parse-regex` due to 3 previous errors; 5 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "e0e6c6b789dfcd162a4c733b43afaaa1dae615017562985bc5c30eef4c5b2d5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0e6c6b789dfcd162a4c733b43afaaa1dae615017562985bc5c30eef4c5b2d5b", kill_on_drop: false }`
[INFO] [stdout] e0e6c6b789dfcd162a4c733b43afaaa1dae615017562985bc5c30eef4c5b2d5b
