[INFO] cloning repository https://github.com/alexsparrow/rsbf
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alexsparrow/rsbf" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falexsparrow%2Frsbf", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falexsparrow%2Frsbf'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c58ba7534416b4ee9d26a9590cd3802cc736fdd6
[INFO] testing alexsparrow/rsbf against master#8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e for pr-74409
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falexsparrow%2Frsbf" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alexsparrow/rsbf on toolchain 8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/alexsparrow/rsbf
[INFO] finished tweaking git repo https://github.com/alexsparrow/rsbf
[INFO] tweaked toml for git repo https://github.com/alexsparrow/rsbf written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/alexsparrow/rsbf already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "metadata" "--no-deps" "--format-version=1", 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] 0806e989b3075838efaae2a7fb5a5bca81b9f8f8c84322d3ce410da2b9d157bb
[INFO] running `Command { std: "docker" "start" "-a" "0806e989b3075838efaae2a7fb5a5bca81b9f8f8c84322d3ce410da2b9d157bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0806e989b3075838efaae2a7fb5a5bca81b9f8f8c84322d3ce410da2b9d157bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0806e989b3075838efaae2a7fb5a5bca81b9f8f8c84322d3ce410da2b9d157bb", kill_on_drop: false }`
[INFO] [stdout] 0806e989b3075838efaae2a7fb5a5bca81b9f8f8c84322d3ce410da2b9d157bb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=forbid" "-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@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a03b534b880232b686a8a96ceea9f903b9487e65be0b3cd951e4fc954d12dbe4
[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" "a03b534b880232b686a8a96ceea9f903b9487e65be0b3cd951e4fc954d12dbe4", kill_on_drop: false }`
[INFO] [stderr]    Compiling rsbf v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:40:42
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn output(state: &mut State, write: &mut Write) {
[INFO] [stdout]    |                                          ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lib.rs:72:57
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub fn interpret(s:&str, state: &mut State, write: &mut Write) {
[INFO] [stdout]    |                                                         ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/lib.rs:50:21
[INFO] [stdout]    |
[INFO] [stdout] 50 |             if code.char_at(state.pc) == ']' {
[INFO] [stdout]    |                     ^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/lib.rs:74:19
[INFO] [stdout]    |
[INFO] [stdout] 74 |         let c = s.char_at(state.pc);
[INFO] [stdout]    |                   ^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rsbf`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "a03b534b880232b686a8a96ceea9f903b9487e65be0b3cd951e4fc954d12dbe4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a03b534b880232b686a8a96ceea9f903b9487e65be0b3cd951e4fc954d12dbe4", kill_on_drop: false }`
[INFO] [stdout] a03b534b880232b686a8a96ceea9f903b9487e65be0b3cd951e4fc954d12dbe4